■ Use to enable MD5 authentication on a TCP connection between two BGP peers.
■ If you configure a password for a neighbor, an existing session is torn down and
a new one established.
■ If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command unless it is overridden for a specific peer.
■ If a router has a password configured for a neighbor, but the neighbor router
does not, a message indicating this condition appears on the console while the
routers attempt to establish a BGP session between them.
■ Similarly, if the two routers have different passwords configured, a message
appears on the console indicating that this condition exists.
■ Use the 8 keyword to indicate that the password is encrypted (entered in
ciphertext). Use the 0 keyword to indicate that the password is unencrypted
(entered in plaintext).
■ This command takes effect immediately and automatically bounces the BGP
session.
■ Use the no version to disable MD5 authentication.
■ See neighbor password
Setting the Maximum Size of Update Messages
You can use the neighbor maximum-update-size command to set the maximum
size of update messages transmitted to a BGP peer.
For example, to set the maximum update size to 2,000 octets:
host1(config)#router bgp 100
host1(config-router)#neighbor 10.12.2.5 maximum-update-size 2000
neighbor maximum-update-size
■ Use to set the maximum size for transmitted BGP update messages.
■ Set the maximum-update-size to a range: 256–4096.
■ The default is 1024 octets.
■ If you specify a BGP peer group by using the peerGroupName argument, all the
members of the peer group inherit the characteristic configured with this
command unless it is overridden for a specific peer.
■ BGP always accepts updates of up to 4096 octets, regardless of the setting for
transmitted updated messages.
■ Applies to all update messages sent after you issue the command.
■ Use the no version to restore the default value.
■ See neighbor maximum-update-size.
Configuring BGP Peer Groups ■ 37
Chapter 1: Configuring BGP Routing
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