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Configuring X.25 235
includes multiple protocols crossing a single circuit, you can make use of the following
command structure:
Router(config-if)#x25 map protocol address
[
protocol2 address2] [protocol3 address3] x.121 address [options]
In the previous command, up to nine protocol and address specifications can be made in a single
command. This utilizes the multiprotocol encapsulation specified in RFC 1356. All the logical
next hop protocol addresses are mapped to a single x.121 address.
X.25 Configuration Examples
Once the encapsulation is specified (and the X.121 address is entered and the X.25 maps are
completed), the basic configuration for X.25 SVC connectivity is complete. Figure 8-6 depicts
the network example that is utilized in the rest of this discussion.
Figure 8-6
X.25 Network Example
The SVC configuration for this example is a fully meshed network. You need to create separate
x25 map statements on each router to each destination. IP is currently the only protocol
transported across the X.25 network. Example 8-1 shows the RouterA configuration followed
by Example 8-2 and 8-3, which show the RouterB and RouterC configurations, respectively.
Example 8-1
RouterA X.25 Configuration
RouterA(config)#interface ethernet 0
RouterA(config-if)#ip address 10.1.10.1 255.255.255.0
RouterA(config-if)#interface serial 0
RouterA(config-if)#encapuslation x25
RouterA(config-if)#ip address 10.1.11.1 255.255.255.0
RouterA(config-if)#x25 address 42495092091
RouterA(config-if)#x25 map ip 10.1.11.2 51472092091 broadcast
RouterA(config-if)#x25 map ip 10.1.11.3 51171092091 broadcast
S0
E0
S0
E0
X.25 network
Router B
Router C
E0
S0
Router A
E0 IP=10.1.10.1/24
S0 IP=10.1.11.1/24
X.121=42495092091
E0 IP=10.1.12.1/24
S0 IP=10.1.11.2/24
X.121=51472092091
E0 IP=10.1.13.1/24
S0 IP=10.1.11.3/24
X.121=51171092091