Re: OT: Layer 2 over Layer 3 for SPAN (Voice Recording)

Same thing came into my mind becasue if you will go for more solutions then
you will further complicate the things.

2009/11/1 Carlos G Mendioroz <tron_at_huapi.ba.ar>

> Ouch!
> This is the kind of thing you never forget in the next design, I guess.
>
> Just an idea that popped in my mind: what about keeping L2 just for
> an RSPAN vlan ?
> I.e., make your DA (distribution access) links L2 trunks, have your L3
> traffic into a dedicated vlan (SVIs) and create the RSPAN vlan.
>
> Appart from the RSPAN, all vlans would be point to point, so no need for
> spanning tree in them.
> It's not going to be clean configuration wise, but I think is the
> cheapest way to separate the SPAN traffic and do so in hardware.
>
> -Carlos
>
> Saud Malik @ 1/11/2009 7:15 -0300 dixit:
> > Hi Experts,
> >
> > I am facing a scenario where i deployed Campus network with Routed Access
> > Layer (EIGRP) using 6503s on Distribution Layer and 3750s at Access
> Layer.
> > I configured Point-to-point IPs between the distribution and Access
> layer.
> >
> > Now when i deployed the whole solution, customer is facing issue
> configuring
> > RSPAN for voice recording. RSPAN session cannot cross any Layer 3 boundry
> as
> > RSPAN is a LAN (Layer 2) feature. In order to monitor traffic across
> > different networks, we may use Encapsulated Remote SwitchPort Analyser
> > (ERSPAN). But ERSPAN is only supported on 6500s.
> >
> > I am looking for a best solution to SPAN vlan across Layer3 boundries. I
> > found some solutions like EoL2TPv3, Fancier Ethernet-Over Techniques
> (VPLS,
> > EoMPLSoGRE, etc.)
> > Bridge over GRE (not supported anymore, assuming it ever was really
> > supported) which i believe are not optimal solutions for this kind of
> > scenario. I would like to get feedback if someone faced the same
> scenario
> > and what was the best solution to overcome it.
> >
> > Your feedback is highly appriciated
> >
> > thanks.
> >
> > Saud
> >
> >
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>
> --
> Carlos G Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
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Muhammad Nasim
Network Engineer
Saudi Arabia
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