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Configuring Frame Relay Services

2-10

117376-C Rev. 00

LAPF Timeout and Retransmission Timers

Table 2-2 lists the timers and retransmission limits defined in the LAPF protocol

for timeouts and retransmissions.

Timer T200

Timer T200 detects transmission timeouts. When a timeout occurs, the peer enters

the timer recovery state and retransmits the frame, up to a maximum of N200

times. If this limit is reached, the system performs the following operations:

• Terminates multiple frame operation

• Discards all outstanding information frames

• Transitions the peer to the TEI-assigned state

• Initiates multiple frame setup

If the remote peer receives a frame that contains an error, it sends an REJ message

to specify which frame was in error. In response, the local peer retransmits

information frames, beginning with the bad frame.

If the remote peer encounters an error which retransmission cannot remedy, it

sends an FRMR response to the local peer and transitions to the TEI-assigned

state. The local peer discards all outstanding information frames, transitions to the

TEI-assigned state, and initiates multiple frame setup.

Table 2-2. LAPF Timeout and Retransmission Timers

Site Manager Parameter Description

T200 This general purpose retransmission timeout is

used during initiation of LAPF multiple frame

support and for timeout of numbered information

frames.

T203 This timeout detects excessive idle time on the

line and initiates a frame handshake to check if

the connection is still up.

N200 This maximum retransmission count, when

reached, causes the software to take action. The

action take by the router software depends on the

type of message timed out and the state of the

service.

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 40