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Cisco MWR 2941 Mobile Wireless Edge Router Software Configuration Guide, Release 12.2(33)MRB

OL-21227-02

Chapter 4 Configuring the Cisco MWR 2941 Router Using the CLI

Configuration Sequence

• DNS-Based SSM Mapping—DNS-based SSM mapping enables you to configure the last hop router

to perform a reverse DNS lookup to determine sources sending to groups. When DNS-based SSM

mapping is configured, the router constructs a domain name that includes the group address G and

performs a reverse lookup into the DNS. The router looks up IP address resource records (IP A RRs)

to be returned for this constructed domain name and uses the returned IP addresses as the source

addresses associated with this group. SSM mapping supports up to 20 sources for each group. The

router joins all sources configured for a group. To configure DNS-based SSM mapping, see

Configuring DNS-Based SSM Mapping.

Configuring Static SSM Mapping

Static SSM Mapping allows the the last hop router in an SSM deployment to determine the IP addresses

of sources sending to groups. Follow these steps to configure static SSM mapping on the Cisco MWR

2941.

Step 1 Enter enable mode.

Router> enable

Step 2 Enter configuration mode.

Router# configure terminal

Router(config)#

Step 3 Use the ip igmp ssm-map enable command to enable SSM mapping for groups in the configured SSM

range.

Router(config)# ip igmp ssm-map enable

Step 4 If you want use static SSM mapping exclusively, use the no ip igmp ssm-map query dns command to

disable DNS-based SSM mapping.

Router(config)# no ip igmp ssm-map query dns

Step 5 Use the ip igmp ssm-map static command to configure a static SSM mapping entry.

Router(config)# ip igmp ssm-map static 11 172.16.8.11

If you want to configure additional static SSM mappings, repeat this step.

Configuring DNS-Based SSM Mapping

DNS-based SSM mapping allows the last hop router to perform DNS lookups to learn the IP addresses

of sources sending to a group. Follow these steps to configure DNS-based SSM mapping.