[c-nsp] Does "backup interface" gratuitous ARP?
Sam Stickland
sam at spacething.org
Wed Aug 13 11:44:49 EDT 2014
Hi,
I'm exploring redundancy possibilities for a router hand off without a
dynamic routing protocol. It's ugly and I'm not going to explain all the
details here, but I basically have this configuration on a router:
interface Gi1/1
backup interface Gi1/2
ip address 192.168.1.1 255.255.255.252
interface Gi1/2
ip address 192.168.1.1 255.255.255.252
If interface Gi1/1 goes down will the router send a gratuitous ARP when
interface Gi1/2 comes up? I seem to remember that it's default IOS
behaviour to always send a gratuitous ARP when an interface first comes up.
I don't have test hardware to hand and I can't simulate this in GNS because
ethernet interfaces are permanently up in dynamips.
Regards,
Sam
More information about the cisco-nsp
mailing list