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Cisco Bug: CSCvu36573 - Opflex connection failing for Hyper-v hosts on multipod setups

Last Modified

Sep 02, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

4.2(4i) 4.2(4k) 4.2(4o) 5.0(1k)

Description (partial)

Symptom:
When a multi-pod environment is deployed in a non-home pod, the hyper-v servers cannot establish a successful connection to the leaf switch, and the opflexODev and OpflexIDEp objects are not created on the leaf switch. This results in a traffic outage, as the on-demand EPGs will be removed from the setup.

Conditions:
Hyper-v hosts connected to the non-home pod subnet will not resolve the anycast IP address to the proper subnet, which causes leaf discovery to fail. In a failure scenario, the following logs will be seen:

Hyper-V VTEP IP is allocated to 172.17.0.0/16 subnet and it is trying to wrongly reach to leaf anycast IP of 172.16.0.30 instead of 172.17.0.30 and will result in failure.

05/01/2020 10:43:57-20072-26||DiscoverSwitchSettings||  Discovered VTEP address is 172.17.0.10 Macaddress is 112233445566 vTepNetworkName: vEthernet (VNET_apicinfra) VtepSubnetMask 255.255.0.0
..
05/01/2020 10:43:58-20072-26||GetSwitchPropertyOpaqueData|| VMMDOM: Domain CTRLR: SCVMM HOSTORIP: 10.10.10.50 AnyCAST: 172.16.0.30 NonEnglish: 1
...
05/01/2020 10:43:58-20072-26||DiscoverSwitchSettings|| CtrlrName:SCVMM, DomainName:Domain, SCVMM_LeafAnycastAddr:172.16.0.30, MPodAnyCastAddr 172.16.0.30
...
05/01/2020 10:43:58-20072-26||SendRequest|| Querying Leaf URL https://172.16.0.30/api/node/class/topSystem.xml
05/01/2020 10:44:03-20072-26||SendRequestWithCert|| Exception Message : The operation has timed out
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