Dell PowerConnect B-FCXs Configuration Manual page 303

TABLE 53
This field...
Bridge IEEE 802.1W parameters
Bridge Identifier
Bridge Max Age
Bridge Hello
Bridge FwdDly
Force-Version
txHoldCnt
Root Bridge Identifier
Root Path Cost
Designated Bridge Identifier
Root Port
Max Age
Fwd Dly
PowerConnect B-Series FCX Configuration Guide
53-1002266-01
CLI display of 802.1W summary (Continued)
Displays...
The ID of the bridge.
The configured max age for this bridge. The default is 20.
The configured hello time for this bridge.The default is 2.
The configured forward delay time for this bridge. The default is 15.
The configured force version value. One of the following value is
displayed:
•
•
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:
•
•
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).
Configuring STP related features
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.)
Discarding state to learning state
Learning state to forwarding state
8
261