Adjusting Control Parameters For Graft; Establishing The Configuration Task; Configuring The Interval For Retransmitting Graft Messages - Huawei Quidway s3700 series Configuration Manual

Quidway S3700 Series Ethernet Switches
Configuration Guide - Multicast

6.8 Adjusting Control Parameters for Graft

To make new members in a network to quickly receive multicast data, a multicast device actively
sends a Graft message through an upstream interface, requesting the upstream device to forward
multicast data to this network segment.

6.8.1 Establishing the Configuration Task

After basic functions of PIM-DM are configured, you can set the interval for retransmitting Graft
messages as required.
Applicable Environment
In a PIM-DM network, if State-Refresh is not enabled, a pruned interface can forward packets
after the Prune state times out. If State-Refresh is enabled, the pruned interface may never
forward packets.
To enable new members in the network to receive multicast data quickly, a PIM-DM switch
sends a Graft message through an upstream interface. After receiving the Graft message, the
upstream switch responds immediately with a Graft-Ack message and enables the interface that
receives the Graft message to forward packets.
Switchs can work normally under the control of the default parameter values. Users can adjust
the related parameters according to the specific network environment.
Pre-configuration Task
Before configuring control parameters for graft, complete the following tasks:
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Data Preparation
To configure control parameters for graft, you need the following data.
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6.8.2 Configuring the Interval for Retransmitting Graft Messages

In PIM-DM mode, when a member joins a pruned group, the multicast device sends a Graft
message and waits for an ACK message from the upstream device. If the downstream device
does not receive any ACK message within a certain period, the device resends the Graft message
until it receives an ACK message from the upstream device.
Issue 01 (2011-10-26)
NOTE
If there is no specific requirement, default values are recommended.
Configuring a unicast routing protocol
Configuring Basic PIM-DM Functions
Data
Interval for retransmitting Graft messages
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