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Can anyone tell me what IntMacTx-Er means?

fline.fts
Level 1
Level 1

‎06-04-2022 02:20 PM

When I do a sh int counter errors I see this errors IntMacTx-Er.

Can please anyone correctly explain or send link to official document: what IntMacTx-Er means.

 

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7 Replies 7

MHM Cisco World
VIP
VIP

‎06-04-2022 02:30 PM

What model of sw you have?

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fline.fts
Level 1
Level 1
In response to MHM Cisco World

‎06-04-2022 02:37 PM

Nexus device. You can find output of this command here: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/interfaces/command/cisco_nexus7000_interfaces_command_ref/show_commands.html#wp3038965280

switching mode: Cut-Through

Just explain of IntMacTx-Err interesting

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Flavio Miranda
VIP
VIP

‎06-04-2022 02:35 PM

Hi

 

IntMacTx-Er -  Interface mac TX - Transmission error

IntMacRx-Er -  Interface mac RX - Reception error

 

There´s a Bug the increments this value without necessary a problem.

 

N9K-C9508-FM-E: Xmit-Err on external ports due to CRC errors on internal FM-LC link
CSCvi41964  
 
https://bst.cisco.com/bugsearch/bug/CSCvi41964 
 

r.heitmann
Level 1
Level 1
In response to Flavio Miranda

‎01-06-2025 07:58 AM

reading the but notes, i'd like to mention

a) N9K5 specific

b) not "not necessary a problem" but "contact TAC and narrow down the faulty FM which needs a reboot"

No offense, maybe Cisco edited the bug-notes in the meantime!?

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r.heitmann
Level 1
Level 1

‎01-06-2025 08:28 AM

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...

 

 

 

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r.heitmann
Level 1
Level 1
In response to r.heitmann

‎01-06-2025 08:55 AM

...show hardware internal"-stuff doesn't count any error

Action-Plan:

* watch error# - do the increase or not.

btw.

* Spanning-Tree stable, last Topology-Change months ago...

* no "SPAN (monitor session)" configured...

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ncunat5488
Level 1
Level 1
In response to r.heitmann

‎06-04-2025 01:31 AM - edited ‎06-04-2025 01:32 AM

Hi r.heitmann,

Almost same configuration for me and kind of the same errors.

2 x Nexus C9332D-GX2B in VPC (version 10.4(4)M)

2 x 100Gb interface (Official 100Gb SR4 tranceivers - one on each Nexus in the VPC) forming a LACP aggregate to a Fortigate (Fortinet official 100Gb SR4)

Interface in trunk mode with multiple VLAN 

IntMacTx-Er on the Nexus side (for the interface and the Port-channel)

And on the Fortigate side:

==== Switch Error Counters =====
rx_err :4922783
rx_crc_err :0
rx_len_err :0
rx_carrier_err :0
rx_over_err :6352441
rx_under_err :0
rx_drop_pkts :0
tx_collision_err:0
tx_drop_pkts :0

 

I have other LACP port-channel with other Nexus (N9K-C93180YC-FX3) and Netapp Device with the same kind of configuration and tranceivers and no errors on theses ports.

 

It seems to have no impact on the network traffic, we don't see any problem. But still annoying to have these errors counters increasing.

I will continue to investigate.

Regards.

Nicolas

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