
Configuring EGP Services
6-3
Neighbor Acquisition Phase
This portion of 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.
Certain messages that are used in the Neighbor Acquisition phase include the
following:
• Neighbor Acquisition Request
This is the message that one router sends to another to request the formation
of a neighbor relationship. The requesting router includes its
— Autonomous system number
— Acquisition mode
— Hello interval that it will accept from the peer
— Poll interval that it will accept from the peer
• Neighbor Acquisition Confirm Response
This message is sent in response to a Neighbor Acquisition Request when the
router agrees to being acquired; that is, it is willing to form the neighbor
relationship. The responding router includes its
— Autonomous system number
— Acquisition mode
— Hello interval that it will accept from the peer
— Poll interval that it will accept from the peer
• Neighbor Acquisition Refuse Response
This message is sent in response to a Neighbor Acquisition Request when the
router does not agree to be acquired; that is, it will not form the neighbor
relationship. The status field of the Neighbor Acquisition Refuse message
header supplies the reason for the refusal.
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