01-23-2010 10:13 AM
interface port-channel62
switchport mode trunk
interface Ethernet107/1/37
description NAS DATAMOVER L cge2
switchport mode trunk
channel-group 62 mode active
NEXUS-2-5010-B(config-if)# int e107/1/38
NEXUS-2-5010-B(config-if)# channel-group 62 mode act
port channel cannot have more than 1 members
Please note that I am trying to configure multiple interfaces on the FEX not on the 5010...
02-22-2011 02:20 AM
Where I can find cisco's official documentation on this problem?
Is possible that NX-OS 5 has fixed it?
BR,
Dave
02-22-2011 02:34 AM
I had the same problem - the only fix is to buy 2248 instead of 2148 - is some broken design in the asic's as far as I know
best regards /ti
02-22-2011 08:10 AM
There is nothing broken or any kind of design flaw here. This is a hardware limitation with the Nexus 2148 platform. This was our first FEX and at the time there was no support in n2k hardware to support more than one link in a portchannel from the fex to the host. Since this is a hardware limitation there wont be any software fix for it.
The current documentation is here:
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps10110/data_sheet_c78-507093.html
Table 9 - Layer 2 Features
PortChannel on server ports on Cisco Nexus 2200 platforms
Note: The platform says Nexus 2200. It does not account Nexus 2148.
03-14-2013 10:01 AM
Hello Lucein,
I am facing the same issue but while trying to connect my 2248 ports to NetApp FAS3200 Dual Controller.
The 10Gig connection works fine with vpc 13 and vpc 14 as follows (member ports are 5548 ports):
interface port-channel13
description 10G connection to NetApp_Controller1
switchport mode trunk
switchport trunk allowed vlan 161
spanning-tree port type edge trunk
speed 10000
duplex full
vpc 13
interface port-channel14
description 10G connection to NetApp_Controller2
switchport mode trunk
switchport trunk allowed vlan 161
spanning-tree port type edge trunk
speed 10000
vpc 14
But when I use for 2248 ports which are connected a dual-homed (EvPC) to both 5Ks, I get the error '
operation failed vpc already exists' when I try to use vpc 17 for e102/1/17 & e103/1/17 and vpc 18 for e102/1/18 & e103/1/18.
--------------------------------------------------------------------------------
Group Port- Type Protocol Member Ports
Channel
--------------------------------------------------------------------------------
17 Po17(SU) Eth LACP Eth102/1/17(P) Eth103/1/17(P)
18 Po18(SU) Eth LACP Eth102/1/18(P) Eth103/1/18(P)
However, they are up in PO right now but I can't add them to vpc. No matter what vpc number I use. It gives the same error.
Please help.
02-27-2011 08:09 AM
Hi David
You have to use 2 separate vPCs, each made of "2" interfaces and splitting vlans, or use server's TLB (Transmit Load balancing) as described in following design guide
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/C07-572829-01_Design_N5K_N2K_vPC_DG.pdf
Page 37 and figure 29
Thanks
Hatim Badr
04-09-2013 09:31 AM
Hatim,
Good reference, many thanks.
Nik
06-30-2014 04:47 AM
Hi,
I had the same problem, but with slightly different models.
My setup used a Nexus 5548 and 2248 FEX.
The fix to the problem, shut down the uplink ports on the 5548 and disassociate the physical ports with the port channel and delete the port channel.
Next, reassign the two uplink ports to the FEX and recreate the port channel. This allowed me to apply the necessary configuration without error messages. I have provided an example below of the steps carried out.
show FEX - confirmation FEX is online and ports associated.
FEX: 104 Description: FEX104-Po104 state: Online
FEX version: 7.0(2)N1(1) [Switch version: 7.0(2)N1(1)]
FEX Interim version: 7.0(2)N1(1)
Switch Interim version: 7.0(2)N1(1)
E
Fabric interface state:
Po104 - Interface Up. State: Active
Eth1/18 - Interface Up. State: Active
Eth1/26 - Interface Up. State: Active
Fex Port State Fabric Port
show port-channel - confirmation port-channel has been built, but only one port assigned
104 Po104(SD) Eth NONE Eth1/18(D)
initial configuration applied and error message when trying to add second port to PO.
interface Ethernet1/18
description fex 104 port 1
switchport mode fex-fabric
fex associate 104
channel-group 104
!
interface Ethernet1/26
description fex 104 port 2
switchport mode fex-fabric
fex associate 104
conf t
int e1/26
channel-group 104
command failed: port not compatible [port dynamic logical-interface scale disable]
interface port-channel104
description fex 104
switchport mode fex-fabric
fex associate 104
The above shows the configuration applied and the error message recieved when trying to add second port to PO.
The next set of commands resolved the issue.
conf t
int e1/18
shut
switchport mode access
int e1/26
shut
switchport mode access
exit
no int po 104
Reapply configuration, but using port range command.
!
int e1/18 , e1/26
switchport mode fex-fabric
fex associate 104
channel-group 104
!
show commands confirm FEX returned to service and both ports in PO
sh fex
104 FEX104-Po104 Online N2K-C2248TP-E-1GE FOX1744G5TC
show port-channel summary
104 Po104(SU) Eth NONE Eth1/18(P) Eth1/26(P)
Hopefully the above will assist and is easy to follow.
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