Cisco Systems 3560 Manual De Usuario

Senders of multicast traffic announce their existence through register messages received from the source 
first-hop router (designated router) and forwarded to the RP. Receivers of multicast packets use RPs to 
join a multicast group by using explicit join messages. RPs are not members of the multicast group; 
rather, they serve as a meeting place for multicast sources and group members.

You can configure a single RP for multiple groups defined by an access list. If there is no RP configured 
for a group, the multilayer switch treats the group as dense and uses the dense-mode PIM techniques.

Beginning in privileged EXEC mode, follow these steps to manually configure the address of the RP. 
This procedure is optional.

Enter global configuration mode.

ip pim rp-address ip-address 
[access-list-number] [override]

Configure the address of a PIM RP. 

By default, no PIM RP address is configured. You must configure the IP 
address of RPs on all routers and multilayer switches (including the RP). 
If there is no RP configured for a group, the switch treats the group as 
dense, using the dense-mode PIM techniques. 

A PIM device can be an RP for more than one group. Only one RP address 
can be used at a time within a PIM domain. The access-list conditions 
specify for which groups the device is an RP.

For ip-address, enter the unicast address of the RP in dotted-decimal 
notation.

(Optional) For access-list-number, enter an IP standard access list 
number from 1 to 99. If no access list is configured, the RP is used for 
all groups.

(Optional) The override keyword means that if there is a conflict 
between the RP configured with this command and one learned by 
Auto-RP or BSR, the RP configured with this command prevails. 

access-list access-list-number {deny | 
permit} source [source-wildcard]

Create a standard access list, repeating the command as many times as 
necessary.

For access-list-number, enter the access list number specified in 
Step 2.

The deny keyword denies access if the conditions are matched. The 
permit keyword permits access if the conditions are matched.

For source, enter the multicast group address for which the RP should 
be used.

(Optional) For source-wildcard, enter the wildcard bits in dotted 
decimal notation to be applied to the source. Place ones in the bit 
positions that you want to ignore.

Recall that the access list is always terminated by an implicit deny 
statement for everything.

Return to privileged EXEC mode.

Verify your entries.

(Optional) Save your entries in the configuration file.