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Cisco Bug: CSCuq51608 - 40G link between N9k and UCS VIC 1285 not operational with defaults

Last Modified

Sep 17, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases


Description (partial)

- When N9K is connected with UCS VIC 1285, UCS VIC always inserts 802.1p/802.1q headers in the egress packets, given the DCBX standards.
- For access mode, it inserts .1q headers with VLAN id 0.
- This creates issues in N9K as native vlan is not handled for uplink ports.

- If Cisco UCS VIC 1285 (standalone mode, not UCSM managed) is connected to Nexus 9396 in standalone mode, connected thru SR4 (fiber channel) cables, the interface comes up on the switch, LLDP also detects the peer (if LLDP feature is enabled), but the link does not become operational. No packets are sent from adapter to switch.
- Can not connect N9K in access mode with UCS VIC 1285.
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