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C H A P T E R
4
F E A T U R E S
configured in the general menu. This periodic sending of spanning tree protocol packets makes the use of
STP undesirable is dial-up networks.
4.13 The Integrated IP Router
4.13.1 Overview
This section describes the basic concepts behind the integrated IPV4 router available on Revision D and
later V100 platforms. It is assumed that the reader has a basic understanding on the operation of an IP
router and the operation of other services in the V100. The section includes configuration examples for
typical installations and troubleshooting tips – however, it is not intended to fully describe the user
interface – please refer to the MENUs section for these details.
4.13.2 Basic IPV4 Routing
The V100 integrated IP router forwards data from one LAN to another across a V100 WAN link. This is
achieved by establishing a connection from one node to another and assigning it a maximum bandwidth
over the aggregate in a similar way to a DBA data channel. Once this is established, the IP router at each
end performs the filtering or forwarding of all traffic relevant to the remote network according to a
manually entered static route table. The router may act as a local DHCP server and supports UDP
TM
broadcasts to support Windows
applications.
4.13.3 Network Configuration
The V100 includes routing software for forwarding IP data between the 10/100base-T Ethernet port and
aggregate ports. To utilize this facility, the V100 must be configured with information about the IP sub-
networks that the V100 network is interconnecting. All configurations must include at least:
IP address and subnet mask for the Ethernet port
Configuration of how the IP router connects to the V100 network
Configuration of static IP routes
Configuration of the first two components is done through the NETWORKS screen of the IP sub-menu. The
NETWORKS screen describes how the IP router connects to both the local LAN and the V100 WAN
network.
The Ethernet is represented in the user interface with the port name "ENET". The Ethernet must be
configured with the IP address of the Ethernet port on the local network, and the mask of the local subnet.
Any host stations (PCs), or routers on this local network, must be configured to use the IP address of the
V100 Ethernet as the next-hop gateway for all IP networks that the V100 is providing interconnect
services for. In the example below, the Ethernet port has been configured with the address 192.168.1.1,
and the mask 255.255.255.0 – this mask will allow the configuration of 253 other IP stations on the local
network (two addresses are also reserved for broadcast use). The Maximum Transmission Unit (MTU) in
bytes is typically left at the default value of 1514 for the Ethernet port. The UDP Gateway (UDPGw) option
V100 Versatile Multiplexer Technical Manual Version 2.2
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