RE: Creating Multiple Interfaces on an Ethernet Port
On Wed, 21 Feb 2001, Tim Lovelace wrote: This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Ok, now try to add an IP address :)) Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying / selling used CISCO gear!! email me for a quote Netjam, LLC http://www.netjam.net Brian Feeny Scarlett Parria [EMAIL PROTECTED] [EMAIL PROTECTED] 318-222-2638 x 109318-222-2638 x 101 Fax 318-221-6612 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
: Creating Multiple Interfaces on an Ethernet Port
Hi, In fact,you can add several subinterface on a physical fastethernet port of a router with these subinterface encapsulated ISL or Dot1q,and give each subinterface a IP address.Many NIC can support 802.1q or ISL,so you can devide the physical NIC to several virtual NIC encapsulated ISL or 802.1q,and give each of them ip address,the defauft gateway ip of the router's subinterface. Johnny Sun -Original Message- ·¢¼þÈË: Kenneth [EMAIL PROTECTED] ÐÂÎÅ×é: groupstudy.cisco ÊÕ¼þÈË: [EMAIL PROTECTED] [EMAIL PROTECTED] ÈÕÆÚ: 2001Äê2ÔÂ22ÈÕ 10:29 Ö÷Ìâ: Re: Creating Multiple Interfaces on an Ethernet Port Oh yeah. Nobody said it's a layer 3 issue. It's obviously an IOS issue since it doesn't make sense why it can't be configured that way. NT servers can have one NIC with multiple IP addresses. Yonkerbonk [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... You can add IPX addresses to it, so it doesn't seem to be an issue of layer 3 addresses. I think it just a matter of Cisco IOS supporting it. Michael --- Kenneth [EMAIL PROTECTED] wrote: try adding an ip address to it. "Tim Lovelace" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices! http://auctions.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
Remember the message I sent last week about the Cisco CLI being inconsistent and somewhat illogical at times? I think that's the issue. With IP we do secondary addresses. With IPX we do subinterfaces. (Correct me if I'm wrong. I'm in a rush.) I'm still a huge Cisco fan, but their CLI needs work. At least we don't have to be C++ programmers to use it, though! ;-) Priscilla At 09:03 PM 2/21/01, Kenneth wrote: Oh yeah. Nobody said it's a layer 3 issue. It's obviously an IOS issue since it doesn't make sense why it can't be configured that way. NT servers can have one NIC with multiple IP addresses. Yonkerbonk [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... You can add IPX addresses to it, so it doesn't seem to be an issue of layer 3 addresses. I think it just a matter of Cisco IOS supporting it. Michael --- Kenneth [EMAIL PROTECTED] wrote: try adding an ip address to it. "Tim Lovelace" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices! http://auctions.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
Oh yeah. Nobody said it's a layer 3 issue. It's obviously an IOS issue since it doesn't make sense why it can't be configured that way. NT servers can have one NIC with multiple IP addresses. Yonkerbonk [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... You can add IPX addresses to it, so it doesn't seem to be an issue of layer 3 addresses. I think it just a matter of Cisco IOS supporting it. Michael --- Kenneth [EMAIL PROTECTED] wrote: try adding an ip address to it. "Tim Lovelace" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices! http://auctions.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
try adding an ip address to it. "Tim Lovelace" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
You can add IPX addresses to it, so it doesn't seem to be an issue of layer 3 addresses. I think it just a matter of Cisco IOS supporting it. Michael --- Kenneth [EMAIL PROTECTED] wrote: try adding an ip address to it. "Tim Lovelace" [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED]... This seems to be incorrect. I tried this on a router I had spare and below are hte results. It may be a newer feature, I am to lazy to look on CCO. Tim Router2#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-I-M), Version 12.0(15), RELEASE SOFTWARE (fc1) Router2#config t Enter configuration commands, one per line. End with CNTL/Z. Router2(config)#int e0/0 Router2(config-if)#int e0/0.1 Router2(config-subif)# 00:01:29: %LINK-3-UPDOWN: Interface Ethernet0/0, changed state to up Router2(config-subif)#^Z Router2#sh run interface Ethernet0/0 ip address 10.10.10.1 255.255.255.128 no ip directed-broadcast ! interface Ethernet0/0.1 no ip directed-broadcast ! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Brian Sent: Monday, February 19, 2001 9:29 PM To: Chris Wornell Cc: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDP f:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - Buy the things you want at great prices! http://auctions.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Creating Multiple Interfaces on an Ethernet Port
