Cisco Systems 3560 Manual De Usuario

Go to this URL to see SSM mapping configuration examples:

To configure DNS-based SSM mapping, you need to create a DNS server zone or add records to an 
existing zone. If the routers that are using DNS-based SSM mapping are also using DNS for other 
purposes, you should use a normally configured DNS server. If DNS-based SSM mapping is the only 
DNS implementation being used on the router, you can configure a false DNS setup with an empty root 
zone or a root zone that points back to itself.

Beginning in privileged EXEC mode, follow these steps to configure DNS-based SSM mapping:

Use static traffic forwarding with SSM mapping to statically forward SSM traffic for certain groups. 

end

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.

configure terminal

Enter global configuration mode.

ip igmp ssm-map enable

Enable SSM mapping for groups in a configured SSM range.

ip igmp ssm-map query dns

(Optional) Enable DNS-based SSM mapping.

By default, the ip igmp ssm-map command enables DNS-based SSM 
mapping. Only the no form of this command is saved to the running 
configuration.

Use this command to re-enable DNS-based SSM mapping if 
DNS-based SSM mapping is disabled.

ip domain multicast domain-prefix

(Optional) Change the domain prefix used by the switch for DNS-based 
SSM mapping.

By default, the switch uses the ip-addr.arpa domain prefix.

ip name-server server-address1 
[server-address2... server-address6]

Specify the address of one or more name servers to use for name and 
address resolution.

Repeat Step 5 to configure additional 
DNS servers for redundancy, if required.

—

end

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.