HPE FlexNetwork 5510 HI Series Configuration Manual page 308

The elected BSR distributes the RP-set information collected from C-RPs to all routers in the IPv6
BIDIR-PIM domain. All routers use the same hash algorithm to get an RP for a specific IPv6 multicast
group.
Configuring a C-BSR
IMPORTANT:
Because the BSR and other devices exchange a large amount of information in the IPv6 BIDIR-PIM
domain, reserve a large bandwidth between the C-BSR and other devices.
A BSR policy enables the router to filter BSR messages by using an ACL that specifies the legal BSR
addresses. Configure a BSR policy to guard against the following BSR spoofing cases:
• Some maliciously configured hosts can forge BSMs to fool routers and change RP mappings.
Such attacks often occur on border routers.
• When an attacker controls a router on the network, the attacker can configure the router as a
C-BSR to win the BSR election. Through this router, the attacker controls the advertising of RP
information.
When you configure a C-BSR, follow these restrictions and guidelines:
• C-BSRs should be configured on routers on the backbone network.
• You must configure the same BSR policy on all routers in the IPv6 BIDIR-PIM domain. The BSR
policy discards illegal BSR messages, but it partially guards against BSR attacks on the
network. If an attacker controls a legal BSR, the problem still exists.
To configure a C-BSR:
Step
Enter system view.
1.
Enter IPv6 PIM view.
2.
Configure a C-BSR.
3.
(Optional.) Configure a BSR
4.
policy.
Configuring an IPv6 PIM domain border
An IPv6 PIM domain border determines the transmission boundary of bootstrap messages.
Bootstrap messages cannot cross the domain border in either direction. A number of PIM domain
border interfaces partition a network into different IPv6 BIDIR-PIM domains.
To configure an IPv6 PIM domain border:
Step
Enter system view.
1.
Enter interface view.
2.
Configure an IPv6 PIM
3.
domain border.
Command
system-view
ipv6 pim [ vpn-instance
vpn-instance-name ]
c-bsr ipv6-address [ scope
scope-id ] [ hash-length
hash-length | priority priority ] *
bsr-policy ipv6-acl-number
Command
system-view
interface interface-type
interface-number
ipv6 pim bsr-boundary
298
Remarks
N/A
N/A
By default, no C-BSRs exist.
By default, no BSR policy exists,
and all bootstrap messages are
regarded as legal.
Remarks
N/A
N/A
By default, an interface is not an
IPv6 PIM domain border.