Advanced IP Routing
We will discuss more advanced IP routing technologies such as filtering route information to be advertised by routing protocols, adjusting metrics, and redistributing when using multiple routing protocols.
These advanced technologies allow you to create router/layer 3 switch routing tables the way you want them to be. It allows you to control the routes that IP packets are forwarded.
Overview of Cisco Route-map
A route-map is a list that summarizes the targets of a process and the contents of a process.
This section provides an overview of the route-map.
Cisco Route-map Configuration
Learn more about configuring a route-map.
The key to configure a route-map is to be clear about what you are going to use it for.
GRE Tunnel Interface - Virtual Point-to-Point Connection
The GRE (Generic Routing Encapsulation) tunnel interface is a virtual point-to-point connection between two routers that can communicate.Read more
GRE Tunnel Interface Configuration Example
This is an example of GRE tunnel interface configuration.
We configure the GRE tunnel interface in a simple network diagram and verify it with the show command.
Overview of VRF/VRF-Lite - Virtually separating the router -
VRF (Virtual Routing & Forwarding) is a technology for virtually separating the router.
This page provides an overview of VRF.Carrier Networks
Cisco VRF Configuration and Verification Commands
This article describes the configuration and verification commands for virtually partitioning one router by VRF on a Cisco router.Read more
Cisco Layer 3 VPN with VRF-Lite Configuration Example
This is an example configuration for building a Layer 3 VPN by VRF-Lite on Cisco router.Read more
What Is FVRF(Front door VRF)?
FVRF (Front door VRF) is the logical partitioning of overlay and underlay networks by VRF. This article describes the concept of FVRF.Read more
Point-to-point GRE Tunnel without FVRF
To better understand FVRF (Front door VRF), consider a network diagram that does not use FVRF.
We will build an overlay network with point-to-point GRE tunnels; we will consider the problems that can arise when VRF is not used.
Point-to-point GRE tunnel with FVRF (tunnel vrf command)
The overlay network of a point-to-point GRE tunnel is separated from the underlay network by VRF. Then, the overlay network must be associated with the underlay network.
The tunnel vrf command is the configuration command for this purpose.
IPSec VTI with FVRF
In order to use VRF-aware IPSec VTI, the configuration must properly account for IPSec communication with the VPN gateway on the underlay network (FVRF).Read more
IPSec VTI with FVRF Configuration Example
This is an example of a VRF-aware IPSec VTI configuration that uses FVRF. Please make sure you understand that "IPSec communication is performed in the FVRF (underlay network)" and configure it accordingly.Read more
DMVPN with FVRF
Consider the configuration for separating underlay and overlay networks with FVRF in DMVPN (Dynamic Multipoint VPN) Internet VPN .Read more
DMVPN with FVRF Configuration Example Part1
This is an example of VRF-aware DMVPN configuration that uses FVRF. Understand the meaning of configuring NHRP with multipoint GRE tunnels.Read more
DMVPN with FVRF Configuration Example Part2
n VRF-aware DMVPN with FVRF, a new site is to be added. Here is an example of a router configuration for a new site.
A series of configurations related to VRF-aware DMVPNs all together.