From: Azhar Mehmood (azhar.mehmood@web.de)
Date: Sat Oct 19 2002 - 23:28:25 GMT-3
Hi,
some one yesterday was acquiring about this topic, but I don't know how. Anyway I found infos bellow in "Catalyst 3550 Multilayer Switch Software Configuration Guide".
regards
Azhar M.
Germany
- Accelerated Aging to Retain Connectivity
The default for aging dynamic addresses is 5 minutes, the default setting of the "mac-address-table aging-time" global configuration command. However, a spanning-tree reconfiguration can cause many station locations to change. Because these stations could be unreachable for 5 minutes or more during a reconfiguration, the address-aging time is accelerated so that station addresses can be dropped from the address table and then relearned. The accelerated aging is the same as the forward-delay parameter value ("spanning-tree vlan [vlan-id] forward-time [seconds]" global configuration command) when the spanning tree reconfigures. Because each VLAN is a separate spanning-tree instance, the switch accelerates aging on a per-VLAN basis. A spanning-tree reconfiguration on one VLAN can cause the dynamic addresses learned on that VLAN to be subject to accelerated aging. Dynamic addresses on other VLANs can be unaffected and remain subject to the aging interval entered for the switch.
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