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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 45 Configuring MSDP
Configuring MSDP
To remove the default peer, use the
no ip msdp default-peer
ip-address
|
name
global configuration
command.
This example shows a partial configuration of Router A and Router C in
. Each of these ISPs
have more than one customer (like the customer in
) who use default peering (no BGP or
MBGP). In that case, they might have similar configurations. That is, they accept SAs only from a default
peer if the SA is permitted by the corresponding prefix list.
Router A
Router(config)#
ip msdp default-peer 10.1.1.1
Router(config)#
ip msdp default-peer 10.1.1.1 prefix-list site-a
Router(config)#
ip prefix-list site-b permit 10.0.0.0/1
Router C
Router(config)#
ip msdp default-peer 10.1.1.1 prefix-list site-a
Router(config)#
ip prefix-list site-b permit 10.0.0.0/1
Caching Source-Active State
By default, the switch does not cache source/group pairs from received SA messages. When the switch
forwards the MSDP SA information, it does not store it in memory. Therefore, if a member joins a group
soon after a SA message is received by the local RP, that member needs to wait until the next SA
message to hear about the source. This delay is known as join latency.
If you want to sacrifice some memory in exchange for reducing the latency of the source information,
you can configure the switch to cache SA messages.
Step 3
ip prefix-list
name
[
description
string
] |
seq
number
{
permit
|
deny
}
network
length
(Optional) Create a prefix list using the name specified in Step 2.
•
(Optional) For
description
string
, enter a description of up to 80
characters to describe this prefix list.
•
For
seq
number,
enter the sequence number of the entry. The range
is 1 to 4294967294.
•
The
deny
keyword denies access to matching conditions.
•
The
permit
keyword permits access to matching conditions.
•
For
network length
, specify the network number and length (in bits)
of the network mask that is permitted or denied.
Step 4
ip msdp description
{
peer-name
|
peer-address
}
text
(Optional) Configure a description for the specified peer to make it
easier to identify in a configuration or in
show
command output.
By default, no description is associated with an MSDP peer.
Step 5
end
Return to privileged EXEC mode.
Step 6
show running-config
Verify your entries.
Step 7
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
