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Customizing EGP Services
114065 Rev. A 7-3
An EGP router
Acquires EGP neighbors
Determines neighbor reachability
Exchanges network reachability information with its neighbors
Each of these capabilities has an associated phase in EGP: the Neighbor
Acquisition phase, the Neighbor Reachability phase, and the Network
Reachability phase, respectively.
In the acquisition phase, EGP is responsible for forming neighbor relationships
between routers that are peers. Routers that are peers each have an interface to a
common network. One router attempts to acquire a peer router. If the peer agrees
to be acquired, the two routers form a neighbor relationship. They then negotiate
the mode of operation and the polling modes.
Once two routers agree to form a neighbor relationship, they must then negotiate
modes. According to EGP, the routers’ modes are determined as shown in
Table 7-1.
Table 7-1 shows all possible acquisition mode combinations that are available
when you configure the EGP neighbors at each end of a connection. However, it is
recommended that one router be configured in the Active acquisition mode and
the other in the Passive acquisition mode.
Table 7-1. Router Mode Determinator
Router A Router B Resulting Modes
Active Passive Router A is active; Router B is passive.
Passive Passive Not allowed.
Active Active The router with the lower autonomous system
number becomes active; the other becomes the
passive router.
Both Active Router A is passive; Router B is active.
Both Passive Router A is active; Router B is passive.
Both Both The router with the lower autonomous system
number becomes active; the other becomes the
passive router.
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