6.9.1 Establishing the Configuration Task
After basic functions of PIM-SM are configured, you can adjust related control parameters of
forwarding relationship maintenance, and configure the Join information filtering and neighbor
filtering functions to enhance security as required.
Applicable Environment
The configurations in this section are applicable to the ASM model and the SSM model.
When the first member of a group appears in the network segment, the switch sends a Join
message through an upstream interface, requiring the upstream switch to forward packets to the
network segment.
When the last member of the group leaves, the switch sends a Prune message through an upstream
interface, requiring the upstream switch to perform the Prune action and to stop forwarding
packets to this network segment. If other downstream switchs in this network segment still want
to receive data of this group, they must send a Join message to override the Prune action.
In the ASM model, a switch periodically sends Join messages to the RP to prevent RPT branches
from being deleted due to timeout.
The switch can work normally under the control of default values. The S7700 allows users to
adjust the parameters as required.
NOTE
It is recommended to adopt default values if there is no special requirement.
Pre-configuration Tasks
Before adjusting control parameters for forwarding, complete the following tasks:
l Configuring a certain unicast routing protocol
l Configuring Basic PIM-SM Functions
Data Preparation
To adjust control parameters for forwarding, you need the following data.
No.
Data
1 Delay for transmitting Prune messages
2 Period of overriding the Prune action
3 Timeout period of the Prune state
4 Interval for sending Join messages
5 Number or name of the ACL used to filter join information in the Join/Prune messages
6 Whether neighbor check needs to be performed after Join/Prune message and Assert
messages are sent or received
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.
175
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