12.7 Adjusting Control Parameters for State-Refresh
In a PIM-DM network, the periodic flooding-pruning wastes lots of network resources. To
prevent the pruned interface from forwarding messages because the prune timer times out, you
can enable the State-Refresh function to enable the multicast device to send State-Refresh
messages periodically, refresh the prune state of the interface, and maintain SPT.
12.8 Adjusting Control Messages for Graft
To enable 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.
12.9 Adjusting Control Messages for Assert
If a multicast device can receive multicast data through the downstream interface, this indicates
that other upstream devices exist in this network segment. The device then sends an Assert
message through the downstream interface to take part in the election of the unique upstream
device.
12.10 Configuring PIM-IPv6 Silent
The interface directly connecting a multicast device to a user host needs to be enabled with PIM.
In this case, some malicious hosts may simulate a large number of PIM Hello messages and send
the messages to the interface for processing. As a result, the multicast device is suspended. To
avoid the preceding case, you can set the interface to be in the PIM Silent state.
12.11 Maintaining PIM-DM
Maintaining IPv6 PIM-DM involves resetting PIM statistics, and monitoring PIM running status.
12.12 Configuration Example
Configuration examples are provided to show how to construct a basic IPv6 PIM-DM network.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 12 PIM-DM (IPv6) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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