B-1

9161-A2-GH30-30 April 1998
IP Addressing B

Selecting an IP Addressing Scheme

You can select from many IP addressing schemes to provide SNMP NMS, Telnet,
or FTP connectivity. When selecting a scheme, keep the following in mind:
Because connection to remote devices is through different interfaces (for
EDL), it may be necessary to assign IP addresses and subnet masks to each
EDL individually.
Avoid multiple EDL connections between the same two devices to prevent
routing loops.
Assign IP addresses on a per-interface or T1 access unit basis.
Although routing information is automatically passed between interconnected
T1 access units from the network side, make sure to set a route to the
subnet(s) in the NMS’s or local router’s routing table.
The gateway to subnet(s) is through the T1 access unit connected to:
— The LAN (using a LAN adapter), or
— To a router’s, terminal server’s, or NMS’s direct PPP (point-to-point
protocol) or SLIP (link-layer protocol for IP traffic) serial connection.
Each T1 unit’s routing table supports a maximum of 300 routes, even though
a single route is all that is needed to reach every device on a subnet.
Have a default route set only for devices directly connected to the NMS’s
COM port.
Allow any legal host address for a given subnet; the address choice within
the subnet is not important to the unit, but should be selected in conjunction
with all IP addressing for the subnet.
For a point-to-point ESF T1 link, use the FDL to connect to the remote site.
For a fractional T1 network, use EDL(s) to connect to each remote site (when
at least one data port is configured at that site).