Alcatel-Lucent 7750 SR Manual page 1685

egress-replication
Syntax egress-replication
Context show
Description This command enables the context to display egress flooding information for a VPLS service context
on a given MDA. A VPLS service context supports both Layer 2 and Layer 3 flooding modes. The
Layer 2 flooding mode is used for broadcast, Layer 2 multicast and unknown destination MAC
addressed packets. All available interfaces (SAP, spoke SDP and mesh-SDP) that reside on an egress
forwarding complex are included in the egress list except for SAPs that are defined in a residential
split horizon group (Layer 2 flooding is not permitted on residential SAPs). The Layer 3 flooding
mode is used for VPLS interfaces participating in IGMP snooping and is represented by an IP
multicast [s,g] record.
vpls
Syntax vpls vpls-service-id mda card/slot
vpls vpls-service-id mda card/slot [igmp-record group ip-address {source ip-address |
starg}]
Context show>egress-replication
Description The vpls vpls-service-id mda slot/mda command displays the flooding list used by the Layer 2
flooding mode for the VPLS service on the specified MDA. The Layer 2 flooding list is limited to
SAPs, spoke SDP and mesh-SDP bindings that exist on the egress forwarding complex serviced by
the specified MDA. For the 10G IOM, two MDAs share the same egress forwarding plane. In this
case the Layer 2 flooding list will contain destinations for both MDAs (if entries exist). . The only
VPLS interfaces that will not be included in the list are residential SAPs because Layer 2 replication
is not permitted to a residential SAP. A packet processed by the egress Layer 2 flooding list may not
be replicated to each destination. A packet will not be replicated to an interface on the Layer 2
flooding list because of the following:
The ingress interface is the same as egress interface (source squelching rule)
Destination SAPs in the list may be displayed in a chain context representing common replication
behavior. All SAPs in a single chain are processed a single time through the egress forwarding plane.
If a discard decision is made for the first SAP in the chain, no replication processing is done for any of
the chain members. If the forwarding plane decides to replicate the first SAP in the chain, it will
replicate to all SAPs in the chain.
The vpls vpls-service-id mda card/slot igmp-record grp-address {source source-ip-address | starg}
command displays the IGMP record based flooding list for the vpls-service-id on the specified MDA.
Unlike the Layer 2 flooding list for the VPLS context, an IGMP record list may contain interfaces
from other VPLS contexts due to MVR (Multicast VPLS Registration) events on the individual VPLS
interfaces. VPLS interfaces in other VPLS contexts become associated with the specified vpls-
7750 SR OS Services Guide
• The ingress interface split horizon group is the same as the egress interface (residential bridging
rule).
• The egress interface is down or blocking.
• The packet matches a discard event while processing that destination interface.
• An egress MTU violation occurs for the destination interface.
VPLS Show Commands
Page 1685