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

[Charles Goldsmith]

It could be, I had not found that one.  Thanks Nate!

On Thu, Apr 23, 2015 at 9:26 PM, NateCCIE <nateccie at gmail.com> wrote:
> CSCur34011?  (not for the VPN but for the network connectivity for the PC)
>
> -----Original Message-----
> From: cisco-voip [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of
> Charles Goldsmith
> Sent: Thursday, April 23, 2015 9:13 PM
> To: Jonathan Charles
> Cc: cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] Cisco 8851 not failing over to backup circuit...
>
> 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
>>
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