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Configuring IP Services
7-4 114065 Rev. A
In the neighbor reachability phase, EGP is responsible for monitoring and
maintaining an established EGP neighbor relationship between two routers. Its
purpose is to ensure that the neighbors are operational and can provide reliable
network reachability information. Two neighbors will be able to exchange
network reachability information only if they are both in the UP state and know
that they are both in the UP state. This is the point at which neighbor reachability
is positively determined.
In the network reachability phase, EGP is responsible for determining which
networks are reachable through two EGP neighbors; that is, it provides the
network reachability information. This information provides a list of gateways,
the networks those gateways can reach, and their associated distances.
Two neighbors determine network reachability by exchanging Poll messages and
Routing Update responses as described below:
The active neighbor sends a Poll message to a passive neighbor that it already
knows to be reachable. The Poll message requests routing information from
the passive neighbor.
The Routing Update Response is the message that contains the routing
information (the list of gateways on the common network, the networks they
can reach, and associated distances). Both active and passive neighbors can
send Routing Update messages. The active neighbor usually sends a Routing
Update Response after it sends a Poll message. The passive neighbor usually
sends a Routing Update Response in response to a Poll message.
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