3Com S7906E Command Reference Manual page 1372

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IPv6 PIM Configuration Commands
The term "router" in this document refers to a router in a generic sense or a Layer 3 switch running IPv6
PIM.
IPv6 PIM Configuration Commands
bsr-policy (IPv6 PIM view)
Syntax
bsr-policy acl6-number
undo bsr-policy
View
IPv6 PIM view
Default Level
2: System level
Parameters
acl6-number: Basic IPv6 ACL number, in the range of 2000 to 2999. When an IPv6 ACL is defined, the
source keyword in the rule command specifies a legal BSR source IPv6 address range.
Description
Use the bsr-policy command to configure a legal BSR address range to guard against BSR spoofing.
Use the undo bsr-policy command to remove the restriction of the BSR address range.
By default, there are no restrictions on the BSR address range, namely the BSR messages from any
source are regarded to be eligible.
Examples
# Configure a legal BSR address range so that only routers on the segment 2001::2/64 can become the
BSR.
<Sysname> system-view
[Sysname] acl ipv6 number 2000
[Sysname-acl6-basic-2000] rule permit source 2001::2 64
[Sysname-acl6-basic-2000] quit
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