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Egress Multicast Groups
Egress multicast groups to QinQ-encapsulated SAPs support includes:
• All SAP members of the given egress-multicast-group must have the same inner tag.
• A configuration flag, indicates, on a per egress-multicast-group basis, whether all member
SAPs have the same inner or outer VLAN tag.
Membership rules for egress-multicast-groups in QinQ SAPs include:
• All SAPs that are members of the same egress-multicast-groups must have the same
encapsulation type (as defined by encap-type qinq statement)
• All SAP members of the given multicast group, port, or multicast-group must have the
same inner Ethertype as well as outer Ethertype.
• All SAP members of the multicast-group must have the same inner-vlan-tag (the default
setting) or must have the same value of outer-vlan-tag as defined by the qinq-fixed-tag-
value command.
SAP Egress Filter
Due to the chaining nature of egress efficient multicast replication, only the IP or MAC filter
defined for the first SAP on each chain is used to evaluate the packet. To ensure consistent
behavior for all SAPs in the egress multicast group, when an IP or MAC filter is configured on one
SAP it must be configured on all. To prevent inconsistencies, each SAP must have the same egress
IP or MAC filter configured (or none at all) prior to allowing the SAP into the egress multicast
group.
Attempting to change the egress filter configured on the SAP while the SAP is a member of an
egress multicast group is not allowed.
If the configured common egress filter is changed on the egress multicast group, the egress filter
on all member SAPs will be overwritten by the new defined filter. If the SAP is removed from the
group, the previous filter definition is not restored.
SAP Egress QoS Policy
Each SAP placed in the egress multicast group may have a different QoS policy defined. When the
egress forwarding plane performs the replication for each destination in a chain, the internal
forwarding class associated with the packet is used to map the packet to an egress queue on the
SAP.
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