648 CHAPTER 47: PIM CONFIGURATION
■ By default, the bootstrap timeout time is determined by this formula: Bootstrap
timeout = Bootstrap interval × 2 + 10. The default bootstrap interval is 60
seconds, so the default bootstrap timeout = 60 × 2 + 10 = 130 (seconds).
■ If this parameter is manually configured, the system will use the configured
value.
About the bootstrap interval
■ By default, the bootstrap interval is determined by this formula: Bootstrap
interval = (Bootstrap timeout - 10) / 2. The default bootstrap timeout is 130
seconds, so the default bootstrap interval = (130 - 10) / 2 = 60 (seconds).
■ If this parameter is manually configured, the system will use the configured
value.
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CAUTION: In configuration, make sure that the bootstrap interval is smaller than
the bootstrap timeout time.
Configuring an RP An RP can be manually configured or dynamically elected through the BSR
mechanism. For a large PIM network, static RP configuration is a tedious job.
Generally, static RP configuration is just a backup means for the dynamic RP
election mechanism to enhance the robustness and operation manageability of a
multicast network.
Configuring a static RP
If there is only one dynamic RP in a network, manually configuring a static RP can
avoid communication interruption due to single-point failures and avoid frequent
message exchange between C-RPs and the BSR. To enable a static RP to work
normally, you must perform this configuration on all the devices in the PIM-SM
domain and specify the same RP address.
Follow these steps to configure a static RP
Configuring a C-RP
In a PIM-SM domain, you can configure routers that intend to become the RP as
C-RPs. The BSR collects the C-RP information by receiving the C-RP-Adv messages
from C-RPs or auto-RP announcements from other routers and organizes the
information into an RP-set, which is flooded throughout the entire network. Then,
the other routers in the network calculate the mappings between specific group
ranges and the corresponding RPs based on the RP-set. We recommend that you
configure C-RPs on backbone routers.
To guard against C-RP spoofing, you need to configure a legal C-RP address range
and the range of multicast groups to be served on the BSR. In addition, because
To do… Use the command… Remarks
Enter system view system-view -
Enter PIM view pim -
Configure a static RP static-rp rp-address
[ acl-number ] [ preferred ]
Optional
No static RP by default
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