| 7.2 | Configuring X.25 | ||
| 7.2.3 | Configuring X.25 SVCs |
| To activate X.25 on an
interface, you must enter the
encapsulation x25
command to
specify the encapsulation style to be used on the serial interface:
Router(config-if)#encapsulation x25 [dte | dce] The router can be an X.25 DTE device, which is typically used when the X.25 PDN is used to transport various protocols. The router can also be configured as an X.25 DCE device, which is typically used when the router acts as an X.25 switch. Configuring X.25 SVC Examples Figure Example Example Table If you change the interface configuration from an X.25 DCE to X.25 DTE or vice versa, the interface configuration will change to the default interface settings. IP routing on CENTRAL SITE forwards datagrams destined for subnet 10.60.8.0 to interface serial 1. The interface map identifies the destination to the X.25 cloud. In this typical configuration, CENTRAL SIGHT tries to establish an SVC to BRANCH OFFICE using its X.121 source address and a destination X.121 address of 311082191234 when it sends packets to 10.60.8.2. Upon receipt of the setup request, Cisco B identifies the remote IP address from the source X.121 address and accepts the connection. After the SVC is connected, each router uses it as a point-to-point data link for the identified destination. The two X.25 attachments need complementary map configurations to establish the VC that will encapsulate IP datagrams. Example The sample network in Figure
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