Configuring a c-rp, Enabling auto-rp – H3C Technologies H3C S7500E Series Switches User Manual
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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.
We recommend that you configure C-RPs on backbone routers.
To guard against C-RP spoofing, you need to 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 has a
chance to become the BSR, you need to configure the same filtering policy on all C-BSRs in the
PIM-SM domain.
Follow these steps to configure a C-RP:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enter public instance PIM view
or VPN instance PIM view
pim [ vpn-instance
vpn-instance-name ]
—
Configure an interface to be a
C-RP
c-rp interface-type interface-number
[ group-policy acl-number | priority
priority | holdtime hold-interval |
advertisement-interval
adv-interval ] *
Required
No C-RPs are configured by
default.
Configure a legal C-RP address
range and the range of multicast
groups to be served
crp-policy acl-number
Optional
No restrictions by default
z
When configuring a C-RP, ensure a relatively large bandwidth between this C-RP and the
other devices in the PIM-SM domain.
z
An RP can serve multiple multicast groups or all multicast groups. Only one RP can forward
multicast traffic for a multicast group at a moment.
Enabling auto-RP
Auto-RP announcement and discovery messages are addressed to the multicast group
addresses 224.0.1.39 and 224.0.1.40 respectively. With auto-RP enabled on a device, the
device can receive these two types of messages and record the RP information carried in such
messages.
Follow these steps to enable auto-RP: