RE: Bridging Question? [7:60546]
A router might be configured to do bridging to support a number of applications or problems: The IP addressing may have been designed as one big subnet, instead of multiple subnets. Non-routable protocols such as NetBIOS (NetBEUI) or DEC's Local Area Transport (LAT) might be running on the network. The company might have an IBM legacy. IBM traditionally focused on bridging for Token Ring and SNA environments. There might be some other application that actually depends on broadcasts getting forwarded, and broadcast radiation might not be considered a problem due to low volume. Bridging might be considered simpler. There's no need for a routing protocol. There's no need to configure a default gateway on the hosts. Priscilla mlehr wrote: I have studied for and successfully tested CCNA CCNP and now I am studying for the CCIE written exam. At this point in my studies, I am reading up on the subject of Bridging. I fully understand the concept of bridging when it comes to switches, but I am perplexed as to why a router would need to perform a bridging function. Obviously bridging capabilities are built into the routers IOS but what need would prompted anyone to use this feature. In the other studies Bridging was not a covered subject so this is new territory for me. Help! Mike L. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=60548t=60546 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Bridging Question? [7:60546]
Mike, Well, we have an ATM PVC into the public cloud where the ISP later converts it to Frame, and on our 2600 we take the frame circuit bridge it... here's a snippet of the configs::: frame-router# FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Bridging Question? [7:60546]
I take it, 3 consecutive dots [one per line] does something to ixnay the remainder of an email?? -Original Message- From: COULOMBE, TROY Sent: Tuesday, January 07, 2003 5:52 PM To: 'mlehr'; [EMAIL PROTECTED] Subject: RE: Bridging Question? [7:60546] Mike, Well, we have an ATM PVC into the public cloud where the ISP later converts it to Frame, and on our 2600 we take the frame circuit bridge it... here's a snippet of the configs::: frame-router# interface Serial0/0 description Frame Relay to datacenter no ip address ip directed-broadcast encapsulation frame-relay IETF no ip mroute-cache no fair-queue ! interface Serial0/0.1 point-to-point frame-relay interface-dlci 41 IETF bridge-group 1 interface BVI1 ip address xxx.xxx.125.33 255.255.255.248 and on the ATM interface [in a 6509]::: interface ATM0 atm preferred phy A atm uni-version 4.0 atm pvc 125 2 41 aal5snap atm bind pvc vlan 125 125 no atm auto-configuration atm ilmi-keepalive no atm address-registration -Original Message- From: mlehr [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 07, 2003 5:11 PM To: [EMAIL PROTECTED] Subject: Bridging Question? [7:60546] I have studied for and successfully tested CCNA CCNP and now I am studying for the CCIE written exam. At this point in my studies, I am reading up on the subject of Bridging. I fully understand the concept of bridging when it comes to switches, but I am perplexed as to why a router would need to perform a bridging function. Obviously bridging capabilities are built into the routers IOS but what need would prompted anyone to use this feature. In the other studies Bridging was not a covered subject so this is new territory for me. Help! Mike L. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=60558t=60546 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Bridging Question? [7:60546]
mlehr wrote: I have studied for and successfully tested CCNA CCNP and now I am studying for the CCIE written exam. At this point in my studies, I am reading up on the subject of Bridging. I fully understand the concept of bridging when it comes to switches, but I am perplexed as to why a router would need to perform a bridging function. Obviously bridging capabilities are built into the routers IOS but what need would prompted anyone to use this feature. In the other studies Bridging was not a covered subject so this is new territory for me. Just to give you a specific example that builds on Priscilla's reply: This past summer I had a client who had hired me to do the WAN stuff for an international network and another contractor to install some telephone switches. The switches were to be managed via an out-of-band IP network. The folks back at the factory had configured every one of the switch management IPs to be in the same subnet. Problem was, no one could figure out how to change the IPs in the field and extensive documentation and training material had already been produced. So I saved the day by eliminating the static routes and setting up a bridge group (don't ask how the change in router configs affected the documentation -- I didn't ask and no one fessed up). So it's sometimes an unintentional patch. What's more, even if they had done this on purpose, I don't think Cisco sells bridges anymore. So a router with a bridge group still would have been required. Help! Mike L. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=60559t=60546 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Bridging Question? [7:60546]
good points, Scott. Down there at the end I've added a couple of my own experiences in the real world. s vermill wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... mlehr wrote: I have studied for and successfully tested CCNA CCNP and now I am studying for the CCIE written exam. At this point in my studies, I am reading up on the subject of Bridging. I fully understand the concept of bridging when it comes to switches, but I am perplexed as to why a router would need to perform a bridging function. Obviously bridging capabilities are built into the routers IOS but what need would prompted anyone to use this feature. In the other studies Bridging was not a covered subject so this is new territory for me. Just to give you a specific example that builds on Priscilla's reply: This past summer I had a client who had hired me to do the WAN stuff for an international network and another contractor to install some telephone switches. The switches were to be managed via an out-of-band IP network. The folks back at the factory had configured every one of the switch management IPs to be in the same subnet. Problem was, no one could figure out how to change the IPs in the field and extensive documentation and training material had already been produced. So I saved the day by eliminating the static routes and setting up a bridge group (don't ask how the change in router configs affected the documentation -- I didn't ask and no one fessed up). So it's sometimes an unintentional patch. What's more, even if they had done this on purpose, I don't think Cisco sells bridges anymore. So a router with a bridge group still would have been required. two real world situations. In my days at The Brokerage Firm, we were an IPX network. Our quote vendor did not route IPX from their quote servers. I had a small branch office thrust upon me ( a single broker and his sales assistant ) It was not cost effective to provide them with their own quote server, so I bridged to that site so they could share the home office quote server. The cost benefit analysis gave me a payback in a relatively short time. these days, I sell a number of small office RLAN's ( DSL at the remote, ATM at the central site ) In a network where there are only 10 people in the central site and 3-5 people in the remote sites, it is not worth my trouble to route. People use static IP's and generaly use their ISP for company e-mail. So I bridge a network like this. The data flow supposrts this, and since the operations are not very sophisticated, and the customers generally without a lot of cash for sophisitcated servers and services, it works out well. ( Yes there is a firewall in place at the central site ) Help! Mike L. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=60562t=60546 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
