eric, i can only comment in a limited way and only based on what i have read. the lower end cisco products (like the 2500's i've been deploying in remote offices) can only associate one virtual mac address to an interface and so can only belong to a single hsrp group. if you have a need to support more than one hsrp group on an interface one way around that limitation it is to use the bia of the interface as the virtual address and to issue a gratuitous arp whenever the interface takes over - the command is "standby use-bia" i recall. higher end products don't have the limitation and some end stations don't really respond well to it.
i haven't actually used this before for money, so there is the possibility of being wrong and your mileage may vary will use. but it should start the ball rolling to hear from others. cheers. garrett ----- Original Message ----- From: ericbrouwers Date: Tuesday, March 18, 2003 1:24 am Subject: Gratuitous ARP and HSRP [7:65633] > Hello all, > > I've read in the CCNP Switching Exam Cert. Guide that a standby > router that > becomes active in an HSRP group, sends a gratuitous ARP to update > the ARP > cache of the end stations with the new active MAC address... > > This is strange, since the same virtual MAC address is used by > active and > standby HSRP routers. > > However, maybe Cisco's implementation has once been like this, > because I've > seen instances in the field that ARP caches contained the real MAC > instead of > the virtual MAC address when using HSRP. > > Can someone give comments on this? > > Thanks, > > Eric Brouwers > [EMAIL PROTECTED] > Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=65673&t=65633 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
