395
MRIB view.
3.
Return to system view.
quit
N/A
4.
Enter interface view.
interface interface-type
interface-number
N/A
5.
Enable IPv6 PIM-SM.
ipv6 pim sm
By default, IPv6 PIM-SM is
disabled.
Configuring an RP
An RP can provide services for multiple or all IPv6 multicast groups. However, only one RP at a time
can forward IPv6 multicast traffic for an IPv6 multicast group.
An RP can be manually configured or dynamically elected through the BSR mechanism. For a
large-scaled IPv6 PIM network, configuring static RPs is a tedious job. Generally, static RPs are
backups for dynamic RPs to enhance the robustness and operational manageability on an IPv6
multicast network.
Configuring a static RP
If only one dynamic RP exists on a network, you can configure a static RP to avoid communication
interruption caused by single-point failures. The static RP can also avoid waste of bandwidth due to
frequent message exchange between C-RPs and the BSR.
When you configure static RPs, follow these restrictions and guidelines:
•
You can configure the same static RP for different IPv6 multicast groups by using the same RP
address but different ACLs.
•
You do not need to enable IPv6 PIM for an interface to be configured as a static RP.
•
If you configure multiple static RPs for an IPv6 multicast group, only the static RP with the
highest IPv6 address takes effect.
•
You must configure the same static RP on all routers in the IPv6 PIM-SM domain.
To configure a static RP:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IPv6 PIM view.
ipv6 pim
[
vpn-instance
vpn-instance-name
]
N/A
3.
Configure a static RP for
IPv6 PIM-SM.
static-rp ipv6-rp-address
[
ipv6-acl-number
|
preferred
] *
By default, no static RPs exist.
Configuring a C-RP
In an IPv6 PIM-SM domain, if you want a router to become the RP, you can configure the router as a
C-RP. As a best practice, configure C-RPs on backbone routers.
The C-RPs periodically send advertisement messages to the BSR, which collects RP-set information
for the RP election. You can configure the interval for sending the advertisement messages.
The holdtime option in C-RP advertisement messages defines the C-RP lifetime for the advertising
C-RP. The BSR starts a holdtime timer for a C-RP after it receives an advertisement message. If the
BSR does not receive any advertisement message when the timer expires, it considers the C-RP
failed or unreachable.
A C-RP policy enables the BSR to filter C-RP advertisement messages by using an ACL that
specifies the packet source address range and multicast group addresses. You must configure the