H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – Multicast
H3C S7500E Series Ethernet Switches Chapter 5 PIM Configuration
5-26
II. 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.
Follow these steps to configure a C-RP:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter PIM view
pim
—
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 ] *
Optional
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
 Note:
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.
III. Enabling auto-RP
Auto-RP announcement and discovery messages are respectively addressed to the
multicast group addresses 224.0.1.39 and 224.0.1.40. With auto-RP enabled on a