[c-nsp] Dual Homed Site with L2 Backup

[Richard Clayton]

Hi Hunter

The only thing that puts me off this approach is the tromboning of traffic
for the primary L2 path.  It will reduce the capacity of the CE router.
PC-Host > Customer L2 > CE L2 attachment interface > CE Tunnel, back to
Customer L3 for transit of tunnel traffic.

Thanks
Rick
Gamma.co.uk

On Sun, 23 Dec 2018 at 17:46, Hunter Fuller <hf0002 at uah.edu> wrote:

> Yes, this is what we are planning. We are landing the L2 circuit (in our
> case, it's over DWDM) on the VTEPs directly. But they also have access to
> an L3 path through the IGP. The tunnel is always in use.
>
> --
> Hunter Fuller
> Network Engineer
> VBH Annex B-5
> +1 256 824 5331
>
> Office of Information Technology
> The University of Alabama in Huntsville
> Systems and Infrastructure
>
>
> On Sun, Dec 23, 2018 at 11:03 AM Arie Vayner <arievayner at gmail.com> wrote:
>
>> One approach I can see to make it work consistently regardless what path
>> it
>> takes is to use the overlay at all times, even when the primary path is
>> up.
>>
>> Basically you just make the layer 2 link routed (i.e. terminate it with
>> layer 3 ports on both ends), and run the VXLAN one hop before (or anywhere
>> it makes sense).
>>
>> This way you just run a vxlan extension over a layer 3 redundant path.
>>
>> On Sun, Dec 23, 2018, 02:48 Richard Clayton <sledge121 at gmail.com wrote:
>>
>> > Hi Arie
>> >
>> > I did encounter the MTU requirement and configured the lab to allow for
>> > it.  VXLAN may be the future but this topology isn't really what it was
>> > intended for, due to the loop it creates (same with OTV).  I was still
>> able
>> > to ceate a working design for both protocols regardless.
>> >
>> > Would interesting to see how others would meet the requirement with this
>> > particular set of constraints.
>> >
>> > Thanks
>> > Rick
>> >
>> > gamma.co.uk
>> >
>> >
>> >
>> > On Sat, 22 Dec 2018, 20:29 Arie Vayner <arievayner at gmail.com wrote:
>> >
>> >> Vxlan is the future... 😉
>> >> Be very careful with the mtu implications.
>> >>
>> >> Tnx, Arie
>> >>
>> >> On Sat, Dec 22, 2018, 03:25 Richard Clayton <sledge121 at gmail.com
>> wrote:
>> >>
>> >>> Hi Guys
>> >>>
>> >>> Scenario
>> >>>
>> >>> Customer has dual homed geographically seperated site into mpls wan.
>> >>> They
>> >>> also have a single layer 2 circuit running between the two.  The
>> >>> requirement is to backup the layer 2 over the wan circuits.  The wan
>> >>> hardware at both sites is cisco 4k ios xe.
>> >>>
>> >>> I'm interested to know how you guys would achieve this.  I've had the
>> >>> luxury of 4 days in the lab testing VXLAN, OTV and L2TPV3 xconnect
>> >>> between
>> >>> the two 4k routers, also did JDSU throughout testing over the tunnel,
>> was
>> >>> quite interesting.
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>> >>
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>