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Cisco Bug: CSCvv57874 - DHCPD DME stared before FNVs are read post fw upgrade

Last Modified

Oct 06, 2020

Products (1)

  • Cisco Application Policy Infrastructure Controller (APIC)

Known Affected Releases

3.2(9b) 3.2(9h)

Description (partial)

Symptom:
- Duplicate DHCP Leases are leased out by an APIC to AVE VM VTEP intfs (kni0/kni2)
- OpflexODev MOs are not created due to duplicate opflexIDEp MOs for these overlapping AVE VM VTEP intfs
- The affected APIC sets a DHCP Pool to available (usable-recovery) again instead of "recovery". The latter prevents leases to be allocated form the pool
- Affected APIC will keep this until dhcpd DME is shut down on it manually (requires root)
- Issue is caused by a race condition whereby APIC recovered DHCP MOs (Lease/Client) BEFORE reading FNV (fabric node vector) entries
- After an fw upgrade APICs can ONLY recover DHCP CLient/lease MOs by reading FNV first and therefore this needs to happen in that order

Conditions:
- Firmware upgrade from 3.2(9b) to 3.2(9h)
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