Description
Version: S5720EI-V200R009C00SPC500
Topology
Error occurs when the command dot1q termination vid 101 is configured on the interface g0/0/1.101, and the error message indicates VCMP role error
Corresponding configuration
SW1：
interface GigabitEthernet0/0/1
undo portswitch
#
interface GigabitEthernet0/0/1.101
description TO-AR1_GE0/0/1
ip address 192.168.255.1 255.255.255.252
ospf cost 1000
ospf authentication-mode hmac-md5 123 cipher %^%#/|{1Tk4>(L6hEX:@a&N::-{pN~uF847fl7Oy}z)W%^%#
AR1：
interface GigabitEthernet0/0/1
description TO-SW1_GE0/0/1
ip address 192.168.255.2 255.255.255.252
ospf cost 1000
ospf authentication-mode md5 123 cipher $c$3$5\FbRUrg8PrtdX1RaYaBUz76faHIYrAIlw==
Alarm
VCMP role error
Process
Check the VCMP status of the switch through command display vcmp status. The result shows the role for the current switch is client in this VCMP management domain.
Besides, through command display vcmp interface brief, we find that the VCMP function for all the switch interfaces are enabled, just as by default.
Role client, as the managed one, would be impacted by the VCMP management action. The client switch, belonging to a specific VCMP domain, would synchronize the VLAN information carried in the VCMP packets sent from the server switch.
Features will be inherited after the interface switched from layer 2 to layer 3, and the VCMP function will be enabled on the sub-interface, in which situation, it conflicts with the VLAN termination.
Root cause
The VCMP function is not disabled on the sub-interface or the role of the switch is Client in the VCMP management domain, which causes the error occurred when configuring the dot1q termination vid 101.
Solution
Solution 1:
Configuredot1q termination vid after the VCMP function is disabled on the layer 3 sub-interface.
interface GigabitEthernet0/0/1.101
vcmp disable
dot1q termination vid 101
Solution 2:
Modify the VCMP role to Silent.
[SW1]vcmp role silent
Advises
The VCMP role of the switch should be modified or the VCMP function should be disable on the layer 3 interfaces before configuring the dot1q termination vid.
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