[c-nsp] Etherchannel load balancing

[Ivan Šimko]

Hi Billy

thanks a lot. Can you send me that doc? Link isn't working :-(

Regards

Ivan

On 24 June 2010 14:16, Billy Guthrie <bg at billyguthrie.com> wrote:

> When you configure an etherchannel bundle, the frames are distributed
> across the individual bundled links deterministically; however, the load is
> not balanced equally across all the links. You may or may not know, but the
> frames are forwarded on a specific link due to the hashing algorithm that is
> used. The algorithm can use destination IP address, source IP address, or a
> combination of both source and destination IP addresses, source and
> destination MAC addresses, or TCP and UDP port numbers. The hashing
> algorithm computes a binary pattern that selects a link number in a bundle
> to carry each frame.
>
> Document may or may not help:
>
> http://www.cisco.com/en/US/tech/tk389/tk213/technologies_tech_note09186a0080094714.shtm
>
>
> Good Luck
> Billy
>
>
> Ivan Šimko wrote:
>
>> Hi all
>>
>> I've got two switches 3560
>> group with 2xFE on both switches and inteconnected together.
>> port channel is L2
>> 2 VRFs - ivan, mark
>> 4 VLANs:
>> - vlan 100 VRF "ivan" for interconnection between swtiches
>> - vlan 11 VRF "ivan" for customer's connection
>>
>> - vlan 200 VRF"mark" for interconnection between switches
>> - vlan 12 VRF "mark" for customer's connection
>>
>> ports 12 and 13 as trunks
>> - interconnection between switches
>>
>> OSPF runs over SVIs of 100 and 200.
>>
>> I'm strugling with load balancing:
>> when I setup port channel load balancing dst-ip switch does correct
>> balancing between interconnected vlans but not for customers' vlans.
>> - vlan 100 would use port 12 - switch interconnection
>> - vlan 200 would use port 13 - switch interconnection
>> - vlan 11 would use port 13 - customer 1
>> - vlan 12 would use port 13 - customer 2
>>
>> when I setup port channel load balancing src-dst-ip switch does correct
>> balance for customers' vlans but not for interconnected vlans.
>> - vlan 100 would use port 13
>> - vlan 200 would use port 13
>> - vlan 11 would use port 12
>> - vlan 12 would use port 13
>>
>> Result is not full bandwidth used for both customers' traffic resp. only
>> 100
>> Mbps.
>>
>>
>> Any ideas how to sort it out?
>>
>> thanks
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>>
>>
>
>