I would swear that I read that "secondary" was eventually going away and the sub-interfaces would replace it. Am I dreaming? - Tks | mailto:[EMAIL PROTECTED] BV | mailto:[EMAIL PROTECTED] Sr. Technical Consultant, SBM, A Gates/Arrow Co. Vox 770-623-3430 11455 Lakefield Dr. Fax 770-623-3429 Duluth, GA 30097-1511 = -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Priscilla Oppenheimer Sent: Monday, February 19, 2001 10:33 PM To: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
Adding a secondary IP address won't affect the number of broadcast domains. Secondary IP addressing is a network-layer configuration. Broadcasts are a physical and data-link layer issue. All stations in a LAN hear each others broadcasts because they either share a cable, are connected via hubs which forward all bits, or are connected via switches which forward all broadcasts. Here's an analogy: You live on First Street. One afternoon, instead of cursing at your routers, you take out your frustration by yelling out your window, "Hey neighbors, I think you're all ugly." Now let's say that some of your neighbors decide to rename their side of the street from First Street to Main Street. When you yell out the window, won't they still hear you? Renaming their street would be like giving them IP addresses in a different subnet. Now, who can follow up with a VLAN example??! ;-) Priscilla At 10:48 AM 2/20/01, Tony Chen wrote: Follow up question to the secondary IP address on the ethernet interface: When you add secondary IP address to an ethernet interface, does that create multiple broadcast domains, or still one broadcast domain? Tony Priscilla Oppenheimer [EMAIL PROTECTED] 02/19/01 09:33PM At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] *** This message is a private communication. If you are not the intended recipient, please do not read, copy, or use it, and do not disclose it to others. Please notify the sender of the delivery error by replying to this message, and then delete it from your system. Thank you. - Visit http://www.ballfoundation.org for our latest news. Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Creating Multiple Interfaces on an Ethernet Port
You're not dreaming! Someone replied to my post last week, he/she advised that Cisco will at point stop supporting secondary interfaces. Nabil -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Bob Vance Sent: Tuesday, February 20, 2001 1:21 PM To: CISCO_GroupStudy List (E-mail) Subject: RE: Creating Multiple Interfaces on an Ethernet Port I would swear that I read that "secondary" was eventually going away and the sub-interfaces would replace it. Am I dreaming? - Tks | mailto:[EMAIL PROTECTED] BV | mailto:[EMAIL PROTECTED] Sr. Technical Consultant, SBM, A Gates/Arrow Co. Vox 770-623-3430 11455 Lakefield Dr. Fax 770-623-3429 Duluth, GA 30097-1511 = -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Priscilla Oppenheimer Sent: Monday, February 19, 2001 10:33 PM To: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
You live on First Street. One afternoon, instead of cursing at your routers, you take out your frustration by yelling out your window, "Hey neighbors, I think you're all ugly." Now let's say that some of your neighbors decide to rename their side of the street from First Street to Main Street. When you yell out the window, won't they still hear you? Renaming their street would be like giving them IP addresses in a different subnet. Now, who can follow up with a VLAN example??! ;-) Priscilla Here's a good one for multiple VLANs... Your neighbors get fed up with your insults and in turn, decide to brick up your window. :o Fred From: Priscilla Oppenheimer [EMAIL PROTECTED] Reply-To: Priscilla Oppenheimer [EMAIL PROTECTED] To: "Tony Chen" [EMAIL PROTECTED], [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port Date: Tue, 20 Feb 2001 11:55:36 -0800 Adding a secondary IP address won't affect the number of broadcast domains. Secondary IP addressing is a network-layer configuration. Broadcasts are a physical and data-link layer issue. All stations in a LAN hear each others broadcasts because they either share a cable, are connected via hubs which forward all bits, or are connected via switches which forward all broadcasts. Here's an analogy: You live on First Street. One afternoon, instead of cursing at your routers, you take out your frustration by yelling out your window, "Hey neighbors, I think you're all ugly." Now let's say that some of your neighbors decide to rename their side of the street from First Street to Main Street. When you yell out the window, won't they still hear you? Renaming their street would be like giving them IP addresses in a different subnet. Now, who can follow up with a VLAN example??! ;-) Priscilla At 10:48 AM 2/20/01, Tony