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Cisco Bug: CSCur46582 - "Ethpm Internal Error" Message While Disabling dot1q-tunnel on HIF Ports

Last Modified

Feb 28, 2017

Products (1)

  • Cisco Nexus 6000 Series Switches

Known Affected Releases

7.1(0)N1(0.386)

Description (partial)

Eth102/1/1     1       eth  access up      none                      1000(D) --
Eth102/1/2     1       eth  access up      none                      1000(D) --
Eth102/1/3     1       eth  access down    Error disabled            auto(D) --
Eth102/1/4     1       eth  access down    Error disabled            auto(D) --
Eth102/1/5     1       eth  access down    Error disabled            auto(D) --
Eth102/1/6     1       eth  access down    Error disabled            auto(D) --
Eth102/1/7     1       eth  access down    Error disabled            auto(D) --
Eth102/1/8     1       eth  access down    Error disabled            auto(D) --
Eth102/1/9     1       eth  access down    Link not connected        auto(D) --
Eth102/1/10    1       eth  access down    Link not connected        auto(D) --

Symptom:
When switch port dot1q tunnel is applied and then removed on all the HIF ports using interface range
command, some of the HIF ports go to error-disabled state.

Conditions:
EthPM sends MTS_OPC_ETHPM_PORT_PRE_CFG  msg to FWM for each port. FWM clears the dot1q-tunnel config for the interface, and responds back to EthPM. For each interface, FWM fetches a group of other qinq interfaces which are in the same forwarding instance. If any port in the group has dot1q-tunnel configs, then FWM returns failure to EthPM, and EthPM will bring the port down by error-disabling it. 

 The first few MTS_OPC_ETHPM_PORT_PRE_CFG msgs fail because of the above mentioned reason(i.e. Other
ports in the group have dot1q-tunnel configs). For later msgs, FWM processing succeeds because other
ports in qinq group were already err-disabled, and they are not part of the group anymore.
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