Your network may require you to bridge local traffic within several segments while having hosts on the bridged segments reach the hosts or routers on routed networks. For example, if you are migrating bridged topologies into routed topologies, you may want to start by connecting some of the bridged segments to the routed networks. Using the integrated routing and bridging (IRB) feature, you can route a given protocol between routed interfaces and bridge groups within a single switch router. Specifically, local or unroutable traffic will be bridged among the bridged interfaces in the same bridge group, while routable traffic will be routed to other routed interfaces or bridge groups. Because bridging is in the data-link layer (Layer 2) and routing is in the network layer (Layer 3), they have different protocol configuration models. With IP, for example, bridge group interfaces belong to the same network and have a collective IP network address. In contrast, each routed interface represents a distinct network and has its own IP network address. Integrated routing and bridging uses the concept of a Bridge Group Virtual Interface (BVI) to enable these interfaces to exchange packets for a given protocol. A BVI is a virtual interface within the switch router that acts like a normal routed interface. A BVI does not support bridging, but it actually represents the corresponding bridge group to routed interfaces within the switch router. The interface number is the link between the BVI and the bridge group. I hope this helps, for furhter information check this link: http://www.cisco.com/univercd/cc/td/doc/product/l3sw/4908g_l3/ios_12/7w515d/config/bridging.htm#xtocid176215 >From: "Chris Fortune" >Reply-To: "Chris Fortune" >To: [EMAIL PROTECTED] >Subject: Bridging one subnet and routing another over the same interface >[7:7481] >Date: Wed, 6 Jun 2001 23:42:47 -0400 > >I have a situation where I have two 2600 router - one serial and one >ethernet port each, connected together by a T1 point-to-point link that is >doing bridging only today. I am going to be re-numbering their IP network >and setting up routing instead of bridging between the routers. The >problem >I have is that I have some devices that have fixed IP addresses that need >to >be available at either site. I thought of routing the two subnets that do >not need to have fixed IP addresses, and bridge another subnet to contain >the fixed IP address devices. Does anyone have experience with this kind >of >scenario, or can give me some advice on how to proceed? > >Thanks _________________________________________________________________ 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=7567&t=7567 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
