OK, I'll take a stab at question 4 and see if that sorts out the others on the way...
I would by no means class myself as an expert on the 8500 series, but here's my understanding of how this should work. In 8500 terminology a bridge group is a switch local broadcast domain. i.e. all ports in bridge group 2 are in the same broadcast domain. Most people would generally consider this the definition of a VLAN, but on the 8500 a VLAN is only present on a trunk - and you map bridge groups to vlans by putting a trunked subinterface into a specific bridge group. e.g. If switch 1 has a bridge group 1 and switch 2 has a bridge group 2. You could join these broadcast domains by running a cable between switch 1 and switch 2, creating a subinterface on each switch port, you then set each subinterface to use the same trunk type and vlan number (e.g. 'encapsulation dot1q 10') You also add these ports to the relevant bridge group. You then have a VLAN 10, which consists of all ports in switch 1 bridge group 1, plus the ports in switch 2 bridge group 2. In your example, you only have one 8500, so you can just consider a bridge group to be identical to a VLAN. To route packets from one bridge group to another you either use IRB, or you have an external router connected to all 3 bridge groups (either on individual ports, or by way of a trunk). Take a look at this CCO link for more details on how to configure this: (mind the wrap) http://www.cisco.com/univercd/cc/td/doc/product/l3sw/8540/rel_12_0/w5_6e/sof tcnfg/4cfg8500.htm Hope this helps. -- Russell Heilling http://www.ccie.org.uk/ ""Chris Watson"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Nortel D5000 core switch is more or less one giant broadcast domain with 3 > subnets and 3 logical collison domains (back in the day you simply divided > the hub into logical port groups to keep the collisions down).All of the > downstream switches are 10bFL uplinks. There are three Nortel 350F switches > that I can connect via Cu. > > We want to replace the D5000 with a Cisco 8510 that has 16 ports of FA and 8 > ports of 100bFL and an E0 on the Sup. I figured out today that I can't get a > VLAN on any of the ports (okay, I can trunk but w/o switches downstream it > does me no good and, no, I didn't buy the box as someone else chose it for > price:rolleyes:). > > 1. Do I need to include all ports in the router as a bridge group to talk to > each other? > 2. Are VLANs an option with an 8510? (So far the answer is no, but that's > one reason why I'm posting) > 3 Do I need IRB to allow all 3+ disparate bridge groups to talk to each > other? > 4. Explain (hopefully better than I did) the difference between a VLAN and a > Bridge Group. > > > I would love to hear any suggestions/ideas/questions you may have for this > replacement. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=54220&t=54217 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
