Cabletron Systems SSR-ATM29-02, Руководство пользователя, Страница: 68 / 386

Chapter 6: Configuring SSR Bridging
68 CoreWatch User’s Guide
this method if you are configuring all the ports on a module to use address-
based bridging.
5. Click the Remove button.
Configuration Expert moves the selected port from the Flow Mode list to the
corresponding module in the Address Mode list box.
6. Click OK.
Configuration Expert adds the port to those found in the Address Mode Bridging
object, which is located in the Bridging Mode object.
Controlling the Aging State of SSR Bridging
The SSR ages learned MAC addresses in the Layer-2 lookup tables. Each port has its own
Layer-2 lookup table. When a learned MAC address entry ages out, the SSR removes that
entry from a port’s Layer-2 lookup tables unless you disable aging on that port.
You can control the aging of learned MAC address entries in the SSR’s Layer-2 lookup
tables. To do so, use Configuration Expert to perform the following tasks:
• Setting up an aging timeout that ports use by default. The SSR uses the aging timeout
to determine how long to keep learned MAC addresses. Aging is a regulation
mechanism the SSR uses to clean up MAC address entries that have not been used for
awhile.
• Overriding the default timeout interval. You do so by setting timeout intervals on any
ports that are to use an interval different from the default aging timeout.
• Disabling aging on a port if you do not want the SSR to remove MAC address entries
from that port’s Layer-2 lookup table.
Separate discussions on each task follow.
Setting Up a Default Aging Timeout
You can set an aging time for learned MAC address entries that all ports use by default.
When the aging time expires for a MAC address, the SSR removes the MAC address from
the port that uses the default timeout. To set up a default aging timeout for MAC address
entries:
1. Start Configuration Expert if you have not already done so.
2. Open the configuration file you want to modify and then double-click that file’s
Bridging Configuration object.
3. Double-click the Aging Configuration object.
4. In the list of aging objects that appears, select the Default Aging Timeout object.