Tim, If you have not hard configured the MAC address then it will be the MAC of the "virtual router". This MAC address is a combination of 3 things; vendor code, well known HSRP virtual MAC address, and the group number of the active router.
Below are listed some sources of information. http://www.cisco.com/warp/public/473/62.shtml#addressing Quote: HSRP Standby IP Address Communication (All Media Except Token Ring) Since host workstations are configured with their default gateway as the HSRP standby IP address, hosts must communicate with the MAC address associated with the HSRP standby IP address. This MAC address will be a virtual MAC address composed of 0000.0c07.ac**, where ** is the HSRP group number in hexadecimal based on the respective interface. For example, HSRP group one will use the HSRP virtual MAC address of 0000.0c07.ac01. Hosts on the adjoining LAN segment use the normal ARP process to resolve the associated MAC addresses. End Quote: Building Cisco Multilayer Switched Networks (chapter 7) MAC - 0000.0c07.ac01 0000.0c - Vendor identifier Cisco 07.ac - Well known HSRP Virtual MAC address 01 - Group address http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/1214ea1/3550scg/swhsrp.htm It is configurable if you need to do so with the following command. standby [group-number] mac-address mac-address or standby use-bia Kim > > From: "Tim Potier" > Date: 2002/06/22 Sat AM 12:17:36 EDT > To: [EMAIL PROTECTED] > Subject: HSRP [7:47177] > > Lets say I have HSRP configured on a series of routers... I know clients are > sending packets to the MAC/IP of the well known "virtual MAC" with Cisco > equipment. Assume the receiving station recieves the packet directly from > the router participating in HSRP with the highest priority... what is the > source MAC the receiving station sees? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47189&t=47177 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
