Ken Diliberto wrote: > But... (you knew I was going to say that, didn't you...) > > What if you have 2 Cat5K with dual RSM (each) with on RSM > routing for a > VLAN spanning both switches? > RSM 1 on Cat5K 1 routing for VLAN 25 on Cat5K 1 and 2.
The problem with that is that the devices in a specific VLAN are going to be configured to go to a given gateway IP address, and that can only be services by one of the RSMs, so in effect only one RSM can do the routing for a given VLAN. Having said that, you can run HSRP between the two RSMs, so that if one RSM fails, the other will kick in and still route for the VLAN(s). i.e. If you have 10.1.0.0/16 setup in VLAN 2, and you have your clients setup to go to 10.1.0.1 for their gateway, you can only apply that IP (10.1.0.1) to the VLAN 2 interface in one of the RSMs, not both or else you'll get an IP conflict. If you configure interface VLAN 2 on each RSM with 10.1.0.2 and 10.1.0.3 and setup them up for HSRP with a virtual IP of 10.1.0.1, then one of the RSMs will route for that VLAN, and the other will be a redundant backup. I've only run Cat5500s with a single RSM in each, running HSRP, so I can't say 100% for sure, but I think if you have another RSM in each chassis, you could theoretically run HSRP between all four RSMs.... anyone out there verify this? HTH, Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=51877&t=51841 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
