Cisco NM-16ESW - EtherSwitch Switch Manual de usuario descargar pdf (Pagina 30)

Configuring the Cisco Gigabit EtherSwitch EHWIC

How to Configure Gigabit EtherSwitch EHWICs

Configuring the Cisco Gigabit EtherSwitch EHWIC

OL-23155-01

Enabling Spanning Tree

You can enable spanning tree on a per-VLAN basis. The switch maintains a separate instance of

spanning tree for each VLAN (except on VLANs on which you disable spanning tree).

Note Spanning tree is enabled by default on all VLANs when they are created and the ports become members

of that VLAN.

To enable spanning tree on a per-VLAN basis, use the spanning-tree vlan vlan_ID command in global

configuration mode.

Verifying Spanning Tree

Use the show spanning-tree vlan to verify spanning tree configuration.

Router#show spanning-tree vlan 1

VLAN1 is executing the ieee compatible Spanning Tree protocol

Bridge Identifier has priority 32768, address 0025.451b.b22a

Configured hello time 2, max age 20, forward delay 15

Current root has priority 32768, address 0008.e36d.9f70

Root port is 18 (GigabitEthernet0/1/4), cost of root path is 38

Topology change flag not set, detected flag not set

Number of topology changes 11 last change occurred 02:43:01 ago

from GigabitEthernet0/1/2

Times: hold 1, topology change 35, notification 2

hello 2, max age 20, forward delay 15

Timers: hello 0, topology change 0, notification 0, aging 300

Port 16 (GigabitEthernet0/1/2) of VLAN1 is forwarding

Port path cost 4, Port priority 128, Port Identifier 128.16.

Designated root has priority 32768, address 0008.e36d.9f70

Designated bridge has priority 32768, address 0025.451b.b22a

Designated port id is 128.16, designated path cost 38

Timers: message age 0, forward delay 0, hold 0

Number of transitions to forwarding state: 1

BPDU: sent 9810, received 1

Router#

Configuring Spanning Tree Port Priority

Beginning in global configuration mode, follow these steps to configure the spanning tree port priority

of an interface.

SUMMARY STEPS

1. interface gigabitethernet 0/slot/port

2. spanning-tree port-priority port_priority

3. spanning-tree vlan vlan_ID port-priority port_priority

4. end

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Cisco NM-16ESW - EtherSwitch Switch Manual de usuario Pagina 30