Configuring IP Multicast Routing
397
the leaf routers. The default RP should serve all global multicast groups.
That is all that has to be done.
Advertise RP Group Assignments
From each RP, a statement needs to be added that assigns and advertises
multicast groups to that RP. The multicast groups are then advertised so the
RP Mapping Agent can keep track of which RP hosts which multicast groups
and resolve conflicts when necessary.
The syntax for the command is ip pim send-rp-announce type
number scope ttl group-list access-list-number
. The command is
entered under the global configuration interface. The first two options are
type
and number, which are the interface type and number that indicate the
RP IP address. Scope defines the boundary of the RP advertisement by using
a high TTL value that will be effectively blocked by interfaces with the TTL
threshold set. The group-list uses the specified access list to determine
which multicast group ranges the RP is allowed to announce.
Here is an example of the command as well as a valid access list:
RouterA#conf t
Enter configuration commands, one per line. End with
CNTL/Z.
RouterA(config)#access-list 5 permit 224.0.0.0 0.0.255.255
RouterA(config)#$ip pim send-rp-announce fastethernet4/0
scope 230 group-list 5
RouterA(config)#^Z
RouterA#
RouterA#wr t
. . .
!
ip pim send-rp-announce FastEthernet4/0 scope 230 group-
list 5
!
access-list 5 permit 224.0.0.0 0.0.255.255
!
. . .
Copyright ©2000 SYBEX , Inc., Alameda, CA
www.sybex.com