How to configure the link aggregation on layer 3 switch?

[ssweehinlew]

How to configure the link aggregation on layer 3 switch and disable spanning tree? Can show me sample? for example, 2 ports from switch A to 2 ports of switch B.

[Leo Laohoo]

Configuring Layer 3 and Layer 2 EtherChannel

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/channel.html

[ssweehinlew]

Below is the configuration from the switch. The etherchannel summary is showing the status (SD). Should I put SW2(config-if-range)# no switchport? Port 1 and 2 are the trunk ports.

SW1# configure terminal

SW1(config)# interface port-channel 1

SW1(config-if)# end

SW1# configure terminal

SW1(config)# interface range gigabitethernet1/1 -2

SW1(config-if-range)# channel-group 1 mode on

SW1(config-if-range)# end

SW2# configure terminal

SW2(config)# interface port-channel 1

SW2(config-if)# end

SW2# configure terminal

SW2(config)# interface range gigabitethernet1/1 -2

SW2(config-if-range)# channel-group 1 mode on

SW2(config-if-range)# end

[altheb_5]

Hi

EtherChannel you need it is L3 (mean use IP address)

Or L2 EtherChannel

Then there are 3 protocols you can use it: LACP, PaGp, Static

Let me know to provide you all configuration

Any question please ask

[ssweehinlew]

It will be good if you can provide me sample etherchannel L2 configuration (without IP address) and etherchannel L3 configuration on trunk port. It has spent me the whole day to try it out. Thanks.

[altheb_5]

Ok ,

Etherchannel :

LACP: Standard Protocol --- have two modes Active and Passive

PagP : Cisco Property  ---- have two mode Auto and Desirable

On     : Static

You can read about it for more info

L2 Channel Group Configuration using LACP (Link Aggregation Control Protocol) and Trunk:

Sw 1 connect to Sw2

Sw1 Ports F0/1 - F0/2

Sw2 Ports F0/1 - F0/2

Sw 1 Configuration :

First make sure the interfaces returned to default by using :  default inter f0/1

Interface range F0/1 - 2

Shutdown

Channel-group 1 mode Active

Exit

Inter PO 1

Switchport mod trunk

Switchport trunk encap dot1q

And you can use any configuration

Keep the ports Shutdown

Sw 2 Configuration:

Interface range F0/1 - 2

Shutdown

Channel-group 1 mode Passive

Exit

Inter PO 1

Switchport mod trunk

Switc port trunk encap dot1q

And you can use any configuration

Now do no shutdown for to interfaces.

For troubleshooting:

show channel summ

show span vlan 1 ( must STP see the port channel (Po1) not F0/1 and F0/2 )

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L3 Channel Group Configuration using LACP (Link Aggregation Control Protocol)

Sw 1 Configuration:

interface range F0/1 - 2

no switchport ---- to act as L3 port

shutdown

channel-group 1 mode Active

exit

inter PO 1

ip address XXX.XXX.XXX.XXX

and you can use any configuration

keep the ports Shutdown

Sw 2 Configuration :

interface range F0/1 - 2

no switchport ---- to act as L3 port

shutdown

channel-group 1 mode Active

exit

inter PO 1

ip address XXX.XXX.XXX.XXX

and you can use any configuration

now do no shutdown for to switches

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the traffic will send it over the two links (Load Balance)