Huawei quidway s7700 - Configuring PIM GR; Establishing the Configuration Task

– display pim [ vpn-instance vpn-instance-name | all-instance ] bfd session
[ interface interface-type interface-number | neighbor neighbor-address ]
*
----End
6.13 Configuring PIM GR
In a PIM-SM network, PIM GR can be applied to a device with dual main control boards to
ensure normal multicast data forwarding during master-slave switchover.
6.13.1 Establishing the Configuration Task
After basic functions of PIM-SM are configured, you can configure PIM GR to improve PIM
network reliability.
Applicable Environment
In some multicast applications, the switch may need to perform active/standby switchover. After
active/standby switchover, the new active main control board deletes the forwarding entries on
the interface board and re-learns the PIM routing table and multicast routing table. During this
process, multicast traffic is interrupted.
In the PIM-SM/SSM network, PIM Graceful Restart (GR) can be applied to the switch with dual
main control boards to ensure normal multicast traffic forwarding during active/standby
switchover.
The active main control board of the switch backs up PIM routing entries and Join/Prune
information to be sent upstream to the standby main control board. The interface board maintains
forwarding entries. Therefore, after active/standby switchover, the switch can actively and fast
send Join messages upstream to maintain the Join state of the upstream. In addition, the PIM
protocol sends Hello message carrying new Generation ID to all switchs enabled with PIM-SM.
When the downstream switch finds that the Generation ID of its neighbor changes, it sends a
Join/Prune message to the neighbor for re-creating routing entires, thereby ensuring non-stop
forwarding of multicast data on the forwarding plane.
If a dynamic RP is used on the network, after receiving a Hello message with the Generation ID
being changed, the DR or candidate DR unicasts a BSM message to the switch performing active/
standby switchover and the switch learns and restores RP information based on the received
BSM message. If the switch has not leant any RP information from the BSM messages, it obtains
the RP information from the Join/Prune message received from the downstream router and re-
creates multicast routing table.
NOTE
PIM GR is applicable to PIM-SM/SSM networks.
Pre-configuration Tasks
Before enabling PIM GR, complete the following task:
l Configuring a unicast routing protocol and enabling unicast GR
l Configuring Basic PIM-SM Functions
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 6 PIM-SM (IPv4) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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