Command Manual – Multicast Protocol
Quidway S3900 Series Ethernet Switches-Release 1510 Chapter 7 MSDP Configuration Commands
Huawei Technologies Proprietary
7-8
Description
Use the msdp-tracert command to trace the path along which an SA message travels,
so as to locate message loss and minimize configuration errors. After determining the
path of the SA message, you can prevent SA flooding through correct configuration.
By default, the number of skipped hops before the switch collects the detailed
information is 0.
Example
# Trace path information of (10.10.1.1, 225.2.2.2, 20.20.20.20).
<Quidway> msdp-tracert 10.10.1.1 225.2.2.2 20.20.20.20
# Specify the maximum number of hops to be traced and collect the detailed SA and
MSDP peer information.
<Quidway> 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
C-bit: set if this (S,G,RP) tuple is in the cache
MSDP trace route path information:
Router Address: 20.20.1.1
Fixed-length response info:
Peer Uptime: 10 minutes, Cache Entry Uptime: 30 minutes
D-bit: 0, RP-bit: 1, NC-bit: 0, C-bit: 1
Return Code: Reached-max-hops
Next Hop info:
Next-Hop Router Address: 0.0.0.0
SA info:
Count of SA messages received for this (S,G,RP): 0
Count of encapsulated data packets received for this (S,G,RP):0
SA cache entry uptime: 00:30:00 , SA cache entry expiry time: 00:03:32
Peering info:
Peering Uptime: 10 minutes, Count of Peering Resets: 3
Table 7-4 Description on the fields of the msdp-tracert command
Field Description
Router Address
The address used by the local router to establish an
peering session with the Peer-PRF neighbor
Peer Uptime
The time of the peering session between the local router
and a Peer-RPF neighbor, in minutes. The maximum value
is 255.
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