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.
Gateways that are on the same network are called neighbor gateways. A
non-gateway node on a LAN, Token Ring, or FDDI 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 LAN, Token Ring, FDDI, 100VG-AnyLAN or 100Base-T
nodes that are on the same network as a neighbor gateway need to know the
identity of any neighbor gateways. When you configure a LAN, Token Ring, FDDI,
100VG-AnyLAN, or 100Base-T 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.
You may designate gateways as default gateways. Messages for a network
will be routed to a default gateway if there is no gateway configured for the
destination network. The default gateway will then attempt to locate the
destination of the message.
Identify Neighbor Gateways (If Any Are Present)
The Neighbor Gateways screen (#152) in Figure
6-5 "Neighbor Gateways Screen" is displayed when you press the
[Neighbor Gateways] key at the selected Guided configuration screen for
the LAN, Token Ring and FDDI networks.
Figure 6-5 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. (Nodes are on the same network if the network portions
of their IP addresses are the same.).
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 selected configuration
screen (LAN, Token Ring, or FDDI) and proceed to
Chapter 10 "Validating and Cross-Validating with
SYSGEN"
Fields
Gateway name
Each gateway name can be as long as eight alphanumeric characters. The
first character must be alphabetic.
In the Neighbor Gateway IP Internet Address field, enter
the IP address of the gateway specified on the Neighbor Gateways
screen. C 192.191.191 009 is a typical address.
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. If you want to
designate this gateway as a default gateway, enter an at sign
(@) in one of the fields as well.
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.
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. The
information configured in this screen can extend to more than one
page, if necessary, to allow configuration of up to 2550 reachable
networks per link (255 pages and 10 reachable nets per page). 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
[Prior 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
[Prior Screen] key to return to the selected configuration
screen (LAN, Token Ring, or FDDI). Proceed to
Chapter 10 "Validating and Cross-Validating with
SYSGEN"
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.
Neighbor Gateway IP Internet Address
The IP address of the gateway whose name you have specified on the
Neighbor Gateways Screen. The IP address is in the same format as the
selected configuration screen (LAN, Token Ring, or FDDI).
IP Network Address
In the fields under this heading, you list the IP addresses of all of
the networks that you will be able to reach through the gateway you are
configuring. You also use this field to indicate whether or not the
gateway is to serve as a default gateway by entering an at sign
(@) to specify that it is a default gateway. Only one
gateway can be designated as a default gateway for each HP e3000
system.
IP Mask (Optional)
The fields under this heading allow you to specify a subnet mask for
each reachable network. This mask is optional.
Hops
In the fields under this heading, enter the number of hops
corresponding to the number of gateways that a packet travels to reach a
remote network from a local network.