3Com 5500-EI PWR, Reference Manual

Page: 443 / 1314

4-9
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.
Examples
# Specify the maximum number of hops to be traced and collect the detailed SA and MSDP peer
information.
<Sysname> 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 4-5 msdp-tracert command output description
Field Description
Router Address
The address used by the local switch to establish
a peering session with the Peer-RPF neighbor
Peer Uptime
The time of the peering session between the
local switch and a Peer-RPF neighbor, in
minutes. The maximum value is 255.
Cache Entry Uptime
Up time of the (S, G, RP) entry in SA cache of the
local switch, in minutes. The maximum value is
255.
D-bit: 1
An (S, G, RP) entry exists in the SA cache of the
local switch, but the RP is different from the RP
specified in the request message.
RP-bit: 1
The local switch is an RP, but it may be another
RP than the source RP in the (S, G, RP) entry.
NC-bit: 0 SA cache is enabled on the local switch.
C-bit: 1
An (S, G, RP) entry exists in SA cache of the
local switch.