HP 600 Series, Услуги и приложения

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This sequence of events is shown in figure 4. Both the “poll interval” and the
“interval between full polls” are configurable parameters, the values of
which should be set in accordance with the network provider’s subscription
parameters.
Figure 4. Interleaving of Full Status and Keep Alive Polls
Full Status When a router attached to a Frame Relay network is
initialized, the first message that the router sends to the network is a full
status poll. The network responds with a full status reply. The status
information returned by the network indicates which PVCs are available
for use. The full status reply lists each of the DLCIs available and
provides two bits of status information per DLCI. The first status bit is
called the “New” bit; the second status bit is called the “Active” bit.
Table 7 shows how these bits are used.
Frame Relay
Network
Poll
Interval
Interval
Between
Full Polls
R
Keep Alive Poll
Full Status Reply
Full Status Poll
Keep Alive Reply
TIME
Keep Alive Pole
Keep Alive Reply
Keep Alive Poll
Keep Alive Reply
Keep Alive Poll
Keep Alive Reply
Keep Alive Poll
Keep Alive Reply
Full Status Poll
Full Status Reply
Keep Alive Poll
Keep Alive Reply
Linking Up with Frame Relay
Local Management Interface
3-98