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Call Retry Timer (secs) is activated in the event of an failed call attempt and prevents
a potential “thrashing” situation that may occur when the IP router directs a stream of
datagrams to a busy or unreachable destination. With the timer enabled (set at a non-
zero value), the X.25 PDN service drops received datagrams and transmits another
call request at the expiration of the timer. With the timer disabled (set to 0), the X.25
PDN service sends call request packets for every datagram received from the IP
router until the call is accepted.
Default: 60
Range: 0 to 9999
Circuit Name
Accepts an ASCII character string identifying the LAPB circuit name.
Circuit Type
Determines the circuit type.
LAPB
Always set to LAPB—ignore all other protocol options when configuring LAPB
circuits.
Closed User Group
Determines whether the lower circuit is connected to a port subscribing to CUG
(Closed User Group). For additional information, refer to Table 13-2.
Default: No
No
Disables CUG security, and access into or out of the router is controlled only by the
X.25 features supported by the PDN subscription service.
Yes
Enables CUG security. CUG provides various classes of security, depending on the
particular X.25 features purchased from the PDN subscription service. When Closed
User Group is set to Yes, the Outgoing Access and Group Number parameters appear
on the configuration screen.
Connection ID
Enables the establishment of multiple, parallel dedicated virtual circuits between two
routers. Such parallel circuits may result in higher throughput, because of the
increased window size afforded by multiple virtual circuits.
Default: None
Range: 1 to 99
Options
If you are establishing only one dedicated virtual circuit between the local router
and the remote peer designated by Remote DTE Address, enter 1. When
configuring the remote peer, you must ensure that you also assign a Connection
ID of 1.
If you are establishing multiple dedicated virtual circuits between the local and
remote peers, you must assign a unique Connection ID to each virtual circuit. When
configuring the remote peer, you must ensure that you assign identical Connection
ID values.
X.25 Service
Parameters
13
X.25 Service Parameters
Parameters and Options
13-5