I have a case with the behavior of HSRP working with vPC. I have a pair of N7706 (code 8.2) forming a vPC Domain and make a vPC connection to a N93108TC-EX.
On this lab, I have 2 VLAN 49, 53 which are provisioned on all 3 switches, and the GWs are placed on the N7Ks and was configured with HSRP (All HSRP groups are converged and N7K-01 is chose to be control-plane Active).
I have 2 hosts attached to the N9K, one (Host A) belongs to VLAN 49, another (Host B) to VLAN 53. Host A and Host B can ping each other. Below that the test I make to see how the HSRP worked:
- Firstly, I shutdown interface-vlan 49 on N7K-02, Host A and Host B can ping each other successfully.
- After that, I no shut interface-vlan 49 on N7K-02, and let's HSRP converge.
- Secondly, I shutdown the interface-vlan 49 on N7K-01, Host A and Host B lost communication to each other!!!
I redo the test again and find that: the communication lost when I shutdown interface-vlan on N7K-01 only, and even in case of both interface-vlans (49 and 53) are shut on N7K-01, the communication still lost. It seem that the traffic only traveled to N7K-01!!!
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