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Command Reference Guide Router (PIM Sparse) Configuration Command Set
61200990L1-35E Copyright © 2005 ADTRAN 1131
rp-address <ip address> access-group <access-list-name>
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.
Syntax Description
<ip address> Specifies the IP address for the RP.
access-group Optional. Specifies the access group to which the RP applies.
<access-list-name> Optional. Specifies the name of the access group.
Default Values
No default necessary for this command.
Applicable Platforms
This command applies to the NetVanta 2000 and 5000 and the Total Access 900 Series units.
Command History
Release 11.1 Command was introduced.
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 (see 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.