Cabletron Systems STHI User Manual

Page 5-9

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 

 is invoked to re-initialize all affected parameters.

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 

 and 

 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

.

1

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.

Enable IP Address Discovery