3Com 4007, Руководство по внедрению, Страница: 191 / 684

Address Aging 191
The module reverts to using the
bridge agingTime
value as the aging
interval after it receives a CBPDU from the root bridge that does not have
the topology change flag set.
Port Down Events
When a Multilayer Switching Module detects a port down event, it
immediately flushes all addresses for that specific port. This process
occurs no matter what setting exists for the bridge or port STP states.
When a Layer 2 Switching Module that has STP enabled detects a port
down event, if that port is not an active STP port (in the forwarding state),
there is no change to aging behavior. Otherwise, the normal STP process
of temporarily using the forward delay value applies.
If the STP State
is Disabled
In this state, the module does not participate in STP operations. The aging
process works as follows:
■
Multilayer Switching Modules — These modules age dynamic
addresses as described in “Normal Aging Process” earlier in this
section, except for when link down events are detected. When a port
goes down or is disabled, the module immediately flushes all
addresses for that specific port. (This process occurs no matter what
setting exists for the bridge or port STP states.)
■
Layer 2 Switching Modules — At all times, including when ports go
down or are disabled, it ages dynamic addresses as described in
“Normal Aging Process” earlier in this section.
If you do not want to enable STP, but you want addresses to age faster
when ports go down, use the
bridge spanningTree stpState
agingOnly
option (described next).