Huawei quidway s7700 - Configuring Switch-MDT Switchover; Establishing the Configuration Task

Procedure
l Run the display multicast-domain vpn-instance vpn-instance-name share-group
[ local | remote ] command to check Share-Group information of a specified VPN instance
in an MD.
l Run the display pim vpn-instance vpn-instance-name interface mtunnel interface-
number [ verbose ] command to check information about an MTI.
----End
8.4 Configuring Switch-MDT Switchover
When multicast data packets are forwarded through the share-MDT in the public network, the
packets are forwarded to all PEs in the same VPN instance. Therefore, the high rate of multicast
data packets in the VPN will increase the burden on the PE. To solve this problem, you can
configure share-MDT and switch-MDT switchover to implement on-demand multicast, thereby,
saving bandwidth resource on the network.
8.4.1 Establishing the Configuration Task
Before configuring share-MDT and switch-MDT switchover, familiarize yourself with the
applicable environment, pre-configuration tasks, and required data. This can help you complete
the configuration task quickly and accurately.
Applicable Environment
When multicast data packets are forwarded through the share-MDT in the public network, the
packets are forwarded to all PEs that support the same VPN instance, regardless of whether there
is a receiver in the site to which a PE is connected. When the rate for forwarding VPN multicast
data packets is high, the packets may be flooded in the public network. This wastes network
bandwidth and increases the load of PEs.
In the S7700, you can determine whether to perform Switch-MDT switchover. If Switch-MDT
switchover is not configured, MDs use Share-MDT to transmit VPN multicast data forever.
l When the rate of the VPN multicast data entering the public network exceeds the threshold,
the VPN multicast data can be switched from Share-MDT to a specified Switch-MDT. On-
demand multicast is thus implemented.
l After the VPN multicast data is switched to the switch-MDT, the switchover conditions
may not be met. In this case, the VPN multicast data can be reversely switched from Switch-
MDT to Share-MDT.
Pre-configuration Tasks
Before configuring Switch-MDT switchover, complete the task of Configuring Basic MD VPN
Functions.
Data Preparation
To configure Switch-MDT switchover, you need the following data.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 8 IPv4 Multicast VPN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
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