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Defining X.25 Parameters

Your network may require some adjustment to the values set by default for X.25 operation. The following are CLI commands for defining the packet layer parameter values.

Command

Range of Values

Default Value

Description

define x25 parameters ackDelayTimer

Integer (0..65535)

500

Select the amount of time (in milliseconds) that the packet layer will wait before acknowledging a received data packet. 0 means the packet layer will immediately acknowledge all received data packets.

define x25 parameters callTimer

Integer

200000

The T21 call timer, in milliseconds. See RFC 1382.

define x25 parameters clearTimer

Integer

180000

The T23 clear timer, in milliseconds. See RFC 1382.

define x25 parameters clearCount

Integer (0..65535)

1

The R23 clear retransmission count. See RFC 1382.

define x25 parameters dbitAction

plp | application

application

Select whether the application is required to acknowledge packets with the d-bit size, or whether the packet layer (plp) can acknowledge the packets.

define x25 parameters hicChannel

Integer (0..4095)

0

The highest incoming channel number. 0 means no channels are reserved for this range.

define x25 parameters hocChannel

Integer (0..4095)

0

The highest outgoing channel number. 0 means no channels are reserved for this range.

define x25 parameters htcChannel

Integer (0..4095)

64

The highest two-way channel number. 0 means no channels are reserved for this range.

define x25 parameters interfaceMode

dte | dce

dce

Select whether the packet layer is to operate in DTE or DCE mode. Make sure that one end of the X.25 connection is set for DCE operation and the other end is set for DTE operation.

define x25 parameters licChannel

Integer (0..4095)

0

The lowest incoming channel number. 0 means no channels are reserved for this range.

define x25 parameters locChannel

Integer (0..4095)

0

The lowest outgoing channel number. 0 means no channels are reserved for this range.

define x25 parameters ltcChannel

Integer (0..4095)

1

The lowest two-way channel number. 0 means no channels are reserved for this range.

define x25 parameters locDefPcktSize

Integer (16, 32, 64, 128, 256, 512, 1024, 2048)

128

The default packet size for this interface.

define x25 parameters locDefWSize

Integer (1..7)

2

The default window size for this interface.

define x25 parameters locMaxPcktSize

Integer (16, 32, 64, 128, 256, 512, 1024, 2048)

1024

The maximum negotiated packet size that will be accepted by this interface.

define x25 parameters locMaxWSize

Integer (1..7)

7

The maximum negotiated window size that will be accepted by this interface.

define x25 parameters maxActiveCircuits

Integer (0..4095)

32

The maximum number of active circuits this interface can support.

Note: the maximum number of virtual circuits the Passport 4400 unit can support, PVC and SVC combined, is 96.

define x25 parameters numberPVCs

Integer (0..4095)

0

The number of PVCs configured for this interface.

define x25 parameters packetSequencing

8modulo

8modulo

Specifies the modulus of the packet layer sequence numbers.

define x25 parameters remMaxPcktSize

Integer (16, 32, 64, 128, 256, 512, 1024, 2048)

1024

The maximum negotiated packet size that will be accepted by the remote interface.

define x25 parameters remMaxWSize

Integer (1..7)

7

The maximum negotiated window size that will be accepted by the remote interface.

define x25 parameters remDefPcktSize

Integer (16, 32, 64, 128, 256, 512, 1024, 2048)

128

The default packet size for the remote interface.

define x25 parameters remDefWSize

Integer (1..7)

2

The default window size for the remote interface.

define x25 parameters resetCount

Integer (0..65535)

1

The R22 reset retransmission count. See RFC 1382.

define x25 parameters resetTimer

Integer

180000

The T22 reset timer, in milliseconds. See RFC 1382.

define x25 parameters restartCount

Integer (0..65535)

1

The R20 restart transmission counter. See RFC 1382.

define x25 parameters restartTimer

Integer

180000

The T20 restart timer, in milliseconds. See RFC 1382.

define x25 parameters versionSupported

x80, x84, x88

x88

Select the level of protocol compliance with the X.25 standards.



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