[c-nsp] vrf-lite routing

Mattias Gyllenvarg mattias at gyllenvarg.se
Wed Jul 17 02:28:46 EDT 2013

Hi Dan

Sounds like your getting of on the wrong foot.

The 3560 can't do much more then routing and switching. No GRE or MPLS so
you are pretty much stuck with trunking.

VRFs will only be helpfull with MPLS unless you want VRF-lite (thats VRF
that is local to one machine only). Then you still need the trunks and
You can setup the VRFs to talk fairly easily, but why have the separation
if you want them to talk?

Sound like you should just replace the old machine with the new one.

If you should do anything then setup the 3k boxes for dynamic routing so
that they simply route the traffic instead of switching it. Then you wont
have to add vlans for every new internet customer. But shaping may be
harder to do as you dont have the customers interface in your core.


On Wed, Jul 17, 2013 at 4:12 AM, Dan Letkeman <danletkeman at gmail.com> wrote:

> Hello,
> Just wondering if anyone can direct me down the correct path.   I have been
> asked by a friend to help replace an ISR2851 with a new ASR1001.   The 2851
> currently does some route-maps for different networks and a few customers
> as well as some shaping.  They want to use the ASR to peer with an ISP and
> I suggested to use tunnel's and VRF's instead of trunking vlan's through
> there network to the customers, like they are doing now.
> The network currently consists of mostly 3k switches and either fiber or
> wireless trunks to about 45 different locations.  The main goal is to
> provide internet to each of the 45 locations each having there own public
> ip/range.
> My thought was to create tunnels from the ASR to each of the locations
> (each have a 3560 switch) and then to create VRF's on each tunnel and
> assign a public IP to each VRF and then advertise those networks into the
> global BGP table.
> First time I have done anything like this...Any thoughts?
> Dan.
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*Med Vänliga Hälsningar*
*Mattias Gyllenvarg*

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