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I'm Cisco Champion Community member for 2017!

I'm Cisco Champion Community member for 2017!
"Cisco Champions are passionate about Cisco and happy to share our knowledge, experience, and feedback."

понедельник, 31 августа 2015 г.

quick note: standby use-bia

Q. What is the standby use-bia command and how does it work?

A. By default, HSRP uses the preassigned HSRP virtual MAC address <...> In order to configure HSRP to use the burnt-in address of the interface as its virtual MAC address, instead of the default, use the standby use-bia command.

Note: Using the standby use-bia command has these disadvantages:
  • When a router becomes active the virtual IP address is moved to a different MAC address. The newly active router sends a gratuitous ARP response, but not all host implementations handle the gratuitous ARP correctly.
  • Proxy ARP breaks when use-bia is configured. A standby router cannot cover for the lost proxy ARP database of the failed router.


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