Command Manual - Multicast Protocol
Quidway S6500 Series Ethernet Switches
Chapter 5 PIM Configuration Commands
Huawei Technologies Proprietary
5-1
Chapter 5 PIM Configuration Commands
Note:
When running IP multicast protocols, Ethernet switches also provide the functions of
switches. We use routers in this manual to stand for not only the common routers but
also the layer 3 Ethernet switches running IP multicast protocols.
5.1 PIM Configuration Commands
5.1.1 bsr-policy
Syntax
bsr-policy acl-number
undo bsr-policy
View
PIM view
Parameter
acl-number
: ACL number imported in BSR filtering policy, in the range of 2000 to 2999.
Description
Using
bsr-policy
command, you can limit the range of legal BSRs to prevent BSR
proofing. Using
undo
bsr-policy
command, you can restore the default setting, that is,
no range limit is set and all received messages are taken as legal.
In the PIM SM network using BSR (bootstrap router) mechanism, every router can set
itself as C-BSR (candidate BSR) and take the authority to advertise RP information in
the network once it wins in the contention. To prevent malicious BSR proofing in the
network, the following two measures need to be taken:
z
Prevent the router from being spoofed by hosts though faking legal BSR
messages to modify RP mapping. BSR messages are of multicast type and their
TTL is 1, so this type of attacks often hit edge routers. Fortunately, BSRs are
inside the network, while assaulting hosts are outside, therefore neighbor and
RPF checks can be used to stop this type of attacks.
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