H3C Technologies H3C S12500-X Series Switches - Manual (Page 86)

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Configuring a static RP
If only one dynamic RP exists on a network, you can configure a static RP to avoid communication
interruption caused by single-point failures. The static RP also prevents frequent message exchange
between C-RPs and the BSR for RP election.
The static RP configuration must be the same on all routers in the PIM-SM domain.
To configure a static RP:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter PIM view.
pim [ vpn-instance
vpn-instance-name ]
N/A
3. Configure a static RP for
PIM-SM. static-rp rp-address [ acl-number |
preferred ] * By default, no static RP is
configured.
Configuring a C-RP
IMPORTANT:
When you configure a C-RP, reserve a relatively large bandwidth between the C-RP and other devices in
the PIM-SM domain.
In a PIM-SM domain, if you want a router to become the RP, you can configure the router as a C-RP. H3C
recommends that you configure C-RPs on backbone routers.
The C-RPs periodically send advertisement messages to the BSR, which collects RP set information. You
can configure the interval for sending the advertisement messages.
The holdtime option in C-RP advertisement messages defines the C-RP lifetime for the advertising C-RP.
The BSR starts a holdtime timer for a C-RP after the BSR receives an advertisement message. If the BSR
does not receive any advertisement message when the timer expires, it regards the C-RP failed or
unreachable.
To guard against C-RP spoofing, you must configure a filtering policy on the BSR to define the legal C-RP
address range and the multicast group range to which the C-RP is designated. In addition, because every
C-BSR might become the BSR, you must configure the same filtering policy on all C-BSRs in the PIM-SM
domain.
To configure a C-RP:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter PIM view. pim [ vpn-instance vpn-instance-name ] N/A
3. Configure a C-RP.
c-rp ip-address [ advertisement-interval
adv-interval | group-policy acl-number
| holdtime hold-time | priority priority ]
*
By default, no C-RP is
configured.
4. (Optional.) Configure a legal
C-RP address range and the
multicast group range to
which the C-RP is designated.
crp-policy acl-number
By default, no restrictions are
defined.