Cabletron Systems 2.2 manual IP Address, Subnet Mask

Bridging

NOTE

It is recommended that the device be restarted when changes are made that affect source route bridging in order to clear the buffers, but you do not need to restart for the changes to take effect.

The following Þelds are available in the Source Route ConÞguration Window:

IP Address

This Þeld displays the Internet Protocol (IP) address, which acts as a logical identiÞer on the network, currently assigned to each port on the device. This is needed for SNMP network management capability. The IP address is expressed in dotted decimal notation (four decimal values between 0 and 255, separated by a period, e.g., 255.255.255.255).

This Þeld can only be edited (with the correct security access) via Local Management for the device. Refer to the appropriate device-speciÞc UserÕs Guide for more information.

Subnet Mask

A subnet mask is used by a device to determine whether a destination address exists within its own subnetwork (logical division of the network by router or gateway) and can be reached directly, or whether it is unknown and therefore must be delivered to a router (as speciÞed by the deviceÕs IP routing table or default gateway address).

A subnet mask should be set at the device if it will issue SNMP traps in a routed environment, so that the trap messages it generates will be routed correctly.

A subnet mask acts as a Þlter for destination IP addresses. It is a 32-bit quantity in which all bits that correspond to the network portion (both site and subnet identifying bits) of the deviceÕs IP address are set to 1, and all bits that correspond to the host portion are set to 0.

The device will logically AND a destination trap IP address with the subnet mask to determine which portion of the address identiÞes the network/ subnetwork. The device then compares the result on a bit-to-bit basis with the network-identifying bits in its own IP address. If the network portions match, the bridging device transmits the trap onto its subnetwork. If they do not match, the device transmits the trap through a router or gateway.

This Þeld can only be edited (with the correct security access) via Local Management for the device (or the MIBTree utility). Refer to the appropriate device-speciÞc UserÕs Guide for more information.

MAC Address

This Þeld displays the Media Access Control (MAC) layer address which identiÞes the ports/interfaces of the bridging device on a network. This six-byte address is set at the factory and is unique to each interface. Each byte is identiÞed in bit order starting with the most signiÞcant bit. You cannot conÞgure this Þeld.

Source Route Configuration 2-59