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Adding or Removing DLCI-Subnet Pairs in Frame Relay Configuration

Frame Relay transmission supports multiple virtual circuits, that is, you can have additional "virtual" lines going out on the Frame Relay to different places. By adding DLCI-subnet pairs, you define which IP packets you send over each virtual circuit.

To add a DLCI-Subnet pair, you specify a DLCI number and an associated IP address for the destination network or subnet. OnRamp then takes packets addressed to that subnet, encapsulates them in Frame Relay, and routes them to the private virtual circuit that corresponds to the specified DLCI number.

OnRamp provides menus to add or remove DLCI-subnet pairs from your Frame Relay configuration.

Adding DLCI-Subnet Pairs

To add DLCI-subnet pairs, follow these steps:

1 Use the up-arrow or down-arrow keys to scroll to the Add DLCI Menu:

another FR DLCI

? no yes

2. Use the right-arrow key to select yes, and press the OK key. OnRamp then displays a message like:

278

DLCI? chg go

3. If the DLCI number displayed is correct, use the right-arrow key to move the cursor to go, and press the OK key. If you want to change the DLCI number, press the OK key when the cursor is on chg.

4. If you selected chg, use the right-arrow and left-arrow keys and the numeric keypad to edit the DLCI number, then press the OK key.

5. OnRamp asks you to confirm the setting:

278

set? ok no

6. If the setting is satisfactory, press the OK key. If you select no, you can edit the setting again.

7. OnRamp briefly displays the DLCI you set, followed by the Q.922 address (computed from the DLCI), for example:

278 (Q922 X04C1)

8. OnRamp displays the Frame Relay IP Address Menu:

192.128.128.000/

fr278? chg go 24

The number before the / is the IP address of the destination network, called subnet. The number under the / is the number of network bits in the IP address.

9. Edit this menu to specify the desired subnet for the DLCI you set. Use the procedure described under Setting the IP Address in Chapter 3.

Removing DLCI-Subnet Pairs

OnRamp provides two ways to remove all existing DLCI-Subnet pairs:

1. Use the Line Type Menu to change the transmission protocol to PPP, then back again to Frame Relay, as described under Selecting the Transmission Protocol in Chapter 3.

2. Restore OnRamp's factory default settings, as described at the beginning of this chapter.

Either of these procedures will remove all of the existing
DLCI-Subnet pairs, after which you can enter your desired DLCI-Subnet pairs.

Adding a Virtual Ethernet Interface

OnRamp provides the option to enter a virtual second Ethernet address, so you can divide one physical network into two logical networks. Although OnRamp actually connects to only one Ethernet interface, Address Resolution Protocol (ARP) requests for the second IP address will receive replies from that address, and OnRamp will route packets to the second network or subnet.

To enter a second Ethernet address, follow these steps:

1. Use the up-arrow or down-arrow keys to scroll to the Interface Configuration Menu:

interface

config? no yes

2. Select yes, and press the OK key. OnRamp displays the current IP address of its Ethernet interface:

198.153.252.014

en0? chg no /24

If desired, you can change that address; use the procedure described under Setting the IP Address in Chapter 3. Otherwise, select no.

3. Use the up-arrow key to scroll to the Second Ethernet Interface Menu:

2nd EN interface

add? no yes

4. Select yes. OnRamp displays an Ethernet Address Menu for Ethernet en0a, as distinguished from en0 in Step 2:

198.153.252.014

en0a? chg no /24

5. Change the IP address and mask as desired, using the procedure described under Setting the IP Address in Chapter 3.

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