Cabletron Systems EMM-E6 - Manual (Page 78)

Source Addressing
6-4 Setting the Hash Type
Setting the Aging Time
The source address list Aging Time determines the minimum amount of time an
inactive source address will remain in the Source Address Table before it is
purged. The source address timer runs continuously beginning at the time the
device is turned on; source addresses that are added to the SAT during one timer
cycle will remain in the table for the rest of the current cycle and at least through
the next complete cycle. If no packets have been received from that address
during one complete cycle, the address will be purged.
The Aging Time is user-configurable, and can be set using the Aging Time text
box in the Source Address list window.
To change the Aging Time:
1. In the Source Address List window ( Figure 6-2 , page 6-3 ), highlight the
displayed aging time.
2. Enter your desired aging time in minutes; allowable range is 0 to 4320 (three
days).
3. Click mouse button 1 on to save your change.
The new Aging Time takes effect immediately.
Setting the Hash Type
You can increase the efficiency with which your EMM-E6 handles the Source
Address Table by selecting the appropriate hashing algorithm. If you are
operating in a DECnet environment, or one which incorporates some DECnet
elements, select the DEC hashing algorithm; if your network contains no DECnet
elements (or at least none operating on the same network segment as your
EMM-E6), select the non-DEC hashing algorithm. Making the wrong selection
won’t do any damage, but making the correct selection will optimize
performance.
To set the Hash Type for a repeater interface, or channel:
1. In the Repeater Source Address window, click mouse button 1 on the repeater
interface for which you would like to set the hash type.
NOTE
The snapshots of the Source Address List that you can obtain via this feature do not reflect
the current port security status of the SAT — that is, when Source Address Locking is
enabled, you can still observe addresses being aged out of the table and new addresses
being added as you refresh the Source Address List displayed in this window. However,
the EMM-E6 remembers the addresses that were in the table when locking was enabled,
and will continue to protect locked ports from access by unauthorized sources. For more
information, see
Locking Source Addresses , page 6-5 .