VLAN and trunk group using LACP

[Meterior]

Dear all,

I have a scenerio like this:
SW2910 Fa1---------Fa1
fa2---------Fa2 SW2910
I configure two VLAN and load balancing over two physical trunk between switches but it doesn't work


Switch1(config)# ip routing
Switch1(config)# trunk 1,2 trk1 lacp
Switch1 (vlan-1)# tagged trk1
Switch1 (vlan-2)# tagged trk1

Switch2(config)# ip routing
Switch2(config)# trunk 1,2 trk1 lacp
Switch2 (vlan-1)# tagged trk1
Switch2 (vlan-2)# tagged trk1

Please help me how can i make i work.

[Shadow13]

1st i'm not sure why you enabled routing in both switches ?

2nd, can you please specify how "it doesn't work" ?

can you please post the output of "show lacp" from both switches.

[Meterior]

Dear Shadow13,

I think "ip routing" will help routing between 2 vlan on both switches
- The output of lacp, as attached file

Please see and give me solution.

Thanks for all help

[Meterior]

Hi,

Does anyone answer me ?

[Jeff Carrell]

So the question still is, what does not work?

Trunking is not "load balancing", it is only "load sharing".

The load sharing algorithm is based on source-destination mac addresses at each switch as it sends to packets across a link in the trunk.

Therefore, sometimes all traffic may go over one link even if there are two links available.

hth...Jeff

[Meterior]

Hi,

Thank Jeff,
It's true. When i show the ip routing on switch2, there was no information about any vlan. I didn't work as you said.
I just wonder if does spanning tree concern with LACP ?

[Jeff Carrell]

Meterior asked: "I just wonder if does spanning tree concern with LACP ?"

Spanning tree sees the LACP link as a single link and calculates accordingly.

Added bonus, when you enable spanning tree, the LACP link gets an automatic port cost of 4, which makes it a more favorable link if there additional non-LACP links connecting the 2 switches.

hth...Jeff

[Meterior]

Thanks for all help!