Group,
Ran across a puzzling HSRP behavior issue today...
I have two 2514s running HSRP on Ethernet 0. When I induce a failure of
Primary router's (Router A) E0 interface, I can use 'debug standby' to
determine that HSRP failover takes place as expected, just after the
holddown expires. The Standby router (Router B) waits three hello
intervals, then changes it's MAC to the virtual HSRP MAC, becoming Active.
This works like textbook, what I did not expect came when I restored
Ethernet 0 on Router A (the one with a higher Standby priority), when this
is done, Router A changes HSRP state from init to listen for one holddown
interval, and begins sending hellos. It receives none from Router B,
although Router B is sending them. Router A then changes state from listen
to standby, continues to send hellos, then changes state to Active, also
changing it's MAC to the HSRP virtual MAC. At this point, Router A
continues sending hellos, recieving none, even though I can verify that
Router B is sending them. Eventually, Router A recieves a hello from Router
B, indicating a resignation. Good. Router A is now officially the active
HSRP router and begins forwarding traffic, problem is this process takes
27-30 seconds, regardless of hellointerval/holddown timers (I tried this
with the default of 3/10 and then with 1/3 and got the same 30 second delay
in fail-back).... Oh, by the way, all packets forwarded to the HSRP
interface bound for their respective destinations get dropped during this
30second fail-back blackout.....any thoughts?
Cheers,
Lance
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