Virtual Private LAN Services
7750 SR OS Services Guide Page 551
replication cannot share the same common requirements. In this case, an egress multicast group
would be created for each set of common requirements. An egress multicast group may contain SAPs
from many different VPLS instances. It should be understood that an egress multicast group is not
equivalent to an egress forwarding plane flooding list. An egress multicast group only identifies
which SAPs may participate in efficient multicast replication. As stated above, entries in a flooding
list are populated due to VPLS destination creation or IGMP snooping events.
The no form of the command removes a specific egress multicast group. Deleting an egress multicast
group will only succeed when the group has no SAP members. To remove SAP members, use the no
multicast-group group-name command under each SAP’s egress context.
Note: Efficient multicast replication will only be performed on IOMs that support chassis mode b If
an IOM does not support mode b operation, egress-multicast-group membership is ignored on that
IOM’s egress forwarding planes. The chassis need not be placed into mode b for efficient multicast
replication to be performed on the capable IOMs.
Parameters group-name — Multiple egress multicast groups may be created on the system. Each must have a
unique name. The egress-multicast-group-name is an ASCII string up to 16 characters in length
and follows all the naming rules as other named policies in the system. The group’s name is used
throughout the system to uniquely identify the Egress Multicast Group and is used to provision a
SAP into the group.
Default None, each egress multicast group must be explicitly configured.
Values Up to 32 egress multicast groups may be created on the system.
description
Syntax description description-string
no description
Context config>service>egress-multicast-group
Description This command defines an ASCII string associated with egress-multicast-group-name.
The no form of the command removes an existing description string from egress-multicast-group.
Default none
Parameters description-string — The description command accepts a description-string parameter. The
description-string parameter is an ASCII string of up to 80 characters in length. Only printable
127 bit ASCII characters are allowed. If the string contains spaces, the string must be specified
with beginning and ending quotes.
Values
An ASCII string up to 80 characters in length.
dest-chain-limit
Syntax dest-chain-limit destinations per pass
no dest-chain-limit
Context config>service>egress-multicast-group
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