AIS AI2524 Manuel D’Utilisation
AI2524 Router Card User’s Manual
Page 12-12
August 1997
2524UM
Suppress or Replace the Calling Address
Some attachments require that no calling (source) address be presented
in outgoing calls. The requirement is called suppressing the calling ad-
dress.
in outgoing calls. The requirement is called suppressing the calling ad-
dress.
When attached to a PDN, X.25 may need to ensure that outgoing calls
only use the assigned X.121 address for the calling (source) address.
Routed X.25 normally uses the original source address. Although in-
dividual X.25 route configurations can modify the source address,
Cisco provides a simple command to force the use of the interface ad-
dress in all calls sent; this requirement is called replacing the calling
address.
only use the assigned X.121 address for the calling (source) address.
Routed X.25 normally uses the original source address. Although in-
dividual X.25 route configurations can modify the source address,
Cisco provides a simple command to force the use of the interface ad-
dress in all calls sent; this requirement is called replacing the calling
address.
To suppress or replace the calling address, perform the appropriat
task in interface configuration mode:
task in interface configuration mode:
z
Suppress the calling (source) X.121 address in outgoing calls.
x25 suppress-calling-address
z
Replace the calling (source) X.121 address in switched calls.
x25 use-source-address
Suppress the Called Address
Some attachments require that no called (destination) address be pre-
sented in outgoing calls; this requirement is called suppressing the
called address.
sented in outgoing calls; this requirement is called suppressing the
called address.
In interface configuration mode, suppress the called address:
x25 suppress-called-address
Establish a Default Virtual Circuit Protocol
The Call Request packet that sets up a virtual circuit can encode a field
called the Call User Data (CUD) field. Typically, the first few bytes of
the CUD field identify which high-level protocol is carried by the vir-
tual circuit. The router, when acting as a destination host, normally re-
fuses a call if the CUD is absent or if the protocol identification isn't
recognized. The PAD protocol, however, specifies that unidentified
calls be treated as PAD connection requests. Other applications re-
quire that they be treated as IP encapsulation connection requests, per
RFC 877.
called the Call User Data (CUD) field. Typically, the first few bytes of
the CUD field identify which high-level protocol is carried by the vir-
tual circuit. The router, when acting as a destination host, normally re-
fuses a call if the CUD is absent or if the protocol identification isn't
recognized. The PAD protocol, however, specifies that unidentified
calls be treated as PAD connection requests. Other applications re-
quire that they be treated as IP encapsulation connection requests, per
RFC 877.
In interface configuration mode, configure either PAD or IP encapsu
lation treatment of unidentified calls:
lation treatment of unidentified calls:
x25 default {ip | pad}