62
Configuring an RP
An RP can be manually configured or dynamically elected through the BSR mechanism. For a large PIM
network, static RP configuration is a tedious job. Generally, static RP configuration is just a backup
method for the dynamic RP election mechanism to enhance the robustness and operational
manageability of a multicast network.
When both PIM-SM and BIDIR-PIM run on the PIM network, do not use the same RP to serve PIM-SM and
BIDIR-PIM. Otherwise, exceptions might occur to the PIM routing table.
Configuring a static RP
If only one dynamic RP exists in a network, manually configuring a static RP can avoid communication
interruption because of single-point failures. It can also avoid frequent message exchange between C-RPs
and the BSR.
To make a static RP to work correctly, you must perform this configuration on all routers in the PIM-SM
domain and specify the same RP address.
To configure a static RP:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network PIM view
or VPN instance 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
In a PIM-SM domain, you can configure routers that intend to become the RP as C-RPs. The BSR collects
the C-RP information by receiving the C-RP-Adv messages from C-RPs or auto-RP announcements from
other routers and organizes the information into an RP-set, which is flooded throughout the entire network.
Then, the other routers in the network calculate the mappings between specific group ranges and the
corresponding RPs based on the RP-set. HP recommends that you configure C-RPs on backbone routers.
To guard against C-RP spoofing, you must configure a legal C-RP address range and the range of
multicast groups to be served on the BSR. In addition, because every C-BSR can become the BSR, you
must configure the same filtering policy on all C-BSRs in the PIM-SM domain.
When configuring a C-RP, ensure a relatively large bandwidth between this C-RP and the other devices
in the PIM-SM domain.
To configure a C-RP:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter public network PIM view
or VPN instance PIM view.
pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Configure an interface to be a
C-RP for PIM-SM.
c-rp
interface-type interface-number
[
group-policy
acl-number
|
priority
priority
|
holdtime
hold-interval
|
advertisement-interval
adv-interval
] *
No C-RPs are configured by
default.