Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 4 MSDP Configuration Commands
3Com Corporation
4-7
[3Com] undo msdp
4.1.9 msdp-tracert
Syntax
msdp-tracert source-address group-address rp-address [ max-hops max-hops ]
[ next-hop-info ] [ sa-info ] [ peer-info ] [ skip-hops skip-hops ]
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Parameter
source-address: Multicast address address.
group-address: Multicast group address.
rp-address: IP address of RP.
max-hops: The maximum number of hops that are traced, ranging from 1 to 255. By
default, the value is 16.
next-hop-info: Flag bit for collecting the next hop information.
sa-info: Flag bit for collecting SA entity information.
peer-info: Flag bit for collecting MSDP peer information.
skip-hops: Number of hops that are skipped before collecting detailed information,
ranging from 0 to 255. By default, the value is 0.
Description
Use the msdp-tracert command to trace the transmission path of SA messages in the
network, which helps to locate the faults such as information loss and configuration
error. After the transmission path of SA messages is determined, correct configuration
can avoid the overflow of SA messages.
Example
# Trace (10.10.1.1, 225.2.2.2, 20.20.20.20) path information.
<3Com> msdp-tracert 10.10.1.1 225.2.2.2 20.20.20.20
# Specify the maximum number of hops that are traced and collect detailed information
of SA and MSDP peer.
<3Com> msdp-tracert 10.10.1.1 225.2.2.2 20.20.20.20 max-hops 10 sa-info
peer-info
MSDP tracert: press CTRL_C to break
D-bit: set if have this (S,G) in cache but with a different RP
RP-bit: set if this router is an RP
NC-bit: set if this router is not caching SA's