Avaya Configuring IP Services Bedienungsanleitung Seite 214

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Configuring IP Services
5-10
Over switched virtual circuits, a Holdtime of zero can be used. This disables
the transmission of periodic Keepalive messages on the connection so that the
virtual circuit can go idle. While this can result in cost savings for line usage,
it also makes it more difficult for either BGP speaker to determine, in a timely
manner, whether the BGP connection has gone down.
The BGP Identifier, which is the IP address of the transmitting BGP speaker.
A BGP speaker sets the BGP identifier to the IP address of one of its
interfaces. It uses the same identifier in all the Open messages on every
connection.
The Authentication Code, which indicates the authentication mechanism in
use. Currently, only the null authentication mechanism is defined. Therefore,
this field must be set to 0.
Authentication Data, a field with variable length and contents depending on
the value of the Authentication Code field. Currently, this field must be nil,
because only the null authentication mechanism is defined.
Keepalive Message
The Keepalive message has two functions. First, it is used as a confirmation of the
Open message when a connection between two BGP speakers is being
established. Second, it is used to keep the hold timer from expiring and the
connection from going down when there has been no other BGP message sent
over the connection for a while. The periodic transmission of the Keepalive
message is regulated by the Keepalive timer.
A Keepalive message consists only of the common BGP header.
Update Message
The Update message is used to transfer current routing information between BGP
peers. It describes routes from the transmitting BGP speaker to a list of destination
networks. Each destination is listed, and the path to the set of destinations is
described using path attributes.
Note: If OSPF is running on the same router, and BGP-3 routes are advertised
as OSPF external routes, the BGP identifier and the OSPF router ID must be
identical.
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