06-10-2012 12:29 PM - edited 03-07-2019 07:10 AM
Hi,
I've to put 4 ports in Layer-3 port channel. will all 4 ports be passing the traffice once this port-channel starts functioning?
Thanks...
06-10-2012 01:23 PM
Traffic will be automatically load-balanced between all 4 ports.
So yes, they all will be passing traffic.
06-10-2012 07:25 PM
As Ashwin said, all the 4 ports would be load balancing. Just to add, the default load balancing algorithm would be src-dst-ip. It would be a flow based algorithm (i.e a session between one specific source & destination will always use one link till the time the session is not expired).
06-11-2012 12:14 AM
ya as ashwin said traffic will be automatically load-balance between all 4 port if any port is going down state then also they distribute all the traffic equal in remaining 3 port as per algorithm.
06-15-2012 07:11 PM
Thanks All. How do we change it to do "per-packet" load balancing?
06-15-2012 11:44 PM
Hello Gavin,
How do we change it to do "per-packet" load balancing?
In short, you don't. Cisco switches do not support per-packet load balancing method on EtherChannels. The primary reason is the possibility of frame reordering which is undetectable at Ethernet and IP layer and may cause serious trouble for the communicating applications.
With EtherChannels, you should make an educated guess as to which address fields (source/dest MAC, source/dest IP, source/dest L4 port) in the outbound traffic are the ones that vary the most, and configure your EtherChannel load balancing method to base its decision upon these most varying address fields. The options usually are:
SW-Dist1(config)# port-channel load-balance ?
dst-ip Dst IP Addr
dst-mac Dst Mac Addr
src-dst-ip Src XOR Dst IP Addr
src-dst-mac Src XOR Dst Mac Addr
src-ip Src IP Addr
src-mac Src Mac Addr
Some higher-level switches may also allow you to use L4 port information (this 3560 running IP Base does not).
Best regards,
Peter
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