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Tuesday, March 5, 2013

Nexus 5010 outage after enabling jumbo frames (mtu 9216)


We attempted to enable jumbo frames on a Nexus 5010 (NX-OS version 4.2(1)N1(1)).  We created the policy map below and lost access to the switch.

policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216

After recovery we see from the logs that all vlans and interface were suspended.  We have attempted to look for reasons for a compatibility issue but we are unable to find what is checked and what could have been incompatible.  The other troubling thing is the adjacent switch suspended its interfaces too but no change was done there.  Can anyone explain what we have done wrong?

2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 1,10,601 on Interface port-channel1 are being suspen
ded. (Reason: QoSMgr Network QoS configuration incompatible)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_TRUNK_DOWN: Interface port-channel1, vlan 1,10,601 down
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel508 are being suspended.
(Reason: Global compat check failed)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel507 are being suspended.
(Reason: Global compat check failed)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel506 are being suspended.
(Reason: Global compat check failed)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 10 on Interface port-channel505 are being suspended.
(Reason: Global compat check failed)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-3-IF_ERROR_VLANS_SUSPENDED: VLANs 601 on Interface port-channel18 are being suspended.
(Reason: Global compat check failed)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_DOWN_INACTIVE: Interface port-channel508 is down (Inactive)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_DOWN_INACTIVE: Interface port-channel507 is down (Inactive)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_DOWN_INACTIVE: Interface port-channel506 is down (Inactive)
2011 Nov 22 23:43:09 phx-ipcg1dwfcma %ETHPORT-5-IF_DOWN_INACTIVE: Interface port-channel505 is down (Inactive)

Most probably this have happened because you have changed the compatibility requirements of the port-channel. Because on the Nexus 5000 for Layer 2 the MTU is changed on the global basis it had this effect.

Please click here for more information on configuring Ether Channels in Nexus 5000.

Please click here for more information on Configuration replace and Configuration roll back.



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