Bandwidth on Port-etherchannel

[Lawrence Chia Chao Xian]

Hey Guys,

I am doing up a etherchannel of 4 x physical 100Mb port and I am seeing a 100Mb bandwidth on the port channel?

Is that an issue?

[Jon Marshall]

Do you mean when you do a "sh interface po" you are seeing only 100Mb ?

If so is your etherchannel working ie. "sh etherchannel"

What is the switch and IOS version.

Jon

[Lawrence Chia Chao Xian]

Hey Jon,

It is working

show etherchannel

                Channel-group listing:

                ----------------------

Group: 1

----------

Group state = L2

Ports: 3   Maxports = 8

Port-channels: 1 Max Port-channels = 1

Protocol:   PAgP

IOS:c3750-ipservicesk9-mz.122-35.SE5

[Jon Marshall · Accepted solution]

Lawrence

So do you mean the actual bandwidth figure under the port-channel ?

Apologies but i meant to ask for "sh etherchannel summary". Can you post that.

Jon

[ankugarg · Accepted solution]

Make sure you are looking for this BW only--

4-mem-stack#sh int po1

Port-channel1 is up, line protocol is up (connected)

  Hardware is EtherChannel, address is 04c5.a473.8c01 (bia 04c5.a473.8c01)

  MTU 1500 bytes, BW 2000000 Kbit/sec, DLY 10 usec,

Also let us know which two switches are connected in addition to info asked by Jon.

[Lawrence Chia Chao Xian]

Hey Jon and Ankur,

I had rebooted the switch and when it came up the Port-channel reflected the bandwidth correctly. I will monitor and see.

Many thanks for your assistance!

[Lawrence Chia Chao Xian]

Hey Guys,

I got 1 more problem.

Topology:

LAN - 3750G (A) - (4 x 100Mb links aggregated into 1 port-channel) 3750 (B) - Internet

I am doing source mac address base loadbalancing on 3750G (L2) at A and the Service Provider is running destination mac address loadbalancing on the 3750 (L2) at B.

I am not able to get an aggregated bandwidth of more than 100Mb upload on the port-channel at the 3750G at A when various places from the Internet is doing a download from my server behind LAN.

Is that the expected behavior?

[ankugarg]

I think this might be expected...Since your switch is L2,so all the packets passing through Switch (3750G (A)) will have same source mac address...Since load balancing is done using src mac address,so all the packets will take the same port of the etherchannel...Etherchannel load balancing is not the equal cost load balancing..It is distributed based on the criteria used for load balancing...You should try to use other load balancing criteria like Dest IP to get more bandwidth.