Avaya Configuring IP Services Uživatelský manuál stáhnout pdf (Strana 268)

100

101

Configuring IP Services

6-8

Figure 6-3. Neighbor Reachability Exchange Begins between Two EGP

Neighbors

When Router B sends its ﬁrst Hello message, Router A transitions to the UP State.

Router A responds to the Hello message with an I-H-U; however, Router B does

not yet transition to the UP state. As an active router, it must receive 3

I-H-Us within a speciﬁed time (in this case 2.5 minutes, or 5 * 30 seconds) before

transitioning to the UP state. Upon receipt of the third I-H-U within the speciﬁed

time interval, Router B transitions to the UP state (see Figure 6-4). At this point,

neighbor reachability is established.

ASN = 50 Hello = 30 Poll = 120

Mode = Passive

Router A

ASN = 51 Hello = 30

Poll = 240

Mode = Active

Router B

State = UP

State = Down

Passive Router A

transitions to the

UP state.

I-H-U

First

Hello Command

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