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Figure 67: MC-EP in Passive Mode
When in passive mode, the MC-EP peers stay dormant as long as one active pseudowire is
signaled from the remote end. If more than one pseudowire belonging to the passive MC-EP
becomes active, then the PE1 and PE2 pair applies the MC-EP selection algorithm to select the
best choice and blocks all others. No signaling is sent to the remote pair to avoid flip-flop
behavior. A trap is generated each time MC-EP in passive mode activates. Every occurrence of
this kind of trap should be analyzed by the operator as it is an indication of possible mis-
configuration on the remote (active) MC-EP peering.
In order for the MC-EP passive mode to work, the pseudowire status signaling for active/standby
pseudowires should be enabled. This involves the following CLI configurations:
For the remote MC-EP PE3, PE3 pair:
config>service>vpls>endpoint# no suppress-standby-signaling
When MC-EP passive mode is enabled on the PE1 and PE2 pair the following command is always
enabled internally, regardless of the actual configuration:
config>service>vpls>endpoint no ignore-standby-signaling
Support for Single Chassis Endpoint Mechanisms
In cases of SC-EP, there is consistency check to ensure that the configuration of the member
pseudowires is the same. For example, mac-pining, mac-limit and ignore standby signaling must
OSSG251
WANMetro Region
Resilient Inter-domain
Handoff
VPLS
(Mesh)
VPLS
(Mesh)
PE3
PE3’
PE1
PE2
MC
EP
MC
EP
Pass
Active PW
Standby PWs
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