[j-nsp] /kernel: %KERN-6: MTU for ff02::0005 reduced to 1500

[Serge Vautour]

We have an MX960 running 10.4R7 with the same problem. What's worse is the error has been logging every 5-10min ever since we made the change ~3 months ago. JTAC case hasn't resulted in anything useful yet. It's still open.


Serge



________________________________
 From: Jonathan Lassoff <jof at thejof.com>
To: Alex D. <listensammler at gmx.de> 
Cc: Juniper-Nsp <juniper-nsp at puck.nether.net> 
Sent: Tuesday, May 8, 2012 3:14:35 PM
Subject: Re: [j-nsp] /kernel: %KERN-6: MTU for ff02::0005 reduced to 1500
 
On Tue, May 8, 2012 at 10:58 AM, Alex D. <listensammler at gmx.de> wrote:
> Hi list,
>
> i manually set IPv6 mtu to 1500 on M- an MX-Series routers running JunOS
> 10.4R8.5
> After configuration, following message appears in syslog:
> /kernel: %KERN-6: MTU for ff02::0005 reduced to 1500
>
> Is it a problem or why does the router inform about the change ?
> Whith manually set IPv4 MTU, there are no such messages in the logfile.

I would presume this is just a new codepath, and some logging was
added into the kernel.

To me, logging MTU changes on interfaces seems prudent and useful.
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