Rstp 802.1w Description Port Role | Dell 6.2 instruction

STP (802.1d) Port State

Listening

RSTP (802.1w) Port State

Discarding

Learning

Forwarding

In addition to port state changes, RSTP introduces port roles for all the interfaces (see Table 146).

Table 146: Port Role Descriptions

	RSTP (802.1w)	Description
	Port Role	Description
	Port Role
	Root	The port that receives the best BPDU on a bridge.

	Designated	The port can send the best BPDU on the segment to which it is connected.

	Alternate	The port offers an alternate path, in the direction of root bridge, to that provided by bridge’s root
		port.

	Backup	The port acts as a backup for the path provided by a designated port in the direction of the spanning
		tree.

The show spantree command (configuration mode) output reveals the state and port role.

(host) (config) #show spantree

Designated Root MAC	00:0b:86:50:3c:20
Designated Root Priority 32768
Root Max Age 20 sec	Hello Time 2 sec Forward Delay 15 sec
Bridge MAC	00:0b:86:50:3c:20
Bridge Priority	32768

Configured Max Age 20 sec			Hello Time 2 sec Forward Delay 15 sec
Rapid Spanning-Tree port configuration
--------------------------------					P-to-P	Role
Port	State	Cost	Prio	PortFast	P-to-P	Role
----	-----	----	----	--------	------	----
FE 1/0	Discarding	0	128	Disable	Enable	Disabled
FE 1/1	Forwarding	0	128	Disable	Enable	Designated
FE 1/2	Forwarding	0	128	Disable	Enable	Root
FE 1/3	Discarding	0	128	Disable	Disable	Disabled
FE 1/4	Discarding	0	128	Disable	Enable	Alternate

Also, the show spanning-tree interface command indicates the state and roles; see the partial output below.

(host) #show spanning-tree interface fastethernet 1/1

Interface FE 1/7 (port 8) in Spanning tree is FORWARDING

Port path cost 19, Port priority 128 Role DESIGNATED

486 RSTP

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Dell 6.2 manual Rstp 802.1w Description Port Role

Models: 6.2

RSTP (802.1w) Port State

RSTP (802.1w)

Description

Port Role

Backup

6.2 specifications