Ip Interworking - Cisco ASR 9000 Series Configuration Manuallines

IP Interworking

Configured at Layer 3, IGMP provides a means for hosts in an IPv4 multicast network to indicate which
multicast traffic they are interested in and for routers to control and limit the flow of multicast traffic in the
network (at Layer 3).
IGMP snooping uses the information in IGMP membership report messages to build corresponding information
in the forwarding tables to restrict IP multicast traffic at Layer 2. The forwarding table entries are in the form
<Route, OIF List>, where:
• Route is a <*, G> route or <S, G> route.
• OIF List comprises all bridge ports that have sent IGMP membership reports for the specified route plus
The IGMP snooping feature can provide these benefits to a multicast network:
• Basic IGMP snooping reduces bandwidth consumption by reducing multicast traffic that would otherwise
• With optional configuration options, IGMP snooping can provide security between bridge domains by
• With optional configuration options, IGMP snooping can reduce the traffic impact on upstream IP
Refer to the Implementing Layer 2 Multicast with IGMP Snooping module in the Cisco ASR 9000 Series
Aggregation Services Router Multicast Configuration Guide for information on configuring IGMP snooping.
The applicable IGMP snooping commands are described in the Cisco ASR 9000 Series Aggregation Services
Router Multicast Command Reference.
IP Interworking
Customer deployments require a solution to support AToM with disparate transport at network ends. This
solution must have the capability to translate transport on one customer edge (CE) device to another transport,
for example, Frame relay to Ethernet. The Cisco ASR 9000 Series SPA Interface Processor-700 and the Cisco
ASR 9000 Series Ethernet line cards enable the Cisco ASR 9000 Series Routers to support multiple legacy
services.
IP Interworking is a solution for transporting Layer 2 traffic over an IP/MPLS backbone. It accommodates
many types of Layer 2 frames such as Ethernet and Frame Relay using AToM tunnels. It encapsulates packets
at the provider edge (PE) router, transports them over the backbone to the PE router on the other side of the
cloud, removes the encapsulation, and transports them to the destination. The transport layer can be Ethernet
on one end and Frame relay on the other end. IP interworking occurs between disparate endpoints of the
AToM tunnels.
Note Only routed interworking is supported between Ethernet and Frame Relay based networks for MPLS and
Local-connect scenarios.
The following figure shows the interoperability between an Ethernet attachment VC and a Frame Relay
attachment VC.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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all Multicast Router (mrouter) ports in the bridge domain.
flood an entire VPLS bridge domain.
filtering the IGMP reports received from hosts on one bridge port and preventing leakage towards the
hosts on other bridge ports.
multicast routers by suppressing IGMP membership reports (IGMPv2) or by acting as an IGMP proxy
reporter (IGMPv3) to the upstream IP multicast router.
Implementing Point to Point Layer 2 Services