Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 265)

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101

Configuring EGP Services

6-5

Table 6-1 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.

As an example of a neighbor acquisition, consider Routers A and B in Figure 6-2.

Router A attempts to acquire Router B by sending an Acquisition Request

message to Router B. Router B agrees to form the neighbor relationship with

Router A by responding with an Acquisition Conﬁrm message.

Figure 6-2. Neighbor Acquisition Sequence

Router B becomes the active router because its conﬁgured acquisition mode was

Active and Router A’s conﬁgured mode was Passive (refer to Table 6-1). This

means that Router B, as the active router, will later be responsible for sending

Hello packets and Poll messages, and Router A will respond to Router B.

Had Router B sent an Acquisition Refuse Response, no relationship would have

been formed. Also, at any time after the neighbor relationship is formed, either

Router A or Router B could send an Acquisition Cease message. This would

terminate the neighbor relationship between them.

ASN = 50 Hello = 30

Poll = 120 Mode = Passive

Router A

NeighborAcquisition

Request

NeighborAcquisition

Conﬁrm

ASN = 51 Hello = 30

Poll = 240 Mode = Active

Router B

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