Help on VLAN configuration [7:8127]
Hi All, The scenario is such that I have 2 subnets configured on the LAN. They are x.x.1.0 / 24 and x.x.2.0 / 24. The IP address for the Routers ethernet port are x.x.1.1 and x.x.2.1. Similarly workstations in either subnet point to these addresses ( x.x.1.1 and x.x.2.1 ) as their default gateways. I am having Cat 5509 and Cat 6609 ( With MSFC) with all the ports in the default VLAN1 I have the following queries on this : Config on MSFC Can the IP addresses of the vlan interfaces be any one of the free IP address available on the LAN. For eg x.x.1.3 What will be the default gateway address configured on MSFC in this case ? ( Will it point towards the address of the Ethernet interface of the External router ) On the Switches Can both switches be configured in the VTP Server mode ? Do the trunk ports have to have an IP address ? DHCP Server How would I have to define the scopes on the DHCP server. Suppose I plan to have 1 Vlan configured for 1 subnet and 4 VLANs in the second subnet. How to go about it. Thanks in advance for any kind of help/ suggestions __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8127&t=8127 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Help on VLAN configuration [7:8127]
Hello, My replies are in line. But you should include an ASCII topology to give us a better understanding of what you are trying to accomplish. >From: "Amit Gupta" >Reply-To: "Amit Gupta" >To: [EMAIL PROTECTED] >Subject: Help on VLAN configuration [7:8127] >Date: Tue, 12 Jun 2001 05:34:58 -0400 > >Hi All, > >The scenario is such that I have 2 subnets configured >on the LAN. They are x.x.1.0 / 24 and x.x.2.0 / 24. >The IP address for the Routers ethernet port are >x.x.1.1 and x.x.2.1. Similarly workstations in either >subnet point to these addresses ( x.x.1.1 and x.x.2.1 >) as their default gateways. How many routers will you have? one, two. With this two subnets in one router means you'll put them in two different interfaces. If you are going to put this in one ethernet interface, you'll not be able to trunk using ethernet interface. >I am having Cat 5509 and Cat 6609 ( With MSFC) with >all the ports in the default VLAN1 > >I have the following queries on this : >Config on MSFC > >Can the IP addresses of the vlan interfaces be any one >of the free IP address available on the LAN. >For eg x.x.1.3 Yes, you can but the better thing to do is to make the vlan interface be the default gateway for your PCs. For example: Cat5509 ISLCat6509 w/MSFC || | | || | | PC PC PC PC (V1) (V2) (V2) (V1) You'll have two vlan interfaces at the MSFC and the PC's in V1 will have their gateway point to vlan 1 interface of the MSFC and the PC's in V2 will have their gateway point to vlan 2 interface. >What will be the default gateway address configured on >MSFC in this case ? ( Will it point towards the >address of the Ethernet interface of the External >router ) Yes, it will point to the next hop router if that router have all the routes to anything that the MSFC does not know about. ip route 0.0.0.0 0.0.0.0 > >On the Switches > >Can both switches be configured in the VTP Server mode >? Yes, both the switches can be in server mode but they have to be in the same vtp domain. >Do the trunk ports have to have an IP address ? Trunked ports betweeen the 5509 and 6509 are layer2 ports they do not have ip addresses. > >DHCP Server > >How would I have to define the scopes on the DHCP >server. >Suppose I plan to have 1 Vlan configured for 1 subnet >and 4 VLANs in the second subnet. How to go about it. You don't put a subnet in four diffrent vlans that' not the purpose of vlans. VLANs allow you to group ports on a switch to limit unicast, multicast, and broadcast traffic flooding. Flooded traffic originating from a particular VLAN is only flooded out other ports belonging to that VLAN. > >Thanks in advance for any kind of help/ suggestions > > > > >__ >Do You Yahoo!? >Get personalized email addresses from Yahoo! Mail - only $35 >a year! http://personal.mail.yahoo.com/ _ Get your FREE download of MSN Explorer at http://explorer.msn.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8218&t=8127 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Help on VLAN configuration [7:8127]
Comments inline... Let me know if you have any questions. HTH, Karen *** REPLY SEPARATOR *** On 6/12/2001 at 5:34 AM Amit Gupta wrote: >Hi All, > >The scenario is such that I have 2 subnets configured >on the LAN. They are x.x.1.0 / 24 and x.x.2.0 / 24. >The IP address for the Routers ethernet port are >x.x.1.1 and x.x.2.1. Similarly workstations in either >subnet point to these addresses ( x.x.1.1 and x.x.2.1 >) as their default gateways. >I am having Cat 5509 and Cat 6609 ( With MSFC) with >all the ports in the default VLAN1 KY: If all the ports are in VLAN 1 then you effectively have a single network with two subnets, a primary (x.x.1.0) and a secondary (x.x.2.0). If you want to treat it as two networks and do inter-vlan routing then you need to set up a second VLAN. If you don't want to do that then you need to set up a secondary address on the router interface (or MSFC) The command is "ip address x.x.2.1 255.255.255.0 secondary". > >I have the following queries on this : >Config on MSFC > >Can the IP addresses of the vlan interfaces be any one >of the free IP address available on the LAN. >For eg x.x.1.3 KY: Yes. Only the Network address and the broadcast address are off limits. All other unused addresses in the subnet are available for workstations, printers, servers, etc... > >What will be the default gateway address configured on >MSFC in this case ? ( Will it point towards the >address of the Ethernet interface of the External >router ) KY: Remember that a default gateway address is simply where you want the device to send traffic when it doesn't have a more specific route. Ask yourself "Where should my MSFC card sent traffic not meant for any connected VLANs?" If the answer is to the external router, then the default gateway address is the next hop to the router. > >On the Switches > >Can both switches be configured in the VTP Server mode >? KY: Yes. The second server will act as a backup. However, you'll need to keep a close eye on the VTP revision numbers when making changes since that's a really good way to mess up your VLAN structure. The best way to add a new VTP server is to add it as a client until it has the current revision (the current VLAN structure) and then switch it over to server mode. >Do the trunk ports have to have an IP address ? KY: No, on the switch itself (not the MSFC) the only IP address will be on the management interface (sc0). > >DHCP Server > >How would I have to define the scopes on the DHCP >server. >Suppose I plan to have 1 Vlan configured for 1 subnet >and 4 VLANs in the second subnet. How to go about it. > KY: Set up your scopes as if they were regular networks. The DHCP server handles the distribution just fine. Just remember that you'll need to configure IP helper addresses on each VLAN subinterface on the MSFC or router (whichever device is handling inter-vlan routing). One major problem I see here is this "4 VLANs in the second subnet". A VLAN is a regular network that happens to be double-jointed (so to speak). Its more flexible, but its still a regular network. One subnet per network unless you're using a secondary address and only one network per subnet. Thats it. If you want to set up 4 VLANs on the x.x.2.0 subnet then you're going to HAVE to subnet it further into 4 subnets (x.x.2.0, x.x.2.64, x.x.2.128, and x.x.2.192) with associated subinterfaces so that inter-vlan routing can occur. >Thanks in advance for any kind of help/ suggestions > > > > >__ >Do You Yahoo!? >Get personalized email addresses from Yahoo! Mail - only $35 >a year! http://personal.mail.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8248&t=8127 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
