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Configure the Virtual PPP Interface
The following steps show how to configure a PPP virtual interface (labeled 1) to the corporate
router. Skip to Create the Cross-Connect below if you are using Frame Relay.
1. At the (config)# prompt, enter interface ppp 1 to create a PPP virtual interface labeled 1.
2. Enter ip address 192.168.72.1 255.255.255.252 to assign an IP address to the PPP
endpoint using a 30-bit mask.
3. Enter no shutdown to activate the virtual interface to pass data.
4. Enter exit to return to the Global Configuration mode.
Create the Cross-Connect
1. For Frame Relay applications, at the (config)# prompt, enter cross-connect 1 e1 1/1 1
frame-relay 1 to connect the E1 network connection (e1 1/1) to the virtual Frame Relay
interface (fr 1.16).
or
2. For PPP applications, enter cross-connect 1 e1 1/1 1 ppp 1 to connect the E1 network
connection (e1 1/1) to the virtual PPP interface (ppp 1).
Configure Static Routes
Routes may be assigned either statically or dynamically. Continue with this section to create a
static route. Refer to the next section for information on configuring RIP and OSPF dynamic route
assignments.
These examples are based on the network diagrams on page 1.
Depending on your network setup, configure static routing on your unit in one of the following
ways.
Scenario 1: Configuration for Corporate HQ router in the diagram on page 1 (Static Route
to the Far Side/Internet Access at Local Site)
1. At the (config)# prompt, enter ip route 10.10.20.0 255.255.255.0 ppp 1 (or frame-relay
1.16) to set up the static route.
2. Enter ip route 0.0.0.0 0.0.0.0 10.10.10.x (i.e., address of internet router) to set up the default
route.
Scenario 2: Configuration for Branch Office router in the diagram on page 1 (No Internet
Access at Local Site)
1. At the (config)# prompt, enter ip route 0.0.0.0 0.0.0.0 ppp 1 (or frame-relay 1.16) to set up
the default route.
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