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Cisco Bug: CSCvt21691 - VLAN1 is allowed on the trunk port even though it is not allowed in configurations of C111 interface

Last Modified

Aug 29, 2020

Products (1)

  • Cisco XE SD-WAN Routers

Known Affected Releases

16.12

Description (partial)

Symptom:
On a C1111 router running 16.12 SDWAN image, when a untagged unknown unicast/broadcast/multicast packets hits the trunk interface with native VLAN 1 of the router, the packet is forwarded through all other trunk interfaces even though they have a different native VLAN configured.

Conditions:
When trunk switchport with native VLAN 1 is configured on C1111 routers
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