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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