Allied Telesis AT-S63 - Manual (Page 295)

AT-S63 Management Software Menus Interface User’s Guide
Section II: Advanced Features 295
2 - Hello Time
The time interval between generating and sending configuration
messages by the bridge. The range of this parameter is 1 to 10
seconds. The default is 2 seconds. This value is active only if the
bridge is selected as the root bridge of the network.
3 - Forwarding Delay
The waiting period before a bridge changes to a new state, for
example, becomes the new root bridge after the topology
changes. If the bridge transitions too soon, not all links may have
yet adapted to the change, possibly resulting in a network loop.
The range is 4 to 30 seconds. The default is 15 seconds. This
setting applies only to ports running in the STP-compatible mode.
4 - Max Age
The length of time after which stored bridge protocol data units
(BPDUs) are deleted by the bridge. This parameter applies only if
the bridged network contains an STP or RSTP single-instance
spanning tree. Otherwise, the bridges use the Max Hop counter to
delete BPDUs.
All bridges in a single-instance bridged LAN use this aging time to
test the age of stored configuration messages called bridge
protocol data units (BPDUs). For example, if you use the default of
20, all bridges delete current configuration messages after 20
seconds. The range of this parameter is 6 to 40 seconds. The
default is 20 seconds.
When you select a value for maximum age, observer the following
rules:
MaxAge must be greater than (2 x (HelloTime + 1)).
MaxAge must be less than (2 x (ForwardingDelay - 1))
5 - Max Hops
MSTP regions use this parameter to discard BPDUs. The Max Hop
counter in a BPDU is decremented every time the BPDU crosses an
MSTP region boundary. After the counter reaches zero, the BPDU
is deleted.
6 - Configuration Name
The name of the MSTP region. The range is 0 (zero) to 32
alphanumeric characters in length. The name, which is case
sensitive, must be the same on all bridges in a region. Examples
include Sales Region and Production Region.
7 - Revision Level
The revision level of an MSTP region. The range is 0 (zero) to 255.
This is an arbitrary number that you assign to a region. The