Chen wrote: Follow up question to the secondary IP address on the ethernet interface: When you add secondary IP address to an ethernet interface, does that create multiple broadcast domains, or still one broadcast domain? Tony Priscilla Oppenheimer [EMAIL PROTECTED] 02/19/01 09:33PM At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] *** This message is a private communication. If you are not the intended recipient, please do not read, copy, or use it, and do not disclose it to others. Please notify the sender of the delivery error by replying to this message, and then delete it from your system. Thank you. - Visit http://www.ballfoundation.org for our latest news. Priscilla Oppenheimer http://www.priscilla.com
RE: Creating Multiple Interfaces on an Ethernet Port
Personally I think this is not true, I think someone is spreading something with no real data to back it up. Their are physical issues on why some 10bT interfaces on cisco routers can not handle VLAN's. So I doubt secondary addressing will go away just like that. VLANs and secondary addressing each have their place. Brian On Tue, 20 Feb 2001, Nabil Fares wrote: You're not dreaming! Someone replied to my post last week, he/she advised that Cisco will at point stop supporting secondary interfaces. Nabil -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Bob Vance Sent: Tuesday, February 20, 2001 1:21 PM To: CISCO_GroupStudy List (E-mail) Subject: RE: Creating Multiple Interfaces on an Ethernet Port I would swear that I read that "secondary" was eventually going away and the sub-interfaces would replace it. Am I dreaming? - Tks | mailto:[EMAIL PROTECTED] BV | mailto:[EMAIL PROTECTED] Sr. Technical Consultant, SBM, A Gates/Arrow Co. Vox 770-623-3430 11455 Lakefield Dr. Fax 770-623-3429 Duluth, GA 30097-1511 = -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Priscilla Oppenheimer Sent: Monday, February 19, 2001 10:33 PM To: [EMAIL PROTECTED] Subject: Re: Creating Multiple Interfaces on an Ethernet Port At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDPf:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
The only way you can create subinterfaces on fastethernet ports is when you use encapsulation such as dot1q or isl. Otherwise, the router will tell you that you can't. "Chris Wornell" [EMAIL PROTECTED] wrote in message 00a701c09ad6$aee4e850$20c956d8@jabooty">news:00a701c09ad6$aee4e850$20c956d8@jabooty... Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
At 04:47 PM 2/19/01, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. Why do you want to create multiple interfaces on your Ethernet port? Ethernet was designed as a connectionless, packet-switched shared network. Serial links, on the other hand, are more often used for connection-oriented virtual circuits. Subinterfaces let you associate a single physical link with multiple virtual circuits. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Sure there are Ethernet-only networks. Each physical Ethernet port on a router is usually associated with an IP subnet. If you happen to have two IP subnets on the LAN to which a physical port is attached, you could use a secondary IP address as a workaround to this problem. Traffic between subnets would still go through the router usually. If you're using your Ethernet port as a "trunk port," and you use ISL or 802.1q VLAN encapsulation, then you can configure subinterfaces. In this case, subinterfaces let you associate a single physical link with multiple VLANs. Inter-Switch Link (ISL) and IEEE 802.1q maintain VLAN identification information as traffic travels between connected switches. Maybe you can give us a better idea of what you are trying to accomplish and we can provide more tailored information, but I hope this info was somewhat useful. Priscilla Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Creating Multiple Interfaces on an Ethernet Port
the only way you can create sub interfaces on ethernet is to use dot1q or ISL encapsulation on a FastEthernet interface (VLANs) brian On Mon, 19 Feb 2001, Chris Wornell wrote: Hello, I've found out you can't create multiple interfaces on an ethernet port apparently. I was wondering why this is exactly? I know you can accomplish the same on serial lines using pvc's but it seems odd you can't do it on ethernet. I know there are ethernet only networks and the ip secondary command doesn't seem right compared to creating a new interface. Chris Wornell Technical Support MM Internet http://mminternet.com 888-654-4971 CCNA, CCDA, CSE _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- I'm buying used CISCO gear!! email me for a quote Brian Feeny e:[EMAIL PROTECTED] CCNP+Voice/ATM/Security p:318.222.2638x109 CCDPf:318.221.6612 Network Administrator ShreveNet Inc. (ASN 11881) _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
