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Hi,
I have a NS-480 here that I am trying to get LACP working on with a stacked pair of Dell PowerConnect 6248 switches.
I currently have two other LACP links on the Dell switches (for uplink and for another server on the switches). Using the same configuration on the PowerConnects as the other links for the NS-480 links (only using cge0/1 on both data movers) results in the LACP link not coming up at all with the following errors reported in the logs (from the Celerra):
Facility: DRIVERS
Description: LAP_Port::receive_LACP len=114 expected_len=110
This message is repeated over and over again, which I assume is why LACP is not working.
Has anyone got LACP working between EMC gear and a PowerConnect switch before? For troubleshooting purposes I also tried setting LACP up on a single switch (non stacked) incase that was causing any issues with no luck.
I had a look at the logs from the Dell switch but there doesn't appear to be anything meaningful in them.
Thanks
What is the status of your LACP connection on the NAS? You could get it by running the following:
server_sysconfig server_2 -v (this will list out your virtual devices)
server_sysconfig server_2 -v -i DEVICE_NAME (this will give you the status of the device, and if LACP is configured on it)
Thanks.
- Sebby Robles
Hi Sebby,
The output is as follows:
server_2 :
*** Trunk cge-lacp0: Link is Down ***
*** Trunk cge-lacp0: Timeout is Short ***
*** Trunk cge-lacp0: Statistical Load Balancing is IP ***
Device Local Grp Remote Grp Link LACP Duplex Speed
------------------------------------------------------------------------
cge0 10002 0 Up Down Full 1000 Mbs
cge1 10002 0 Up Down Full 1000 MbsAlso, the relevant config on the switch is as follows:
interface ethernet 1/g2
channel-group 48 mode auto
description 'ns480 server_2 cge0'
spanning-tree portfast
exitinterface ethernet 2/g2
description 'ns480 server_2 cge1'
channel-group 48 mode auto
spanning-tree portfast
exitinterface port-channel 48
description 'ns480 server_2 cge-lacp0'
spanning-tree portfast
switchport access vlan 20
exitRainer_EMC
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Posted September 23rd, 2010 11:00
the difference of 4 bytes is a bit curious - do you have by any chance VLAN tagging configured on one side but not on the other?
Rainer
gbarretoxx1
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Posted September 23rd, 2010 14:00
Hi,
change this :
channel-group 48 mode auto
to :
channel-group 48 mode active
Gustavo Barreto.
Rainer_EMC
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Posted September 23rd, 2010 15:00
PAgP ?
gbarretoxx1
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Posted September 23rd, 2010 15:00
Hi Rainer,
No. This is for LACP. This needs to be set to "active" on the switch side.
##################################################################################################################################
channel-group
To assign and configure an EtherChannel interface to an EtherChannel group, use the channel-group command. Use the no form of this command to remove the channel-group configuration from the interface.
channel-group number mode {active | on | {auto [non-silent]} | {desirable [non-silent]} | passive}
no channel-group number
Syntax Description
##################################################################################################################################
gbarretoxx1
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Posted September 23rd, 2010 15:00
Hi Rainer,
No. This is for LACP. This needs to be set to "active" on the switch side.
channel-group
To assign and configure an EtherChannel interface to an EtherChannel group, use the channel-group command. Use the no form of this command to remove the channel-group configuration from the interface.
channel-group number mode {active | on | {auto [non-silent]} | {desirable [non-silent]} | passive}
no channel-group number
Syntax Description
Gustavo Araujo wrote:
change this :
channel-group 48 mode auto
to :
channel-group 48 mode active
Hi Gustavo,
On the switches (Dell PowerConnect 6248's) we don't seem to have that option, as I think that is from the Cisco docs:
console(config-if)#channel-group 48 mode ?
auto Force the port to port-channel with lacp.
on Force the port to port-channel without lacp.I had a look in the port-channel interface configuration and can't see any way there to make it active either, although on the interfaces I can see the BPDU's being sent/received.
Rainer_EMC wrote:
the difference of 4 bytes is a bit curious - do you have by any chance VLAN tagging configured on one side but not on the other?
RainerHi Rainer,
At the moment on both ends there is no VLAN tagging configured and as a test I removed the VLAN altogether on the switch (there is no VLAN setup on the EMC side of things) with the same results.
Please let me know if you would like any more information.
Rainer_EMC
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Posted September 24th, 2010 04:00
Hi Gustavo,
that's what I meant - since the Celerra doesn't speak PAgP (like another Cisco switch would) the ports of the switch need to specifically configured which aggregation protocol to use
Rainer
gbarretoxx1
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Posted September 24th, 2010 07:00
Hi,
Please, refer to emc247936.
" The Dell switch sends 128 byte LACP packets, with four extra bytes at the end. The Data Mover appears to have a check for the length of the packet and it fails if it does not match, regardless of its contents."
There are patches for 5.6.49 that contains an enhancement to support this switch.
Gustavo Barreto.