From: heiko.liedtke@lhsystems.com
Date: Wed Feb 22 2006 - 05:05:54 GMT-3
The feature you are asking for is called the gratuitous arp.
As mac-address-tables are built by learning the source mac-addresses
of incoming frames on a switchport, it is neccessary that the new
HSRP active router (Router B) sends a packet with the virtual MAC as the source MAC. Receiving this gratuitous arp frame, the switch can update the mac-address-table and everything should be fine.
-----Urspr|ngliche Nachricht-----
Von: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Im Auftrag von Pranab Bhowmick
Gesendet: Mittwoch, 22. Februar 2006 07:24
An: ccielab@groupstudy.com
Betreff: Virtual MAC in HSRP
I am not very clear as to how the virtual MAC address is updated when the
ACTIVE router goes down while packets are being sent to it. Say a PC client
is sending packets to Router-A which is the currently Active router. Both
Router A and Router B are connected to the same switch. Now when Router-A
goes down, what would trigger the Switch to update its MAC address table to
send packets to the port to which Router-B is connected? Does the PC need to
do another ARP? Can somebody shed some light?
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