currently we have one ISP and our interVLAN routing between internal networks is done by the core switch. In the future we plan on obtaining a second WAN connection which is to be used exclusively for voice traffic. Every other type of traffic should use the other WAN connection.
Can this be achieved with PBF? If so, what is best practice for the implementation, a VR for each ISP?
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You only need one VR. And then depending on your setup you can use one or more simple static routes (in case your voice traffic needs to go to an external provider where you know the IP addresses) or a PBF rule where you specify the voice ports that need to be sent out of the second ISP connection.
To add on to the answer that @vsys_remo already gave; if your network map is an accurate depection of your network design, this will actually be a really straight-forward afair. You already have your Voice network segmented out from your regular users, so simply specifying a new route for your phones will likely be the answer here.
If you need any additional help when you actually get the new connection just make a new post or update this one, but keep things simple. As @vsys_remo already mentioned you don't need a new VR in this situation and simply updating the routes is going to be a simpler change than setting up PBF for something that doesn't require it.
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