Cabletron Systems STHI manual The System Level Screen, Subnet Mask, Enable IP Address Discovery

Models: STHI

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5.3.3Subnet Mask

The System Level Screen

5.3.3Subnet Mask

The Subnet Mask determines how the STHI directs SNMP Trap messages (discussed in Section 5.5). The mask defines the portion of the trap destination’s IP address to be compared to the IP address of the STHI. If the designated address portions match, the destination station is determined to exist on the same subnet as the STHI; Network Management Stations (NMS) within the STHI hub’s own subnet are addressed directly. Traps destined for stations on other subnets are sent through a router.

Set a new value for the Subnet Mask when workstations designated to receive traps reside on a different subnet. In most cases, 255.255.0.0 (the 8-bit subnet mask) is the appropriate mask.

Use the Subnet Mask setting of 0.0.0.0 when all workstations designated to receive trap messages exist within the same subnet as the STHI.

If the Subnet Mask is changed, the STHI will execute a soft-reset after SAVE is invoked to re-initialize all affected parameters.

5.3.4Enable IP Address Discovery

This Yes/No toggle field is used to enable/disable IP Address Discovery. (Refer to Section 1.2.8, IP Address Discovery.) Use the Return key to toggle the field. When the toggle field set to YES and SAVE is invoked, the accompanying State field indicates that the device is SEEKING an IP Address. If it finds one, the State field indicates ACQUIRED. If it fails 500 times, it displays FAILED.

Retry Interval

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The Retry Interval field determines the duration between automatic attempts at IP Address Discovery. Each attempt takes about one half-minute. The STHI then waits for as many minutes as specified in the Retry Interval field before trying again. This cycle continues until the address is acquired, the IP Address Discover feature is disabled, or the process is attempted 500 times.

To force an immediate check, rather than waiting for the

TIP next cycle, toggle Enable IP Address Discovery to NO and then to YES again, and then invoke SAVE.

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Cabletron Systems STHI manual The System Level Screen, Subnet Mask, Enable IP Address Discovery, Retry Interval