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You need to visit the next two screens only if you are configuring a
non-gateway node that is on the same network as a gateway. In this case, the
non-gateway node needs to know the identity of any neighbor gateway.
Neighbor gateways can be either full or half gateways. (Go back one level by
pressing the [Prior Screen] key, then select [Neighbor Gateways]
key).
Gateways that are on the same network are called neighbor gateways. A
non-gateway node on an X.25 network may need to go through a neighbor gateway
in order to send messages to an entirely different network. (Two nodes are on
the same network if the network portion of their IP addresses are the
same.) All X.25 nodes that are on the same network as a neighbor gateway need
to know the identity of any neighbor gateways. When you configure an X.25 node,
you enter into its configuration the identity of any accessible neighbor
gateways that share the same network. The identified gateways may be either
full or half gateways.
Identify Neighbor Gateways (If Any Are Present)
NMMGR displays the Neighbor Gateways screen
(Figure 6-7 "Neighbor Gateways Screen")
when you press the [Neighbor Gateways] key at the X.25 Configuration
screen.
Figure 6-7 Neighbor Gateways Screen
- In the Gateway name field, enter the name of a gateway that is
on the same network as the node that you are configuring.
- If you are adding the identified gateway for the first time, press the
[Add] key. If you are modifying the configuration of this node,
press the [Modify] key. The Neighbor Gateway Reachable Networks
screen will be displayed. Proceed to "Identify Neighbor Gateway
Reachable Networks."
- Repeat steps 1 and 2 for each gateway that is on the same network as the
node that you are configuring. When you have finished, press the
[Next Screen] key to return to the X.25 Configuration screen.
Fields
- Gateway name
- Each gateway name can be as long as eight alphanumeric characters. The
first character must be alphabetic.
Identify Neighbor Gateway Reachable Networks
NMMGR displays the Neighbor Gateway Reachable Networks screen
(Figure 6-8 "Neighbor Gateways Screen")
when you press the [Add] key or the [Modify] key for a valid
gateway name from the Neighbor Gateways screen.
Figure 6-8 Neighbor Gateways Screen
![[Neighbor Gateways Screen]](img/gfx33.gif)
- In the Neighbor Gateway IP Internetwork Address field, enter
the IP address of the gateway specified on the Neighbor Gateways screen.
An example is:
C 192.007.007 001
- In the IP Network Address fields under the title Configured
Reachable Networks, enter the IP addresses of all the remote
networks that can be reached through the gateway whose IP address is
configured in the previous field.
- The IP subnet mask is optional. If entering one, tab to the next field.
In the IP subnet mask field, enter the number in the same format as an
IP address. For details on deriving an IP subnet mask, refer to the
HP 3000/iX Network
Planning and Configuration Guide.
- In the field labeled Hops, enter the number of hops (full
gateways) needed to get to the target network. Two partner gateway
halves count as one hop.
- Repeat steps 2, 3, and 4 for each remote reachable network. If you need
to configure more than 10 networks, press the [Save Data] key
then press the [Next Page] key to enter more networks.
- After you have finished entering the IP addresses of all the reachable
networks, press the [Save Data] key. Press the [Next
Screen] key to return to the Neighbor Gateways screen.
- Back at the Neighbor Gateways screen, after you have finished adding all
of the neighboring gateways, press the [Next Screen] key to
return to the X.25 Configuration screen. Follow instruction 7 in the
section in this chapter called "Step 6: Configure X.25 Network."
Fields
If you have identified any neighbor gateways, then you will also be
identifying: 1) the IP Network Addresses of all of the networks that
you can reach through that gateway, and 2) the number of hops
(corresponding to the number of gateways) that a packet passes through to
reach a remote network from the local network. Two gateway halves count as one
hop.
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![[Neighbor Gateways Screen]](img/gfx32.gif)
