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New Member

Nexus 5548 Link is operationally individual

Hey,

we have 2 FlexPod (DC1 and DC2) with two Nexus 5548 on each side. We connected each Nexus on DC1 with the one on DC2 with 2 ports (Ethernet 1/21,1/22) in the port-channel 15. All worked fine until the day one SFP module was broken and we changed it. After a few minutes we noticed that a few Esxi hosts weren't connected anymore. A "show interface ethernet 1/22" showed the state "Link not connected", the "show port-channel sum" showed this:

15    Po15(SU)    Eth      LACP      Eth1/21(P)   Eth1/22(D)

I also noticed a syslog:

2013 Jul 22 12:10:36 mez: %ETH_PORT_CHANNEL-4-PORT_INDIVIDUAL: port Ethernet1/22 is operationally individual

After a few minutes the port-channel was fully  up again and we could the Esxi hosts. Shutting down the ports and "no shutdown" them didn't work either.

But a few minutes later the old problem came up.

Now it changes between these two states every 15 minutes. I think it is a problem with the lacp channel, but the config seems fine. I hope you can help me - if you need any further information, just ask!

Regards Robert

Everyone's tags (4)
5 REPLIES
VIP Super Bronze

Nexus 5548 Link is operationally individual

Hi,

Have you tried deleting the portchannel and rebuilding it?

Also, are the links betwen the 5ks configured as vPC peer-link?

Can you post the portchannel and the physical ports configs?

HTH

New Member

Nexus 5548 Link is operationally individual

Yes I also tried this - same result.

No they're just a normal vPC.

dc1-n5k-02:

interface Ethernet1/22

  description dc2-n5k-01

  shutdown

  switchport mode trunk

  channel-group 15 mode active

interface port-channel15

  description DC Connection

  switchport mode trunk

  spanning-tree port type network

  vpc 15

dc2-n5k-01:

interface Ethernet1/22

  description dc1-n5k-02

  shutdown

  switchport mode trunk

  channel-group 15 mode active

interface port-channel15

  description DC Connection

  switchport mode trunk

  spanning-tree port type network

  vpc 15

"Shutdown" is because of the disconnections of the ESXi Hosts.

Regards

Robert

Nexus 5548 Link is operationally individual

I would look at whether your ESXi hosts are correctly configured for LACP bundling.

Kevin Dorrell

Luxembourg

New Member

Nexus 5548 Link is operationally individual

I also checked this - ESXi are are configured correctly.

Regards

Robert

Cisco Employee

Nexus 5548 Link is operationally individual

Hi Robert,

Could you share the output of show lacp counters interface port-channel15?

If we would be seeing a lot of difference in the RX and TX of LACPDU's we can assume 3 things, either we're not receiving them and we have a link problem, they're getting dropped in the path towards the CPU by copp or rate-limiting on the asic or the CPU has not enough time to process them because we have another high priority process consuming cpu cycles.

Kristof

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