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Command Reference Guide
rp-address <ip address>
Use the rp-address command to specify a static IP address for the rendezvous point (RP) router. The
access-group keyword is used to limit the multicast group addresses to which the RP applies. Use the no
form of this command to remove a static IP address for the RP router. Variations of this command include:
rp-address <ip address>
rp-address <ip address> access-group <name>
Syntax Description
<ip address>
access-group <name>
Default Values
No default values are necessary for this command.
Command History
Release 11.1
Functional Notes
The access-group keyword is used to limit the multicast group addresses to which the RP applies. If more
than one RP is configured for a given multicast group address, then a hash algorithm determines the
appropriate hierarchy (as shown below). The results of the hash algorithm can be seen with the show ip
pim-sparse rp-map command.
The hash algorithm is defined in RFC 2117 section 3.7 as follows:
For each RP address C(i) in the RP-Set, whose Group-prefix covers G, compute a value:
Value(G,M,C(i))=(1103515245 * ((1103515245 * (G&M)+12345) XOR C(i)) + 12345) mod 2^31
where M is a hash-mask included in Bootstrap messages.This hash-mask allows a small number of
consecutive groups (e.g., 4) to always hash to the same RP. For instance, hierarchically encoded data can
be sent on consecutive group addresses to get the same delay and fate-sharing characteristics.
The candidate with the highest resulting value is then chosen as the RP for that group, and its identity and
hash value are stored with the entry created.
Ties between C-RPs having the same hash value are broken in advantage of the highest address.
Usage Examples
The following example specifies an IP address of 172.22.5.100 for the RP:
(config)#router pim-sparse
(config-pim-sparse)#rp-address 172.22.5.100
60000CRG0-35E
Specifies the IP address for the RP. IP addresses should be expressed in
dotted decimal notation (for example, 10.10.10.1).
Optional. Specifies the particular access group to which the RP applies.
Command was introduced.
Copyright © 2012 ADTRAN, Inc.
Router (PIM Sparse) Command Set
3018
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