[j-nsp] MX - Changing MAC address on different unit of the same interface

[Nitzan Tzelniker]

Another use case is for DPI or other transparent devices when your traffic
is not symmetrical (more downstream than upstream )
you are installing the DPI between two vrf on the same router and use
switch as port extender
This way you are using less ports on the router for almost the same amount
of traffic

btw IIRC one way to solve it is to use rvi interface as the L3 it
have different mac address then the physical port


                          +---------+
      +---------+        |         |
      |         |      +-++        |
      | Router  |      |  |        |
      |         +------|SW|     +--+-+
      |         |      |  |     |DPI |
      +---------+      +-++     +--+-+
                         |         |
                         +---------+

Nitzan




On Sat, Apr 6, 2013 at 8:10 AM, Julien Goodwin <jgoodwin at studio442.com.au>wrote:

> On 06/04/13 03:59, sthaug at nethelp.no wrote:
> > No, this is not possible (and why would you need it?). If you think
> > about this for a moment, it would require the ability to have 16k or
> > so MAC addresses per physical interface. Highly unrealistic.
>
> I can think of one common case, many IX's and shared (colo usually)
> transit lans do static mac filters, and if you need to move the port
> being able to override the mac can get you back up far quicker then
> dealing with a support tech who may not understand the problem.
>
> If that's a low-speed circuit aggregating it can make sense which can
> easily lead to a request to do per-VLAN mac's.
>
> --
> Julien Goodwin
> Studio442
> "Blue Sky Solutioneering"
>
>
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