Configuring Multicast Trace; Figure 15-18 Multicast Trace Principle; Figure 15-19 Multicast Trace Configuration Example - Zte ZXR10 ZSR V2 Configuration Manual (System Management

ZXR10 ZSR V2 Configuration Guide (System Management)

15.10 Configuring Multicast Trace

Overview
Multicast trace provides a method of monitoring multicast routes and detecting RPF.
At present, the multicast trace version is v1.0. Multicast trace checks connectivity of a
multicast path by sending and receiving IGMP protocol packets.
Multicast trace is used to detect the reversed path from a destination address to a multicast
source. It uses two methods to search for a next hop route. One is by RPF. The other is
by an (S, G) or (*, G) entity, and (S, G) is preferred.
Take Figure 15-18

Figure 15-18 Multicast Trace Principle

l
When trace 1.1.1.3 2.2.2.2 is configured on R1, R1 finds that the next hop is 1.1.1.1
through RPF. Until finding that the next hop route 1.1.1.3 is a source direct-connected
route, R1 unicasts the destination route 2.2.2.2.
l When trace 1.1.1.3 2.2.2.2 224.1.1.1 is configured on R1, R1 searches for the next
hop route by an (S, G) or (*, G) entity. (S, G) is preferred. Until finding that the next
hop route 1.1.1.3 is a source direct-connected route, R1 unicasts the destination route
2.2.2.2.
Configuration Commands
To configure multicast trace on ZXR10 ZSR V2, use the following command.
Command
mtrace <source-address>[<destination-address>][<g
ZXR10#
roup-address>]
Configuration Example
l
Configuration Description
It is required to search for a next hop route through an (S, G) or (*, G) entity. The
network topology is shown in

Figure 15-19 Multicast Trace Configuration Example

SJ-20140504150128-007|2014-05-10 (R1.0)
as an example to describe two multicast trace working flows.
Figure
15-30
Function
This displays the reversed path from a
destination address to a multicast source.
15-19.
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