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802.3ad dynamic link aggregation and Intel Pro/1000 MT NICs

patrick.peters
Level 1
Level 1

I've got a Dell 2850 server with 2 Intel PRO/1000 MT NICs built in. I'm trying to create an etherchannel using 802.3ad dynamic link aggregation. I have created the team on the server (there aren't many options to specify). On the switch side, I've got a 2970 running 12.2(25)SEB (the very latest).

Here's the output from sho etherchannel detail:

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

cisco-2970-b#sho etherchannel detail

Channel-group listing:

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

Group: 1

----------

Group state = L2

Ports: 2 Maxports = 8

Port-channels: 1 Max Port-channels = 1

Protocol: PAgP

Ports in the group:

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

Port: Gi0/19

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

Port state = Up Sngl-port-Bndl Mstr Not-in-Bndl

Channel group = 1 Mode = Desirable-Sl Gcchange = 0

Port-channel = null GC = 0x00010001 Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = PAgP

Flags: S - Device is sending Slow hello. C - Device is in Consistent state.

A - Device is in Auto mode. P - Device learns on physical port.

d - PAgP is down.

Timers: H - Hello timer is running. Q - Quit timer is running.

S - Switching timer is running. I - Interface timer is running.

Local information:

Hello Partner PAgP Learning Group

Port Flags State Timers Interval Count Priority Method Ifindex

Gi0/19 U4/S4 H 30s 0 128 Any 10119

Age of the port in the current state: 00d:00h:17m:14s

Port: Gi0/21

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

Port state = Up Sngl-port-Bndl Mstr Not-in-Bndl

Channel group = 1 Mode = Desirable-Sl Gcchange = 0

Port-channel = null GC = 0x00010001 Pseudo port-channel = Po1

Port index = 0 Load = 0x00 Protocol = PAgP

Flags: S - Device is sending Slow hello. C - Device is in Consistent state.

A - Device is in Auto mode. P - Device learns on physical port.

d - PAgP is down.

Timers: H - Hello timer is running. Q - Quit timer is running.

S - Switching timer is running. I - Interface timer is running.

Local information:

Hello Partner PAgP Learning Group

Port Flags State Timers Interval Count Priority Method Ifindex

Gi0/21 U4/S4 H 30s 0 128 Any 10121

Age of the port in the current state: 00d:00h:17m:15s

Port-channels in the group:

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

Port-channel: Po1

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

Age of the Port-channel = 00d:00h:17m:40s

Logical slot/port = 10/1 Number of ports = 0

GC = 0x00000000 HotStandBy port = null

Port state = Port-channel Ag-Not-Inuse

Protocol = PAgP

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

It looks like everything is defined ok, but it's just not aggregating for some reason. On the server side, Intel PROSet shows the status of one NIC as active and the other as Standby.

Anybody got ideas for me? This is my first etherchannel, so I'm hoping there's just something obvious that I'm missing....

Thanks

Pat

4 Replies 4

aashish.c
Level 4
Level 4

Hi,

make sure that settings in intel NICs are correct. Also make sure that they r using PAGP as FEC protocol. also check STP settings. I suspect that NICs are detecting links seperately and STP is putting one link in blocking.

kindly update

aashish C

amikat
Spotlight
Spotlight

Hi,

To support 802.3ad you should run LACP, NOT PAgP which is Cisco proprietary.

Will you please try "channel-group mode" with the parameter "active" or "passive".

Best regards,

Antonin

aashish.c
Level 4
Level 4

Hi,

I checked the documentation of Intel 1000 PRO/MT and they use LACP (IEEE) protocol for etherchannel (802.3ad). So change your switchport settings to use LACP.

Here is the link to setup LACP on cat2970 :

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2970/12225sea/2970scg/swethchl.htm#wp1154336

kindly update

regards

aashish C

It looks like changing to LACP fixed the problem. Thanks!

Pat