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Cisco Bug: CSCui95880 - HSRP for IPv6 flaps when there is a loop in the network.

Last Modified

Apr 17, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

12.2(33)SXI 15.3(2.25)T

Description (partial)

Symptom: HSRP for IPv6 flaps when there is a loop in the network, but IPv4 HSRP state remains stable for the same vlan.

logs

%HSRP-5-STATECHANGE: Vlan154 Grp 154 state Speak -> Standby
%HSRP-5-STATECHANGE: Vlan154 Grp 154 state Standby -> Listen
%HSRP-5-STATECHANGE: Vlan154 Grp 154 state Standby -> Listen
%HSRP-5-STATECHANGE: Vlan154 Grp 154 state Speak -> Standby
%HSRP-5-STATECHANGE: Vlan154 Grp 154 state Standby -> Active
Conditions: This symptom is observed When layer 2 loop is in the network.
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