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596 CHAPTER 31: MSDP CONFIGURATION
Displaying and
Debugging MSDP
Configuration
After the above-mentioned configuration, you can use the display command in any
view to view the MSDP running information, so as to verify configuration result.
In the user view, you can execute the reset command to reset the MSDP counter.
Tracing the transmission path of an SA message over the network
You can use the msdp-tracert command in any view to trace the path along which
the multicast data travels from the multicast source to the destination receiver over
the network, so as to locate errors, if any.
You can locate message loss and configuration errors by tracing the network path of
the specified (S, G, RP) entries. Once the transmission path of SA messages is
determined, correct configuration can prevent the flooding of SA messages.
MSDP Configuration
Example
This section contains an MSDP configuration example.
Configuration
Example of Anycast
RP Application
Network requirements
Each PIM-SM network is a single-BSR administrative domain, with multiple multicast
sources (S) and receivers. With Anycast RP configured in each PIM-SM domain, when
a new member joins the multicast group, the switch directly connected to the receiver
can send a Join message to the nearest RP on the topology.
Configure the maximum
number of SA messages
cached
peer peer-address
sa-cache-maximum sa-limit
Optional
By default, the maximum number of
SA messages cached on a router is
2,048.
Table 652 Configure SA message cache (continued)
Operation Command Description
Table 653 Display and debug MSDP configuration
Operation Command
Display the brief information of MSDP peer
state
display msdp brief
Display the detailed information of MSDP peer
state
display msdp peer-status [ peer-address ]
Display the (S, G) state learned from MSDP
peers
display msdp sa-cache [ group-address | [
source-address ] ] [autonomous-system-number ]
Display the number of sources and groups in
the MSDP cache
display msdp sa-count
[autonomous-system-number ]
Reset the TCP connection with the specified
MSDP peer
reset msdp peer peer-address
Clear the cached SA messages reset msdp sa-cache [ group-address ]
Clear the statistics information of the specified
MSDP peer without resetting the MSDP peer
reset msdp statistics [ peer-address ]
Table 654 Trace the transmission path of an SA message over the network
Operation Command
Trace the transmission
path of an SA message
over the network
msdp-tracert source-address group-address rp-address [ max-hops
max-hops ] [ next-hop-info | sa-info | peer-info ]* [ skip-hops
skip-hops ]