Expand Configuration and Management Manual (H06.21+, J06.10+)

Expand Modifiers
Expand Configuration and Management Manual — 529522-013
16 - 16
L4TIMEOUT n
L4TIMEOUT n
Default: 2000 (20.00 seconds)
Units: 0.01 seconds
Range: 50 through 32767 (0.5 seconds through 5:27.67 minutes)
This path modifier is applicable to all Exp
and line types. This modifier specifies the
time interval, in one-hundredth of a second increments, that the Expand line-handler
process will wait for a response to an end-to-end (Layer 4) request before retrying. You
should read the description of the Layer 4 timeout in Section
17, Subsystem
Description, before using this modifier.
The Layer 4 timeout should not expire until all Layer 2 activity related to a specific
message transmission has ceased. Therefore, the L4TIMEOUT modifier value should
be large enough to span the worst case (the sum of the intermediate Layer 2 timers for
the longest end-to-end route).
This algorithm can be used to determine the L4TIMEOUT value:
L4TIMEOUT = (((l2retries * l2timeout * 3) + 10) * q)
l2retries is the number of times that the Expand line-handler process will try a
request at Layer 2 before reporting an error. (You can modify this value using the
L2RETRIES modifier as described in L2RETRIES n on page 16-11.)
l2timeout is the time interval, in one-hundredth of a second increments, that the
Expand line-handler process will wait for a response to a request at Layer 2 before
retrying. (You can modify this value using the L2TIMEOUT modifier as described
L2TIMEOUT n on page 16-12.)
q is the hop count (HC) of the longest end-to-end route in the network.
For Expand-over-X.25 connections, you should set the L4TIMEOUT modifier to a value
larger than the maximum anticipated response time on a loaded link.
LIFNAME n
Default: None
Units: Not applicable
Range: Not applicable
This modifier is applicable to Exp
and-over-ATM line-handler processes that use the
ATMSAP connection through the SLSA subsystem. This modifier identifies the name of
the logical interface by which LAN access is known to the system. Only the name
portion of the LIF name should be specified (for example, LIF01).
Note. The L4TIMEOUT modifier should be set to the same value for every Expand line-
handler process on every node in the network.