Alcatel-Lucent 6850-48 Network Guide

Sample Spanning Tree Configuration

Configuring Spanning Tree Parameters

page 13-42

OmniSwitch AOS Release 6 Network Configuration Guide

September 2009

4 Change the bridge priority value for VLAN 255 on Switch D to 10 using the following command
(leave the priority for VLAN 255 on the other three switches set to the default value of 32768):

-> bridge 255 priority 10

VLAN 255 on Switch D will have the lowest Bridge ID priority value of all four switches, which will
qualify it as the Spanning Tree root VLAN for the VLAN 255 broadcast domain.

Note. To verify the VLAN 255 Spanning Tree configuration on each switch use the following show
commands. The following outputs are for example purposes only and may not match values shown in the
sample network configuration:

-> show spantree 255

Spanning Tree Parameters for Vlan 255

Spanning Tree Status : ON,

Protocol :

IEEE 802.1W (Fast STP),

mode : 1X1 (1 STP per Vlan),

Priority :

32768(0x0FA0),

Bridge ID :

8000-00:d0:95:00:00:04,

Designated Root : 000A-00:d0:95:00:00:01,

Cost to Root Bridge :

Root Port :

Slot 3 Interface 8,

Next Best Root Cost : 0,

Next Best Root Port : None,

Tx Hold Count : 6,

Topology Changes : 3,

Topology age : 0:4:37

Current Parameters (seconds)

Max Age = 30,

Forward Delay = 15,

Hello Time = 2

Parameters system uses when attempting to become root

System Max Age = 30,

System Forward Delay = 15,

System Hello Time =

-> show spantree 255 ports

Spanning Tree Port Summary for Vlan 255

Adm Oper Man. Path Desig Prim. Op Op

Port Pri St St mode Cost Cost Role Port Cnx Edg Desig Bridge ID

-----+---+---+----+----+-----+-----+----+-----+---+---+----------------------

3/8

7 ENA FORW No

ROOT 3/8 NPT Edg 000A-00:d0:95:00:00:01

3/9

7 ENA BLOCK

48 BACK 3/9 NPT No 8000-00:d0:95:00:00:04

3/10

7 ENA BLOCK No

48 ALTN 3/10 NPT No 8000-00:d0:95:00:00:03