gratuitous arp and secundary ip addresses

Answered Question
Mar 13th, 2009

When an interface (SVI or routed) comes up, does a Cisco switch or router send a gratuitous arp to update the arp cache of the hosts on that subnet ? I guess yes (?), BUT does he also do this for each secundary address or secundary HSRP active address that is configured on the interface ?

regards,

Geert

I have this problem too.
0 votes
Correct Answer by Richard Burts about 7 years 8 months ago

Geert

I set up a test of this using a pair of 1841 routers with a secondary address configured on a FastEthernet interface. The test shows that when the FastEthernet interface is taken down and brought up that the router does send a gratuitous arp for both the primary address and the secondary address.

HTH

Rick

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 4 (1 ratings)
Loading.
Correct Answer
Richard Burts Fri, 03/13/2009 - 11:30

Geert

I set up a test of this using a pair of 1841 routers with a secondary address configured on a FastEthernet interface. The test shows that when the FastEthernet interface is taken down and brought up that the router does send a gratuitous arp for both the primary address and the secondary address.

HTH

Rick

Actions

This Discussion