3Com 3500 - page 262

262 CHAPTER 9: BRIDGE-WIDE PARAMETERS
bridge spanningTree
✓ 3500
✓ 9000
✓ 9400
✓ 3900
✓ 9300
stpMaxAge
Determines when the stored CPDU configuration message is discarded
from the bridge’s memory if th e bridge is the root bri dge. The current
value is shown in the bridgeMaxAge field of the bridge display.
Valid Minimum Abbreviation
b sp stpm
Important Considerations
■If the value is too small, the STP may reconfigure the topology too
often, causing temporary loss of connectivity in the network.
■If the value is too large, the network may take longer than necessary
to adjust to a new STP configuration after a topology change such as
the restarting of a bridge.
■A conservative value assumes a delay variance of 2 seconds per hop.
The recommended and default value is 20 seconds.
■Although the possible range for stpMaxAge is 6 – 40 , the available
range is constrained by the following inequalities:
■2 x (stpForwardDelay - 1 second) >= stpMaxAge
■stpMaxAge >= 2 x (stpHelloTime + 1 seco nd)
Options
Prompt Description Possible Values [Default]
STP max age Value (in seconds) when the
stored configuration message
information is deemed too old
and is discarded
6 – 40 seconds 20 (factory
default), or
current value