The operational state of the Flex PW port is driven by the ability of the Epipe service (that ties the PW port to the spoke SDP) to forward traffic. The following events renders the PW port non-operational and triggers propagation of the PW status bits toward the remote end:
The Epipe service is shut down. This raises the following flags on the local end:
lacIngressFault
lacEgressFault
psnEgressFault
The corresponding PW status bits that are propagated to the remote end raises the counterpart flags on the remote end.
The PW port within the Epipe service is shutdown. This raises the following flags on the local end:
lacIngressFault
lacEgressFault
The corresponding PW status bits that are propagated to the remote end raises the counterpart flags on the remote end.
MTU mismatch. This raises the following flags on the local end:
lacIngressFault
lacEgressFault
pwNotForwarding
The corresponding PW status bits that are propagated to the remote end raises the counterpart flags on the remote end.
In addition, PW port transitions into a non-operation state without propagating any PW status bits if the remote end cannot be reached.
The operation state of the Flex PW port state can be observed through the state of the underlying tunnel and the corresponding service via the following show command:
show pw-port 10 detail
===============================================================================
PW Port Information
===============================================================================
PW Port : 10
Encap : dot1q
IfIndex : 1526726666
Description : PW Port
Dot1Q Ethertype : 0x8100
Service Id : 10239
Admin Status : up
Oper Status : up
===============================================================================