HP 6125XLG R2306-HP 6125XLG Blade Switch IP Multicast Configuration Guide - Page 160

Configuring a BSR, summarized as follows

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does not receive any advertisement message when the timer expires, it regards the C-RP failed or unreachable. To guard against C-RP spoofing, you must configure a legal C-RP address range and the multicast group range to which the C-RP is designated on the BSR. In addition, because every C-BSR might become the BSR, you must configure the same filtering policy on all C-BSRs in the IPv6 PIM-SM domain. When you configure a C-RP, reserve a relatively large bandwidth between the C-RP and the other devices in the IPv6 PIM-SM domain. To configure a C-RP: Step Command 1. Enter system view. system-view 2. Enter IPv6 PIM view. ipv6 pim 3. Configure a C-RP. c-rp ipv6-address [ advertisement-interval adv-interval | { group-policy acl6-number | scope scope-id } | holdtime hold-time | priority priority ] * 4. (Optional.) Configure a legal C-RP address range and the IPv6 multicast group range to crp-policy acl6-number which the C-RP is designated. Remarks N/A N/A By default, no C-RP is configured. By default, no restrictions are defined. Configuring a BSR You must configure a BSR if C-RPs are configured to dynamically select the RP. In a network with a static RP, this configuration task is unnecessary. An IPv6 PIM-SM domain can have only one BSR, but must have at least one C-BSR. Any router can be configured as a C-BSR. Elected from C-BSRs, the BSR is responsible for collecting and advertising RP information in the IPv6 PIM-SM domain. Configuring a C-BSR C-BSRs should be configured on routers on the backbone network. The BSR election process is summarized as follows: • Initially, each C-BSR regards itself as the BSR of the IPv6 PIM-SM domain send BSMs to other routers in the domain. • When a C-BSR receives the BSM from another C-BSR, it compares its own priority with the priority carried in the message. The C-BSR with a higher priority wins the BSR election. If a tie exists in the priority, the C-BSR with a higher IPv6 address wins. The loser uses the winner's BSR address to replace its own BSR address and no longer regards itself as the BSR, and the winner retains its own BSR address and continues to regard itself as the BSR. In an IPv6 PIM-SM domain, the BSR collects C-RP information from the received advertisement messages from the C-RPs, encapsulates the C-RP information in the RP-set information, and distributes the RP-set information to all routers in the IPv6 PIM-SM domain. All routers use the same hash algorithm to get an RP for a specific IPv6 multicast group. 153

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153
does not receive any advertisement message when the timer expires, it regards the C-RP failed or
unreachable.
To guard against C-RP spoofing, you must configure a legal C-RP address range and the multicast group
range to which the C-RP is designated on the BSR. In addition, because every C-BSR might become the
BSR, you must configure the same filtering policy on all C-BSRs in the IPv6 PIM-SM domain.
When you configure a C-RP, reserve a relatively large bandwidth between the C-RP and the other devices
in the IPv6 PIM-SM domain.
To configure a C-RP:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IPv6 PIM view.
ipv6 pim
N/A
3.
Configure a C-RP.
c-rp
ipv6-address
[
advertisement-interval
adv-interval
| {
group-policy
acl6-number
|
scope
scope-id
}
|
holdtime
hold-time
|
priority
priority
] *
By default, no C-RP is configured.
4.
(Optional.) Configure a legal
C-RP address range and the
IPv6 multicast group range to
which the C-RP is designated.
crp-policy
acl6-number
By default, no restrictions are
defined.
Configuring a BSR
You must configure a BSR if C-RPs are configured to dynamically select the RP. In a network with a static
RP, this configuration task is unnecessary.
An IPv6 PIM-SM domain can have only one BSR, but must have at least one C-BSR. Any router can be
configured as a C-BSR. Elected from C-BSRs, the BSR is responsible for collecting and advertising RP
information in the IPv6 PIM-SM domain.
Configuring a C-BSR
C-BSRs should be configured on routers on the backbone network. The BSR election process is
summarized as follows:
•
Initially, each C-BSR regards itself as the BSR of the IPv6 PIM-SM domain send BSMs to other routers
in the domain.
•
When a C-BSR receives the BSM from another C-BSR, it compares its own priority with the priority
carried in the message. The C-BSR with a higher priority wins the BSR election. If a tie exists in the
priority, the C-BSR with a higher IPv6 address wins. The loser uses the winner’s BSR address to
replace its own BSR address and no longer regards itself as the BSR, and the winner retains its own
BSR address and continues to regard itself as the BSR.
In an IPv6 PIM-SM domain, the BSR collects C-RP information from the received advertisement messages
from the C-RPs, encapsulates the C-RP information in the RP-set information, and distributes the RP-set
information to all routers in the IPv6 PIM-SM domain. All routers use the same hash algorithm to get an
RP for a specific IPv6 multicast group.