Resetting Etherchannel Distribution

[hobbes80]

I'm running an Etherchannel that isn't using LACP or PAgP, the group balances based on mac-address or IP address. I want to know how to:
A) know which IP/MAC is assigned to which port in the group
B) How to reset them and have them reassigned

The reason being is that I have a bunch of servers that were connected when they were not doing anything, and are now hitting the network hard and I surmise they are on the same channel because I'm seeing poor performance across the connection. When I bring in a new server, it talks across the connection just fine. I rebuilt one of those servers, changed it's IP address and reconnected it and it has good throughput now. While I'm not ruling out my older servers could just be slow, I'd like to be able to rule out the ports as well...
Especially since I'll start copies from 4 identical servers going to the same device hanging off a 4 port ether-channel and some will transfer at 40GB/hour and others transfer at 5GB/hour...

Thanks in advance,
--Andrew

 

[RookThis]

I'm assuming you are running IOS, if that's the case you just remove the channel-group definition from the interface. Then you just configure that interface to whatever you need to setup for it.

As for the mac/ip:

enter this command:

show mac-address-table dynamic interface <interface>

Then go to the router and enter show arp | inc <mac>

 

[chieftan999]

Have you tried monitoring the etherchannelled ports......

Put a sniffer on and see what amount of traffic is coming in on what port....

Etherchannelling (If set correctly) should load balance across the ports....

How many ports are you using for etherchannelling?

Reamin positive. The affect on those around you will amaze.

 

[hobbes80]

I'm using 4 ports for the etherchannel... I guess I didn't think of that, run a maintenance cycle on each server to generate some traffic and then span the ports individually and sniff them to see which is on which...
Seems to me there should be an easy way to see how they are assigned across the channel...

the "show mac-address-table dynamic interface <interface>" just gives me the address that is plugged into that port.

I'll give the sniffer a shot.
Thanks,
--Hobbes

 

[chieftan999]

Providing all four ports are in the same etherchannel group then it should load balance and give you redundancy.

How are the servers connected to the Switch?

If the servers only have 1 nic installed and are only connected to 1 port on the Switch, how can you etherchannel it?
Any packets that the server sends out, the receipt will only come back through the 1 port!!!!!!!!


Reamin positive. The affect on those around you will amaze.

 

[hobbes80]

The servers each have 1 port going to that VLAN.
The NAS array has 8 ports connected to the switch. 4 active, 4 redundant, each setup in an Etherchannel. the active is int po1 and the redundant is po11...

The servers accessing the NAS array should be load-balanced over the etherchannel by MAC address (L2 settings), what I want to know is which server is assigned to which channel of the 4 port etherchannel because I am experiencing an issue where 1 server transfers at 45GB an hour and another server can only transfer at 5GB an hour. At this point I'm sniffing the ports individually and tracking it down by IP address. It was my hope that I could show a table of some sort that shows how they are balanced, if that is not the case, I can just do it the long way...

--Hobbes