You would only use a loopback for layer-3 switches that have routing enabled because you must route to and from the loopback interface.
Layer-2 switches use an SVI and default gateway for management because there is no routing on a layer-2 switch to be able to reach a loopback interface.
I use one vrf for all my customer public’s ip’s, as well as my internet boundary routes.
All in one vrf (aka mpls l3vpn)
Yes you will need mp-ibgp
Please do yourself a favor and setup a dual hub route reflector that all mp-ibgp PE’s peer with, you will be glad you did
Check out my service provider (ccnp sp) playlist. I hope to have a video soon for L3VPN ...
There are several different ways to accomplish this. Here's one way, assuming you're already running MP-BGP:
In the ISP VRF, have separate route tags for import and export, say 100 and 200 respectively. The VRF exports the default route with RT 200.
Each customer VRF imports 200, and exports its address block with RT 100.
In this way, the ISP VRF sees ...
It's right there above the diagram:
Device D and Device E are considered to be nonclients because they have explicitly configured peer relationships with each other. To make them RRroute reflector clients, remove the neighbor 192.168.5.5 statement from the configuration on Device D, and remove the neighbor 192.168.0.1 statement from the configuration on ...
To send or receive additional paths, you must follow the steps Cisco has established, and both sides agree to it:
The BGP Additional Paths feature requires the user to take three
Specify whether the device can send, receive, or send and receive additional paths. This is done at the address family level or the
neighbor level, and is ...