Foundry Configuration Guide for the FESX, FSX, and FWSX
7 - 48 © Foundry Networks, Inc. December 2005
Bridge IEEE 802.1W Parameters
Bridge Identifier The ID of the bridge.
Bridge Max Age The configured max age for this bridge. The default is 20.
Bridge Hello The configured hello time for this bridge.The default is 2.
Bridge FwdDly The configured forward delay time for this bridge. The default is 15.
Force-Version The configured force version value. One of the following value is
displayed:
• 0 – The bridge has been forced to operate in an STP compatibility
mode.
• 2 – The bridge has been forced to operate in an 802.1W mode.
(This is the default.)
txHoldCnt The number of BPDUs that can be transmitted per Hello Interval. The
default is 3.
Root Bridge Identifier ID of the Root bridge that is associated with this bridge
Root Path Cost The cost to reach the root bridge from this bridge. If the bridge is the
root bridge, then this parameter shows a value of zero.
Designated Bridge Identifier The bridge from where the root information was received.It can be
from the root bridge itself, but it could also be from another bridge.
Root Port The port on which the root information was received. This is the port
that is connected to the Designated Bridge.
Max Age The max age is derived from the Root port. An 802.1W-enabled
bridge uses this value, along with the hello and message age
parameters to compute the effective age of an RST BPDU.
The message age parameter is generated by the Designated port
and transmitted in the RST BPDU. RST BPDUs transmitted by a
Designated port of the root bridge contains a message value of zero.
Effective age is the amount of time the Root port, Alternate port, or
Backup port retains the information it received from its peer
Designated port. Effective age is reset every time a port receives an
RST BPDU from its Designated port. If a Root port does not receive
an RST BPDU from its peer Designated port for a duration more than
the effective age, the Root port ages out the existing information and
recomputes the topology.
If the port is operating in 802.1D compatible mode, then max age
functionality is the same as in 802.1D (STP).
Table 7.8: CLI Display of 802.1W Summary (Continued)
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