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Configuring IP Services
8-44
117356-B Rev. 00
Setting the External Advertisement Timer
After a connection is established, the BGP speaker uses one or more update
messages to send the entire IP routing table (compliant with local BGP export
policies). BGP, however, does
not
require the entire routing table to be sent again.
Therefore, the BGP speaker must keep a current version of the routing
information received from of all of its peers for as long as the connection to each
peer is valid. This information is updated via update messages whenever changes
occur.
By default, BGP examines the routing table for changes every 5 seconds. If a
change has occurred, BGP issues an update message on the connection.
You can use the BCC or Site Manager to specify a value for the external
advertisement timer.
Using the BCC
Navigate to a BGP peer-specific prompt and enter:
advertise-time
seconds
seconds
is an integer specifying how often BGP issues an update message on this
peer session.
For example, the following command sets the external advertisement timer to 20
seconds for the peer session established between interfaces 2.2.2.2 and 2.2.2.5:
peer/2.2.2.2/2.2.2.5/5#
advertise-time 20
peer/2.2.2.2/2.2.2.5/5#
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