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XGigabitEthernet port on S6720 locked in stack interface mode

Publication Date:  2017-08-10 Views:  539 Downloads:  0
Issue Description

Customer complain that cannot use a XGigabitEthernet as a service port because although the configuration have been erased the port is still in stack mode.


xge-stack interface view commands:

Handling Process

Checked stack configuration and all seem normal, port XGigabitEthernet0/0/24 ws not in configuration


[S6720-SW1]dis stack current-configuration
---------------current-configuration on slot 0 Begin---------------
stack enable
stack slot 0 renumber 0
stack slot 0 priority 255
stack reserved-vlan 4093
stack timer mac-address switch-delay 10
interface stack-port 0/1
 port interface XGigabitEthernet0/0/21 enable
interface stack-port 0/2
 port interface XGigabitEthernet0/0/22 enable
---------------current-configuration on slot 0 End-----------------

Root Cause

But when i have checked the stack port i could see that the port is still considered as a stack port.

[S6720-SW1-stack-port0/1]dis stack port
*down : administratively down
Logic Port         Phy Port                     Online       Status
stack-port0/1      XGigabitEthernet0/0/21       present      up
                   XGigabitEthernet0/0/24       present      down
stack-port0/2      XGigabitEthernet0/0/22       present      up
stack-port1/1      XGigabitEthernet1/0/21       present      up
stack-port1/2      XGigabitEthernet1/0/22       present      up

Custoer told me that he have configured this port to be used in the stack and then decided to use the port as a normal port.


On the S6720EI and S6720S-EI, every four of XGE interfaces from the left are added to one group. For example, XGE interfaces numbered 1 to 4 can be added to one group, but XGE interfaces numbered 2 to 5 cannot. That is, the number of the last XGE interface in each group must be the multiple of 4. If you configure any interface in each group as a physical member port, configurations on the other three interfaces in the group will be lost and the three interfaces cannot be used as service ports.

 Because customer wanted to use port 24 he moved stack configuration to XGigabitEthernet0/0/19 and XGigabitEthernet0/0/20 and ports 21,22,23 and 24 were usable after that.