IBM SC30-3681-08 Link group-poll, Link idle ¯ag, Link idle mark, Link inactivity #-of-seconds

Con®guring SDLC Interfaces

Table 70. Valid Values for Frame Size in Link Frame-Size Command

Minimum	Maximum	Default
128	18000	2048

Set the link frame size greater than the maximum packet size that you con®gured with theset station xxx max packet command. Otherwise, the router automatically resets the maximum packet size to the link frame size and issues the following ELS message:

SDLC.054: nt 3 SDLC/0 Stn xx-MaxBTU too large for Link adjusted (4096->2048)

Example: set link frame-size

Frame size in bytes (128 - 18000)[2048]?

link group-poll

Sets a group poll address for secondary stations on the link. The SDLC software supports the IBM 3174 group poll function. Use the add station or the set station group inclusion command to include a station in the group poll list.

Example:

set link group-poll

Enter group poll address (in hex) [00:]?f3

Group poll support enabled

link idle ¯ag

Con®gures the transmit idle state for SDLC framing. The default is the ¯ag option which provides continuous ¯ags (7E) between frames.

Example: set link idle flag

The link will receive a ¯ag idle transparently.

link idle mark

Con®gures the transmit idle state for SDLC framing. The mark option puts the line in a marking state (OFF, 1) between frames.

link inactivity #-of-seconds

For idle NRM/E secondary stations, sets the time after which the interface

changes the station to its recovery state. The range is 0 to 7200 seconds.

The default is 30. A 0 (zero) causes the station to remain idle inde®nitely.

Example:

set link inactivity

Enter secondary link station inactivity timeout :[30.0]?

link inter-frame delay seconds

Allows the insertion of a delay between transmitted packets. This command

ensures a minimum delay between frames for compatibility with older,

slower serial devices at the other end. This parameter is the amount of time

between frames in seconds.

Valid values: 0 to 120

Default value: 0

Example:

set link inter-frame delay

Transmit Delay Counter [0]?

link leading ¯ags

Sets the number of leading ¯ags. Use this command when the inter-frame

546MRS V3.2 Software User's Guide