SROS Command Line Interface Reference Guide
Router (PIM Sparse) Configuration Command Set
5991-2114
© Copyright 2007 Hewlett-Packard Development Company, L.P.
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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. Use the
no
form of this command to remove a static IP address for the RIP router.
Syntax Description
<ip address>
Specifies the IP address for the RP.
access-group
<access-list-name>
Optional. Specifies the particular access group to which the RP
applies.
Default Values
No default necessary for this command.
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.
Usage Examples
The following example specifies an IP address of 172.22.5.100 for the RP:
ProCurve(config)#
router pim-sparse
ProCurve(config-pim-sparse)#
rp-address 172.22.5.100
Содержание ProCurve Secure 7102dl
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