3750 Lacp problem

[extra_groovey]

Hello Forum,

My name is Chris and I am a novice when it comes to the Cisco world but slowly trying to learn.... I have a 24 port 3750 the problem I am having is that I have configured lacp into 3 group channel's of 2 ports per channel and I am unable to transfer between the connections at the desired speed that 2 gig ports provide.

At present I have 2 computers , 1 server and 2 qnap's that are on my network at home and would like the server to transfer information to both nas at 2gig... in the switch the etherchannel summary shows the ports are grouped and working correctly.

Example 1

My Server with 2 Ethernet ports running windows server 2012 in lacp to Qnap TS-651 configured in lacp transfer only at 115mb/sec which is not desirable   Total bandwidth 115mb/sec

Example 2

Nas to Server and additional pc both at same time two streams of only 115MB/sec     Total bandwidth 230MB sec shown so lacp is working

Example 3

Server 2012 file transfer to both nas concurrent transfer at 115mb/sec so lacp is working but not in 1 single stream.

Total Bandwidth 230MB/sec shown

I am at a loss... its as if file transfers between group channels will not transfer to 2gig speeds in a single file transfer but multiple transfers from multiple sources will saturate the total bandwidth of the 2gig links when i test all 3 group channels 

Below I have attached a photo and text file of etherchannel summary and show run.

I would appreciate any advice. 

[extra_groovey]

Photo of etherchannel summary

[extra_groovey]

Text file of 

Show run!

[Julio E. Moisa]

Hi

Are the servers NICs running to Giga?

[extra_groovey]

yes both are gig connections and have been bonded.

2 file transfer's from server to multiple computers will have a total transfer speed of 230mb/sec which I have monitored in the server network stat's

[Julio E. Moisa]

Thank you, are the servers running as NIC teaming?

Please check this link:

http://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/98469-ios-etherchannel.html#server_config

[extra_groovey]

Yes, I have also tried qnap to qnap to cut windows out of the picture no luck

here are the pics of the server

[Julio E. Moisa]

Thank you

Try to configure the load-balance per source MAC on the switches and try again.

port-channel load-balance src-mac

[extra_groovey]

I have run the command and no luck transfer's are still 115mb/sec

[extra_groovey]

.

[Iulian Vaideanu]

Packets belonging to the same stream (flow) will always use the same switch port in an etherchannel - traffic distribution among members of an etherchannel can be done based on source/destination mac address, source/destination ip address, sometimes source/destination tcp/udp port...  but as long as the parameters of the chosen hashing algorithm don't change, neither does the port used to send the traffic.

If you only have one source and one destination across an etherchannel on a 3750 (which can only hash based on mac or ip), bonding ports is pretty much useless...

[extra_groovey]

Thank you Lulian for the quick reply,

I if use 2 3750's with lacp between the switches will this get around the problem you mentioned?

[Iulian Vaideanu]

It only depends on the number / distribution of senders and receivers of traffic, no matter the number of switches in between (every switch on the way that needs to send traffic through a port-channel will use the same interface for all packets of the same flow).

What could help a little is a switch that could also distribute traffic based on TCP/UDP port numbers (not only mac and IP) - that way, multiple flows between a single sender and a single receiver might use both members of the port-channel...