Virtual Private LAN Services
7750 SR OS Services Guide Page 463
be the same. In the MC-EP case, there is no consistency check between the member endpoints
located on different chassis. The operator must verify carefully the configuration of the two
endpoints to ensure consistency.
The following rules apply for suppress-standby-signaling and ignore-standby parameters:
• Regular MC-EP mode (non-passive) will follow the suppress-standby-signaling and
ignore-standby settings from the related endpoint configuration.
• For MC-EP configured in passive mode, the following settings will be used, regardless of
previous configuration: “suppress-standby-sig” and “no ignore-standby-sig”. It is
expected that when passive mode is used at one side that the regular MC-EP side will
activate signaling with “no suppress-stdby-sig”.
• When passive mode is configured in just one of the nodes in the MC-EP peering, the other
node will be forced to change to passive mode. A trap is sent to the operator to signal the
wrong configuration.
This section describes also how the main mechanisms used for single chassis endpoint are adapted
for the MC-EP solution.
MAC Flush Support in MC-EP
In an MC-EP scenario, failure of a pseudowire or gateway PE will determine activation of one of
the next best pseudowire in the MC-EP group. This section describes the MAC flush procedures
that can be applied to ensure black-hole avoidance.
Figure 68 depicts a pair of PE gateways (PE3 and PE3) running MC-EP towards PE1 and PE2
where F1 and F2 are used to indicate the possible direction of the MAC flush signaled using T-
LDP MAC withdraw message. PE1 and PE2 can only use regular VPLS pseudowires and do not
have to use a MC-EP or a regular pseudowire endpoint.
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