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Cisco Bug: CSCvi23904 - Show vlan id command shows non-existing VLAN on trunk

Last Modified

Oct 01, 2019

Products (1)

  • Cisco ME 1200 Series Carrier Ethernet Access Devices

Known Affected Releases

15.6(1.3)

Description (partial)

Symptom:
When using the command show vlan id # for a non-existing VLAN, the output shows the VLAN as if were created and assigned to a trunk port where all VLANs are allowed by default.

me1200# show vlan
VLAN  Name                              Interfaces
----  --------------------------------  ----------
1     default                           Gi 1/1-2,4-6
10    VLAN0010                          Gi 1/3-4

me1200# show vlan id 40 --> Non-existing VLAN
VLAN  Name                              Interfaces
----  --------------------------------  ----------
40    VLAN0040                          Gi 1/4

me1200# show running-config interface GigabitEthernet 1/4
Building configuration...
interface GigabitEthernet 1/4
 switchport mode trunk
 qos dscp-remark rewrite
!

If the list of allowed VLANs is restricted on the trunk, the output for the show vlan id # command for a non existing VLAN stills shows the VLAN as if were created, but not assigned to any interface.

me1200# show running-config interface GigabitEthernet 1/4
Building configuration...
interface GigabitEthernet 1/4
 switchport trunk allowed vlan 1,10
 switchport mode trunk
 qos dscp-remark rewrite


me1200# sh vlan id 40
VLAN  Name                              Interfaces
----  --------------------------------  ----------
40    VLAN0040

Conditions:
This problem affects ME1200 switches. Tested in 15.6(3)SN1 and 15.6(5)SN
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