Posted on by patrickmarcpreuss

Cisco Nexus Port-channel Issue

Some strange thing we came across the other day.

After the Power outage one of the Port-channels did not came up.

VPC consistency showed that the Port-channel has ports assigned on both Nexus Switches there should only be local ports connected.

Even the remote port was configured for a different port channel.

We ended up with removing the port channel 509 on the remote side and recreate the port channel.

  1. Configuration
    1. Local Port Channel
    2. Local Member
    3. Remote Port Channel
    4. Remote Port
  2. Links
show vpc consistency-parameters interface port-channel 509
   Legend:
       Type 1 : vPC will be suspended in case of mismatch
Name                        Type  Local Value            Peer Value            
-------------               ----  ---------------------- -----------------------
Shut Lan                    1     No                     No                     
STP Port Type               1     Default                Default                
STP Port Guard              1     None                   None                         
STP MST Simulate PVST       1     Default                Default                
lag—id                      1     [<ommited>]                                   
mode                        1     active                 on                     
Members                     1     Ethernet2/2/1          Ethernet157/1/2        
                            1                                                   
Speed                       1     10 Gb/s                1000 Mb/s              
Duplex                      1     full                   full                   
Port Mode                   1     trunk                  trunk                  
Native Vlan                 1     1                      1                      
MTU                         1     1500                   1500                   
Admin port mode             1     trunk                  trunk                  
Allowed VLANs               -     1-10,15-20,30,37,99    1-10,15-20,30,37,9

Configuration

Local Port Channel 

interface Port-Channel 509
end

Local Member 

interface Ethernet2/2/1
    switchport
    switchport mode trunk
    channel-group 509
end

Remote Port Channel

interface Port-Channel 509
end

Remote Port 

interface Ethernet157/1/2
    switchport
    switchport mode trunk
    channel-group 506
end

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