since the original documentation seems to be "incomplete" somehow...
I'll add some content to this old thread since the subject fits perfect...
I have two switches, N9K, as VPC-Pair connecting two different Servers via VPC/LACP:
A# show int e1/7,e1/23 counters errors
--------------------------------------------------------------------------------
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
--------------------------------------------------------------------------------
Eth1/7 0 0 1270786 0 0 0
Eth1/23 0 0 1270786 0 0 0
----------------------------------------------------------------------------------
Port Single-Col Multi-Col Late-Col Exces-Col Carri-Sen Runts
----------------------------------------------------------------------------------
Eth1/7 0 0 0 0 0 0
Eth1/23 0 0 0 0 0 0
----------------------------------------------------------------------------------
Port Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err
----------------------------------------------------------------------------------
Eth1/7 0 -- 0 1270786 0 0
Eth1/23 0 -- 0 1270786 0 0
----------------------------------------------------------------------------------
Port InDiscards
----------------------------------------------------------------------------------
Eth1/7 0
Eth1/23 0
--------------------------------------------------------------------------------
Port Stomped-CRC
--------------------------------------------------------------------------------
Eth1/7 0
Eth1/23 0
and
B# show int e1/7,e1/23 counters errors
--------------------------------------------------------------------------------
Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards
--------------------------------------------------------------------------------
Eth1/7 0 0 1349123 0 0 0
Eth1/23 0 0 1349123 0 0 0
----------------------------------------------------------------------------------
Port Single-Col Multi-Col Late-Col Exces-Col Carri-Sen Runts
----------------------------------------------------------------------------------
Eth1/7 0 0 0 0 0 0
Eth1/23 0 0 0 0 0 0
----------------------------------------------------------------------------------
Port Giants SQETest-Err Deferred-Tx IntMacTx-Er IntMacRx-Er Symbol-Err
----------------------------------------------------------------------------------
Eth1/7 0 -- 0 1349123 0 0
Eth1/23 0 -- 0 1349123 0 0
----------------------------------------------------------------------------------
Port InDiscards
----------------------------------------------------------------------------------
Eth1/7 0
Eth1/23 0
--------------------------------------------------------------------------------
Port Stomped-CRC
--------------------------------------------------------------------------------
Eth1/7 0
Eth1/23 0
Server 1 is connected by A.e1/7 and B.e1/7
Server 2 is connected by A.e1/23 and B.e1/23
=> no other issues at "ethernet-interface"-level like QoS-Drops etc.
=> since both switches count similar numbers
=> and both switches count local identical errors at both ports (which belong to different VPC-Port-Channels!)
version 10.3(5) Bios:version 01.09
interface Ethernet1/7
switchport mode trunk
channel-group X mode active
no shutdown
interface port-channelX
switchport mode trunk
vpc X
interface Ethernet1/23
switchport mode trunk
channel-group Y mode active
no shutdown
interface port-channelY
switchport mode trunk
vpc Y
(both ports are VLAN-Trunks with identical "allowed-vlan"-lists)
This is a "TX" = "Transmit"-Issue => but not of an independent port.
There are no "InDiscards" or "Stomped-CRC" Errors at any other port.
I'd guess:
...some kind of broadcast which the switch needs to propagate to both Ports but fails for "unknown" reason...
but there is now VLAN only active at _three_ ports [1x incoming, and both ports as outgoing] so other interfaces would would count the same amount of TX-Errors - since there are no other interfaces => we can rule out flooding.
Any idea, what could happen inside the switch, it's a non-modular N9K-C93180YC-FX3...
