cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
1779
Views
5
Helpful
2
Replies

Etherchannel / vPC from Nexus 5K to server is UP however the server errors: An illegal loopback occurred on adapter Check the configuration to verify that all adapters are connected to 802.3ad compliant switch ports

sgonsalv
Level 1
Level 1

Hi Guys,

We have farily stock standard config across our 5Ks as follows however while the port-channel / vPC is UP the server side complains with the following error continiously:

dc-224-dh3-rke17-sas1

interface port-channel644
switchport mode trunk
switchport trunk allowed vlan 100-101,948-949
speed 10000
vpc 644

interface Ethernet2/3
description RCCOMDC3-066-T2
switchport mode trunk
switchport trunk allowed vlan 100-101,948-949
channel-group 644 mode active

dc-224-dh3-rke18-sas1

interface port-channel644
switchport mode trunk
switchport trunk allowed vlan 100-101,948-949
speed 10000
vpc 644

interface Ethernet2/3

description RCCOMDC3-066-T1
switchport mode trunk
switchport trunk allowed vlan 100-101,948-949
channel-group 644 mode active

dc-224-dh3-rke17-sas1# sh vpc 644


vPC status
----------------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
------ ----------- ------ ----------- -------------------------- -----------
644 Po644 up success success 100-101,948
-949

dc-224-dh3-rke18-sas1# sh vpc 644


vPC status
----------------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
------ ----------- ------ ----------- -------------------------- -----------
644 Po644 up success success 100-101,948
-949

dc-224-dh3-rke17-sas1# sh port-channel summary

<snip>

644   Po644(SD)   Eth      LACP      Eth2/3(P)

dc-224-dh3-rke18-sas1# sh port-channel summary

<snip>

644   Po644(SD)   Eth      LACP      Eth2/3(P)

The server itself is:

root@rccomdc3-066:~# modinfo i40e
filename:       /lib/modules/3.19.0-39-generic/kernel/drivers/net/ethernet/intel/i40e/i40e.ko
version:        1.3.47
license:        GPL
description:    Intel(R) Ethernet Connection XL710 Network Driver
author:         Intel Corporation, <e1000-devel@lists.sourceforge.net>
srcversion:     442A8B9F69471758CEE3988
alias:          pci:v00008086d00001588sv*sd*bc*sc*i*
alias:          pci:v00008086d00001587sv*sd*bc*sc*i*
alias:          pci:v00008086d00001589sv*sd*bc*sc*i*
alias:          pci:v00008086d00001586sv*sd*bc*sc*i*
alias:          pci:v00008086d00001585sv*sd*bc*sc*i*
alias:          pci:v00008086d00001584sv*sd*bc*sc*i*
alias:          pci:v00008086d00001583sv*sd*bc*sc*i*
alias:          pci:v00008086d00001581sv*sd*bc*sc*i*
alias:          pci:v00008086d00001580sv*sd*bc*sc*i*
alias:          pci:v00008086d0000157Fsv*sd*bc*sc*i*
alias:          pci:v00008086d00001574sv*sd*bc*sc*i*
alias:          pci:v00008086d00001572sv*sd*bc*sc*i*
depends:        configfs,ptp,vxlan
vermagic:       3.19.0-39-generic SMP mod_unload modversions
parm:           debug:Debug level (0=none,...,16=all) (int)

root@rccomdc3-066:~# modinfo i40e
filename:       /lib/modules/3.19.0-39-generic/kernel/drivers/net/ethernet/intel/i40e/i40e.ko
version:        1.3.47
license:        GPL
description:    Intel(R) Ethernet Connection XL710 Network Driver
author:         Intel Corporation, <e1000-devel@lists.sourceforge.net>
srcversion:     442A8B9F69471758CEE3988
alias:          pci:v00008086d00001588sv*sd*bc*sc*i*
alias:          pci:v00008086d00001587sv*sd*bc*sc*i*
alias:          pci:v00008086d00001589sv*sd*bc*sc*i*
alias:          pci:v00008086d00001586sv*sd*bc*sc*i*
alias:          pci:v00008086d00001585sv*sd*bc*sc*i*
alias:          pci:v00008086d00001584sv*sd*bc*sc*i*
alias:          pci:v00008086d00001583sv*sd*bc*sc*i*
alias:          pci:v00008086d00001581sv*sd*bc*sc*i*
alias:          pci:v00008086d00001580sv*sd*bc*sc*i*
alias:          pci:v00008086d0000157Fsv*sd*bc*sc*i*
alias:          pci:v00008086d00001574sv*sd*bc*sc*i*
alias:          pci:v00008086d00001572sv*sd*bc*sc*i*
depends:        configfs,ptp,vxlan
vermagic:       3.19.0-39-generic SMP mod_unload modversions
parm:           debug:Debug level (0=none,...,16=all) (int)
root@rccomdc3-066:~# uname -a
Linux rccomdc3-066 3.19.0-39-generic #44~14.04.1-Ubuntu SMP Wed Dec 2 10:00:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@rccomdc3-066:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.3 LTS"
root@rccomdc3-066:~# cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)

Bonding Mode: IEEE 802.3ad Dynamic link aggregation
Transmit Hash Policy: layer3+4 (1)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

802.3ad info
LACP rate: fast
Min links: 0
Aggregator selection policy (ad_select): stable
Active Aggregator Info:
Aggregator ID: 1
Number of ports: 2
Actor Key: 13
Partner Key: 33412
Partner Mac Address: 00:23:04:ee:be:33

Slave Interface: em1
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 0
Permanent HW addr: f8:bc:12:08:c4:40
Aggregator ID: 1
Slave queue ID: 0

Slave Interface: em2
MII Status: up
Speed: 10000 Mbps
Duplex: full
Link Failure Count: 1
Permanent HW addr: f8:bc:12:08:c4:42
Aggregator ID: 1
Slave queue ID: 0

We've updated the kernel and the driver on the said server to no avial.  I've also removed and re-applied the configuration on the N5K side - wondering if anyone has run into this sort of issue before and has a fix? From the switch side there doesn't seem to be any additional configuration i require; (correct me if i'm wrong).  Any assistance would be appreciated.

thanks

Sheldon

2 Replies 2

Kirk J
Cisco Employee
Cisco Employee

Greetings.

I believe a had a similar case before with RHEL 6.5 and there was a RedHat KB that mentioned making sure the 'channel-group xyz mode active' was actually applied at the Port-channel Int itself and not just the members interfaces alone.

Thanks,

Kirk..

You can't apply the 'channel-group xyz mode active' at the Port-channel interface. 

Review Cisco Networking for a $25 gift card