HP ProCurve 9304M Installation And Configuration Manual page 260

Installation and Basic Configuration Guide
This Field...
Force-Version
txHoldCnt
Root Bridge Identifier
Root Path Cost
Designated Bridge Identifier
Root Port
Max Age
Fwd Dly
8 - 54
Table 2: CLI Display of 802.1W Summary (Continued)
Displays...
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.)
The number of BPDUs that can be transmitted per Hello Interval. The
default is 3.
ID of the Root bridge that is associated with this bridge
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.
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.
The port on which the root information was received. This is the port
that is connected to the Designated Bridge.
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).
The number of seconds a non-edge Designated port waits until it can
apply any of the following transitions, if the RST BPDU it receives
does not have an agreed flag:
• Discarding state to learning state
• Learning state to forwarding state
When a non-edge port receives the RST BPDU it goes into forwarding
state within 4 seconds or after two hello timers expire on the port.
Fwd Dly is also the number of seconds that a Root port waits for an
RST BPDU with a proposal flag before it applies the state transitions
listed above.
If the port is operating in 802.1D compatible mode, then forward delay
functionality is the same as in 802.1D (STP).