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Cisco Bug: CSCuw40489 - 4500X HSRP link failure gives high ether channel convergence (3.2 sec)

Last Modified

Oct 06, 2018

Products (1)

  • Cisco Catalyst 4500 Series Switches

Known Affected Releases

3.8(0)

Description (partial)

Symptom:
Issue:
We ran a link failure between two 4500X switches multiple times (I.e fail one link out of two in port channel which connects two 4500X) and found out that it takes about few seconds for Layer-2 unicast, Layer-3 unicast and Layer-2 multicast to converge the traffic. The maximum we saw was 3.2 seconds. The time is high enough to trip the controllers (i.e end points). Controllers trip if the convergence time is more than 100 msec.

Conditions:
Topology:
4500X (Version 03.08.00.E.21 EFT build) HSRP as a distribution switches. Both 4500X are connected using two gigabit links in ether channel (i.e po10). Both the REP edge ports are configured on HSRP active switch.
Twelve IE4K as an access switches connected in a ether-channel ring  and it is running REP as a resiliency protocol. 
RA controllers as an endpoint also some amount of IXIA traffic. We are not exhausting  any link by scaling & performance testing.
4500X-HSRP-Active and Standby configs , topology and failure/recovery results are attached.
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