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Configuring the Ethernet Interface 4-7

Configuring Ethernet Subinterfaces

With the subinterface feature of the ComOS, you can create up to 512 subinterfaces (the

total number of interfaces available on a PortMaster) on a single primary Ethernet

interface. Because you have the bandwidth of only a single Ethernet interface, however,

efficiency begins to degrade significantly when you add more than 8 subinterfaces.

Subinterfacing is essentially the segmenting of a single wire, or port, into multiple IP

networks. Instead of subnetting and routing, you can create a subinterface and then set

it up as you would a standard Ethernet interface. To avoid routing loops, however, you

must be sure not to create two subinterfaces in the same TCP/IP network on the same

port. Each Ethernet subinterface must have a unique network.

A drawback to subinterfacing is that it supports static routing only; IPX, RIP, OSPF,

packet filtering, and route propagation are not supported on subinterfaces.

You must configure the primary Ethernet interface before adding subinterfaces (see

“Setting General Ethernet Parameters” on page 4-1 for details). After you configure the

primary Ethernet interface, follow this procedure to add a subinterface.

1. Create a subinterface.

Command> add subinterface name

This command adds an entry to the subinterface table, which you can then view

with the show subi command. Remove a subinterface from the subinterface table

with the del subi command.

2. Associate the subinterface with a physical port.

Command> set subinterface name port-name portlabel

3. Assign an IP address or and IP address and net mask to the subinterface.

Command> set subinterface name Ipaddress [/NM]|[Ipaddress/NM]

You can specify the netmask in the

/NM

or dotted decimal format. You can also

configure the IP address and netmask separately (see the

PortMaster Command Line

Reference

for details

4. Set the broadcast for the interface.

Command> set subinterface name broadcast high|low

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Lucent-technologies PortMaster Manual de usuario Pagina 75