HP 3000 Manuals

HP3000/iX Network Planning and Configuration Guide

To Configure Neighbor Gateways 

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, or
FDDI 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, or FDDI 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 one gateway as a default gateway.  Messages for a
network will be routed to the 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.


NOTE  You may only have one active default gateway per node.

      If you configure a default gateway on more than one NI on a single
      node, the active default gateway will be the gateway on the NI that
      you start last when you start your network interfaces.


To Identify Neighbor Gateways (If Any Are Present) 

The Neighbor Gateways screen(#152) in figure 6-5 is displayed when you
press the [Neighbor Gateways] key at the selected configuration screen
for the LAN, token ring, and FDDI via screen numbers 41, 49, and 201
respectively.


          Figure 6-5.  Neighbor Gateways Screens 

Steps.   

   1.  In the Gateway namefield, 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.)  You may configure up to 14 gateways under an NI.

   2.  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."

   3.  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 titled "Validating the Network Transport 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.

To Identify Neighbor Gateway Reachable Networks 

The Neighbor Gateway Reachable Networks screen(#158) in figure 6-6 is
displayed when you press the [Add] or [Modify] key for a valid gateway
name from the Neighbor Gateways screen (#152) in figure 6-5.


          Figure 6-6.  Neighbor Gateway Reachable Networks Screen 

Steps.   

   1.  In the Neighbor Gateway IP Internet Addressfield, enter the IP
       address of the gateway specified on the Neighbor Gateways screen.
       C 192.191.191 009 is a typical address.

   2.  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.

   3.  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.

   4.  In the field labelled Hops, enter the number of hops (full
       gateways) needed to get to the target network.  Two partner
       gateway halves count as one hop.

   5.  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.

   6.  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.

   7.  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 titled "Validating the
       Network Transport 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       The IP address of the gateway whose name you
Internet Address          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 900 Series HP 3000 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.

MPE/iX 5.0 Documentation