Situatie

OTV is a Cisco technology that extends Layer 2 networks over a Layer 3 IP network, allowing multiple data centers to appear as if they are on the same LAN even when geographically distant.

How does it work?

1. OTV devices (usually Cisco Nexus switches) connect to the local Layer 2 network

2. They create a virtual interface called an Overlay that carries Layer 2 frames encapsulated in IP packets (MAC-in-IP)

3. The packets travel over the Layer 3 IP network between sites

4. At the destination, packets are decapsulated and delivered to the local Layer 2 network.

Advantages:

• Does not require multicast support in the IP network.

• Avoids Layer 2 loops.

• Supports VM mobility and disaster recovery.

Basic Cisco Nexus configuration example:

Simple Tutorial on VPLS (Virtual Private LAN Service)

What is VPLS?

VPLS is an MPLS technology that allows extending an Ethernet Layer 2 network between multiple sites over a provider’s MPLS network, so all sites behave like a single LAN.

How does it work?

1. The customer has CE routers at each site

2. CE routers connect to the provider’s PE routers

3. The MPLS provider creates Layer 2 tunnels between PE routers

4. Ethernet traffic is carried across sites as if on the same LAN.

Advantages:

• Scalable and secure

• Connects multiple sites into one bridged network

• Uses MPLS for performance and control.

Basic Cisco IOS configuration example:

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