You might want to look up the following document on CCO: Avoiding HSRP Instability in a Switching Environment with Various Routing Platforms. Looks like www.cisco.com/warp/public/619/8.shtml
> -----Original Message----- > From: John Starta [mailto:[EMAIL PROTECTED] > Sent: Tuesday, February 25, 2003 1:12 PM > To: [EMAIL PROTECTED] > Subject: HSRP or switch issue? [7:63768] > > > I'm currently experiencing an oddity with multicast traffic > like HSRP that > I'm looking for some ideas on. For simplicity the network > design consists > of 2 Cisco 3640 routers running HSRP between them connected > to a single > Extreme [Black Diamond] switch. Basically... > > extreme switch > | | > | | > rtr1 rtr2 > > Normally everything works just fine, but periodically -- in time, not > quantity -- HSRP indicates via the %HSRP-4-DUPADDR message > that I have a > duplicate [IP] address. (The quantity of the messages indicating the > duplicate IP address ranges from half dozen to nearly a > hundred. The time > between messages closely matches the HSRP HELLO interval.) > > When I receive these messages, on the active HSRP router for > instance, they > indicate the duplicate address as being the physical > interface IP address > of the active HSRP router with the source MAC address as the > virtual MAC > [address] of the active HSRP router. Receipt of these %HSRP-4-DUPADDR > messages indicating the duplicate as itself suggests an issue with > multicast -- a loop of sorts whereby the switch copies the multicast > announcement [back] to the same switch port it originated. > Keep in mind > that there are no interface or HSRP state changes so the > messages probably > aren't coming from the standby HSRP router. (Especially since > the indicated > duplicate IP address is that of the physical interface on the > active HSRP > router, not the virtual IP.) > > I did some poking around on Extreme's web site and they > indicate an issue > with HSRP in an earlier version of code, but that is/was fixed in the > version being used. > > Have anybody run into this before? Ideas regarding cause? I > don't have > access to the switch since it belongs to the customer. > > ., Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=63784&t=63768 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
