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Cisco Bug: CSCvu82331 - N9K: Native VLAN is not programmed correctly for Port-channels once re-configured

Last Modified

Sep 23, 2020

Products (67)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 93108TC-FX Switch
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Known Affected Releases

9.2(4) 9.3(4)

Description (partial)

Symptom:
After reload,  if the portchannel, that has native VLAN configured, is re-configured to have new native VLAN, before this particular port channel goes to link UP state first time, the new native VLAN is not programmed correctly.

LEAF3-FX# show int Po101
port-channel101 is down (No operational members)
admin state is up,

LEAF3-FX# sh run int Po101 | i native
switchport trunk native vlan 666

LEAF3-FX# show sys int eltm info  interface Po101 | grep -A 1 Operation
 Operational VLAN's (1):
  666

LEAF3-FX# show hard int tah int Po101 | i default
        info_default_vlan : 666

LEAF3-FX# conf t
LEAF3-FX(config)# int Po101
LEAF3-FX(config-if)# switchport trunk native vlan 1158
LEAF3-FX(config-if)# switchport trunk allowed vlan 1158

LEAF3-FX# sh run int Po101 | i native
  switchport trunk native vlan 1158

LEAF3-FX# show sys int eltm info  interface Po101 | grep -A 1 Operation
 Operational VLAN's (1):
  666

LEAF3-FX# show hard int tah int Po101 | i default
        info_default_vlan : 666

Conditions:
Native vlan is reconfigured for port-channel, that has never come up yet after reload.
Issue was seen on 93180YC-EX and 93180YC-FX switches, but most probably not limited to these models.
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Bug Details Include

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