Subject: Re: [PATCH iproute2 v1] iproute2: show counter of carrier on<->off transitions

From: Stephen Hemminger <[email-masked]>
Date: Tue, 22 Apr 2014 15:46:16 -0700

On Wed,  2 Apr 2014 09:19:00 -0700
David Decotigny <[email-masked]> wrote:

> This patch allows to display the current counter of carrier on<->off
> transitions (IFLA_CARRIER_CHANGES, see kernel commit "expose number of
> carrier on/off changes"):
> 
>   ip -s -s link show dev eth0
>   ...
>   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 etc.
>     link/ether ............ brd ff:ff:ff:ff:ff:ff
>     RX: bytes  packets  errors  dropped overrun mcast
>     134705     758      0       0       0       0
>     RX errors: length  crc     frame   fifo    missed
>                0        0       0       0       0
>     TX: bytes  packets  errors  dropped carrier collsns
>     77374      731      0       0       0       0
>     TX errors: aborted fifo    window  heartbeat
>                0        0       0       0
>     link: carrier_changes 4
> 

I wonder if putting it under TX errors would make sense.
This is where Juniper classifies the error, and it would also
fit on same line, avoiding adding more clutter.

   2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 etc.
     link/ether ............ brd ff:ff:ff:ff:ff:ff
     RX: bytes  packets  errors  dropped overrun mcast
     134705     758      0       0       0       0
     RX errors: length  crc     frame   fifo    missed
                0        0       0       0       0
     TX: bytes  packets  errors  dropped carrier collsns
     77374      731      0       0       0       0
     TX errors: aborted fifo    window  heartbeat transition
                0        0       0       0        4

The risk is break some screen scraping script, but that doesn't
seem to be that big an issue for adding one column.

The columns also need some re-aligning here but that is different
correctness issue.