02-11-2012 10:52 AM
We have 2 Nexus 5548's operating in VPC mode for our VMWare environment. its been working well for quite some time now.
But I noticed that just recently VPC10 is down, which is our connection back to one side of our NetApp SAN. The physical ints
are up on both sides and all appears well.
Any help would be appreciated.
-----------------------------------------------------------------------------------------
NEX1# sh vpc brief
Legend:
(*) - local vPC is down, forwarding via vPC peer-link
vPC domain id : 100
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status: success
Per-vlan consistency status : success
Type-2 consistency status : success
vPC role : primary
Number of vPCs configured : 9
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
vPC Peer-link status
---------------------------------------------------------------------
id Port Status Active vlans
-- ---- ------ --------------------------------------------------
1 Po100 up 1,220-222
vPC status
----------------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
------ ----------- ------ ----------- -------------------------- -----------
10 Po10 down* success success -
20 Po20 up success success 220
30 Po30 up success success 1,220-222
NEX1# sh vpc consistency-parameters vpc 10
Legend:
Type 1 : vPC will be suspended in case of mismatch
Name Type Local Value Peer Value
------------- ---- ---------------------- -----------------------
Shut Lan 1 No No
STP Port Type 1 Default Default
STP Port Guard 1 None None
STP MST Simulate PVST 1 Default Default
lag-id 1 [(1, 2-a0-98-11-24-9c, [(1, 2-a0-98-11-24-9c,
1, 0, 0), (7f9b, 1, 0, 0), (7f9b,
0-23-4-ee-be-64, 800a, 0-23-4-ee-be-64, 800a,
0, 0)] 0, 0)]
mode 1 active active
Speed 1 10 Gb/s 10 Gb/s
Duplex 1 full full
Port Mode 1 access access
MTU 1 1500 1500
Allowed VLANs - 220 220
Local suspended VLANs - - -
------------------------------------------------------------------------------------------------------
interface Ethernet1/3
description NETAPP_NODE_A_VIF10G-1
switchport access vlan 220
channel-group 10 mode active
------------------------------------------------------------------------------------------------------------
interface port-channel10
description NETAPP_NODE_A
vpc 10
switchport access vlan 220
-------------------------------------------------------------------------------------------------------------
sh port-channel summary
Flags: D - Down P - Up in port-channel (members)
I - Individual H - Hot-standby (LACP only)
s - Suspended r - Module-removed
S - Switched R - Routed
U - Up (port-channel)
--------------------------------------------------------------------------------
Group Port- Type Protocol Member Ports
Channel
--------------------------------------------------------------------------------
10 Po10(SD) Eth LACP Eth1/3(I)
Solved! Go to Solution.
02-11-2012 01:00 PM
From the port-channel summary I see the physical port is in "I" state. This usually means the port is not receiving LACP packets from the other side. (operationally individual). To confirm this, check with "show lacp counters interface port-channel 10" and look for sent but no receive counters incrementing every 30 seconds. If this is the case, then this means the other end of this port-channel is not correctly configured for LACP.
Regards,
steveN
02-11-2012 12:10 PM
Please add following outputs from your n5k devices:
sh log log | i 1/3
sh log log | i channel10
sh int eth 1/3
sh int po10
also please check physical connection and cable run. Such unexpected behavior very often caused by physical issues.
Regards
Alex
02-11-2012 01:00 PM
From the port-channel summary I see the physical port is in "I" state. This usually means the port is not receiving LACP packets from the other side. (operationally individual). To confirm this, check with "show lacp counters interface port-channel 10" and look for sent but no receive counters incrementing every 30 seconds. If this is the case, then this means the other end of this port-channel is not correctly configured for LACP.
Regards,
steveN
02-11-2012 01:32 PM
Hey Steven, u seem to be on the right track here..
I reset the LACP counters for po10 and po20 which are the LACP channels back to node A and node B of our SAN.
NEX1# sh lacp counters interface port-channel 10
LACPDUs Marker Marker Response LACPDUs
Port Sent Recv Sent Recv Sent Recv Pkts Err
---------------------------------------------------------------------
port-channel10
Ethernet1/3 6 0 0 0 0 0 0
and then PO 20 looks good
NEX1# sh lacp counters interface port-channel 20
LACPDUs Marker Marker Response LACPDUs
Port Sent Recv Sent Recv Sent Recv Pkts Err
---------------------------------------------------------------------
port-channel20
Ethernet1/5 2 2 0 0 0 0 0
I'll fire this off the the storage guys as I know this was working.
Thanks for your help on this..
Cheers
Dave
05-23-2012 11:25 AM
Yes lacp counters is a great command to check if LACP is working or not. However, is there a possibility one end was configured as mode active and other end as mode on?
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