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Cisco Bug: CSCvt92961 - Enhancement on TEP address advertisement by using RARP and GARP simultaneously

Last Modified

May 16, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

4.2(2f)

Description (partial)

Symptom:
A TEP endpoint can expire on the leaf switch if the host does not respond on a unicast ARP refresh packet initiated by the leaf switch.

Conditions:
Possible example when the host does not respond on ARP:
In multipod deployment there can be 2 IP addresses on an infra bridge domain SVI.
1st IP - from POD1 TEP range
2nd IP - from another POD TEP range (POD of the leaf switch itself)

The POD 1 IP address is usually set as primary (even for the leaf switches that are in different POD) and is used for ARP refresh as the source. The host may not respond on receiving the ARP packet if the source IP address used in the ARP packet does not belong to the target IP address.
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