[cisco-voip] Cisco 8851 not failing over to backup circuit...

[Jonathan Charles]

MTU was set to 1440, we set it to Auto, no change...



Jonathan

On Thu, Apr 23, 2015 at 10:13 PM, Charles Goldsmith <wokka at justfamily.org>
wrote:

> What's your MTU over the backup VPN?  I've seen odd issues on some
> networks with different providers and MTU and fragmenting packets
> always caused issues until the MSS was set.
>
> I'm not sure why this would affect the 8851's, but we've noticed some
> other oddities with the 8851's.  For instance, computers with intel
> nic's behind the phone have issues after we apply config, and we
> narrowed it down to intel gigabit master slave mode setting on the
> driver, at least, setting that to slave instead of auto resolves the
> problem.  Otherwise, you have to reboot the phone a couple of times to
> get consistent connection through the 8851.  Phones are connected to a
> 2960 with a basic config, nothing out of the ordinary.
>
> On Thu, Apr 23, 2015 at 6:35 PM, Jonathan Charles <jonvoip at gmail.com>
> wrote:
> > We have CUCM 8.6.2 with Cisco 8851, Cisco 8831 phones at a remote
> location;
> > they are connected over MPLS and a Peplink Balance VPN as a backup.
> >
> > When we yank the MPLS, the 8831 registers with CUCM and works fine....
> the
> > 8851s do NOT.
> >
> > Any reason the 8851 would act differently?
> >
> >
> >
> >
> > Jonathan
> >
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
> >
>
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