Cisntwk50 Stp And Etherchannel

Front 1

Disabled port state

Back 1

A port in the disabled state is powered on but does not participate in forwarding or listening to network messages. A bridge must be manually place in the disabled state

Front 2

Blocking

Back 2

When a device is first powered on its ports are in the blocking State

. Parts in a blocking State receive packets and BPDUs sent to all bridges, but they will not process any other packets

Backup bridgeport's are always in the blocking state

Front 3

Listening

Back 3

Switches that are exchanging configtn information to define their roles are in the listening state

The listening state is a transitory State between blocking and learning. The port remains in the listening state for a specific period Of time. This time period Allows Network traffic to settle down after a change has occurred. For example, if a bridge goes down, all other Bridges go into listening state for a period Of time. During this time, the bridges redefine their roles

Front 4

Learning

Back 4

A port in the learning state receives packets and builds the bridge database(MAC addresses to ports) but does not FWD the packet. a timer is associated with this state. The port goes to the forwarding state after the timer expires

Front 5

Forwarding

Back 5

Every bridge and designated bridges are in the forwarding State when they can receive and forward packets are in the forwarding state and learn at forward. All ports of the routes are in the forwarding state

Front 6

Switch(config)#spanning-tree mode {pvst | rapid-pvst}

Back 6

Sets the spanning tree mode

Front 7

Switch(config)#spanning-tree vlan [1-4094] root primary

Back 7

Forced to the switch to be the root of the spanning tree

Front 8

Switch(config)#spanning-tree vlan [1-4094] cost [1-200,000,000]

Back 8

Manually set the cost

-short range mthd: 1 - 65536

-long range method: 1 - 200000000

Front 9

Switch(config)#spanning-tree vlan [1-4094] priority [0-61440]

Back 9

Manually sets the bridge priority number

- a switch has default priority of 32768

- increments of 4096

- lowest priority number becomes root Bridge

Front 10

Switch(config)#no spanning-tree vlan [1-4094]

Back 10

Disable spanning Tree on the selected VLAN

Front 11

Switch#show spanning-tree

Back 11

Show spanning tree configuration information

To verify spanning tree is working, look for something like this for each VLAN:

" spanning tree enabled protocol ieee"

Front 12

Switch#show spanning-tree vlan [1-4094] root

Back 12

Shows information about the root bridge for a specific VLAN

Front 13

Switch#show spanning-tree vlan [1-4094] bridge

Back 13

Show spanning tree configuration information about the local switch for the specified VLAN. Such as local bridge ID, priority and MAC address

Front 14

Switch(config-if)#channel-protocol lacp

Switch(config-if)#channel-protocol pagp

Back 14

Sets the EtherChannel protocol on the interface

Front 15

Switch(config-if)#channel-group [1-8] mode auto

Switch(config-if)#channel-group [1-8] mode desirable

Back 15

Selects the PAgP mode on the interface

Front 16

Switch(config-if)#channel-group [1-8] mode active

Switch(config-if)#channel-group [1-8] mode passive

Back 16

Set the LACP mode on the interface

Front 17

Switch(config-if)#no channel group [1-8]

Back 17

Disables EtherChannel on the interface

Front 18

Switch#show etherchannel

Back 18

Displays etherchannel details

Front 19

Switch#show etherchannel summary

Back 19

Displays info for a Channel with a one-line summary per Channel group