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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
Chapter 43 Configuring MSDP
Configuring MSDP
Beginning in privileged EXEC mode, follow these steps to specify a default MSDP peer. This procedure
is required.
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 Figure 43-2. Each of these ISPs
have more than one customer (like the customer in Figure 43-2) 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.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip msdp default-peer ip-address | name
[prefix-list list]
Define a default peer from which to accept all MSDP SA messages.
• For ip-address | name, enter the IP address or Domain Name
System (DNS) server name of the MSDP default peer.
• (Optional) For prefix-list list, enter the list name that specifies the
peer to be the default peer only for the listed prefixes. You can have
multiple active default peers when you have a prefix list associated
with each.
When you enter multiple ip msdp default-peer commands with the
prefix-list keyword, you use all the default peers at the same time
for different RP prefixes. This syntax is typically used in a service
provider cloud that connects stub site clouds.
When you enter multiple ip msdp default-peer commands without
the prefix-list keyword, a single active peer accepts all SA
messages. If that peer fails, the next configured default peer accepts
all SA messages. This syntax is typically used at a stub site.
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.
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