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CLI display of 802.1W summary (Continued)TABLE 49

Field Description

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).

Fwd Dly 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).

Hello The hello value derived from the Root port. It is the number of seconds between two Hello

packets.

Port IEEE 802.1W parameters

Port Num The port number shown in a slot#/port# format.

Spanning Tree Protocol

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