3com 5500-ei pwr Reference Guide

 

4-9 

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. 

# 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 

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.