number of downstream nodes of a single forwarding entry. Limiting the number of
downstream nodes according to the actual networking and service performance can reduce
the processing pressure of a switch and control the multicast service range.
Testing Multicast Routing
When a fault occurs on a multicast network, you can run the ping multicast and mtrace
commands to test the connectivity of the network.
NOTE
The mtrace command can be used to trace multicast path on a specified multicast VPN network to maintain
multicast VPN services and locate faults on the network.
The ping multicast command is used to check whether a group is reachable and to implement
the following functions:
l Pinging a reserved group address
This is used to check whether a member of a group exists in the directly connected network
segment, and is not exclusive for multicast networks. You can ping devices that use
multicast addresses.
l Pinging a common group address
This function is applied as follows:
– To generate multicast traffic and trigger the creation of multicast routing entries: Based
on multicast routing information, you can check whether a protocol runs normally,
determine whether the network can carry multicast services, or test the forwarding
performance.
– To check the members of related groups in the network: Based on the ICMP-Echo-
Reply messages received from destination hosts, the switch on which the command is
used checks the members of the groups in the network, and calculates response time
and the TTL from the switch to members. You can run the command repeatedly in a
certain interval to calculate the network delay and route flapping.
The mtrace command can be used to trace the following paths and output the hop information:
l RPF path from a source to a querier
l Multicast path from a source to a querier
l RPF path from a source to a destination host
l Multicast path from a source to a destination host
NOTE
You can ping multicast addresses by using the Network Quality Analysis (NQA) test instances or related
commands. For detailed configurations of NQA test instances, refer to the chapter " NQA Configuration
" in Quidway S7700 Smart Routing Switch Configuration Guide - Network Management.
9.3 Configuring a Static Multicast Route
Static multicast routes have the functions of changing RPF routes and connecting RPF routes.
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 9 IPv4 Multicast Routing Management
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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