LISP for SD-Access & VxLAN | Cisco DNA

Locator/ID Separation Protocol (LISP) is routing architecture that  provides new semantics for IP addressing. The current IP routing and  addressing architecture uses a single numbering space, the IP address,  to express two pieces of information: Device identity

this covers cisco software defined access

What is Lisp Technology ?

In full list processing, LISP is a computer programming language developed about 1960 at the Massachusetts Institute of Technology by John McCarthy (MIT). LISP is based on the principle of recursive functions (in which a function appears in its own definition)

The way the device attaches to the network

with LISP for SD-Access & VxLAN.

What is VxLAN ?

Using tunnelling to extend Layer 2 connections over a Layer 3 network, VXLAN provides data centre connectivity. To enable the usage of virtual networks on top of a physical network, VXLAN is the most often used protocol in data centres.

VXLAN Overview

As its name indicates, VXLAN is designed to provide the same Ethernet Layer 2 network services as VLAN does today, but with greater extensibility and flexibility. Compared to VLAN, VXLAN offers the following benefits:

●   Flexible placement of multitenant segments throughout the data center: It provides a solution to extend Layer 2 segments over the underlying shared network infrastructure so that tenant workload can be placed across physical pods in the data center.

●   Higher scalability to address more Layer 2 segments: VLANs use a 12-bit VLAN ID to address Layer 2 segments, which results in limiting scalability of only 4094 VLANs. VXLAN uses a 24-bit segment ID known as the VXLAN network identifier (VNID), which enables up to 16 million VXLAN segments to coexist in the same administrative domain.

●   Better utilization of available network paths in the underlying infrastructure: VLAN uses the Spanning Tree Protocol for loop prevention, which ends up not using half of the network links in a network by blocking redundant paths. In contrast, VXLAN packets are transferred through the underlying network based on its Layer 3 header and can take complete advantage of Layer 3 routing, equal-cost multipath (ECMP) routing, and link aggregation protocols to use all available paths.

VXLAN Encapsulation and Packet Format

VXLAN is a Layer 2 overlay scheme over a Layer 3 network. It uses MAC Address-in-User Datagram Protocol (MAC-in-UDP) encapsulation to provide a means to extend Layer 2 segments across the data center network. VXLAN is a solution to support a flexible, large-scale multitenant environment over a shared common physical infrastructure. The transport protocol over the physical data center network is IP plus UDP.

The LISP routing architecture design separates the device identity,  or endpoint identifier (EID), from its location, or routing locator  (RLOC), into two different numbering spaces. Splitting EID and RLOC  functions yields several advantages.

Simplify Routing Operations

LISP enables enterprises and service providers to:

Simplify multi-homed routing

Facilitate scalable any-to-any WAN connectivity

Support data center virtual machine mobility

In this course you will learn and understand LISP technology , configuration & verification .

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