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CCDP Study Guide - High Availability Design - Part 2

VERSION 2 
Created on: Jan 8, 2013 4:38 PM by Klaus Engelmann - Last Modified:  Jan 8, 2013 5:09 PM by Klaus Engelmann

High Availability Design - Part 2

 

Access Layer High Availability

 

Within hardware

redundant power supplies

redundant supervisor engines

 

Between hardware

default gateway redundancy between multiple distribution layer

first hop redundancy protocols

 

Stackwise Technology

 

hardware

 

3750 Workgroup switch

etherswitch services module

 

connect switches using special cables to form a single logical unit

 

single management interface

 

the special cable used create a bidirectional path that act as a the fabric switch

 

 

IOS 12.2(18) SXD for 6500/7600 Switches

 

Control Plane Policing (CoPP)

 

Nonstop Forwarding (NSF)

 

Stateful Switchover (SSO)

 

Gateway Load Balancing Protocol (GLBP)

 

 

GLBP vs HSRP

 

it is very easy to have load balancing using GLBP

 

load balancing using HSRP is not so easy and it can lead to errors and problems

 

Core and Distribution Layer Design

 

redundancy within and between layers

 

it is necessary to have network bandwidth and port density capacity planning

 

 

Optimal Redundancy

 

OSPF and EIGRP timer manipulation after carefully evaluation

 

redundant supervisor engines with NSF and SSO may conflict with modified IGP timers

 

NSF and SSO most commonly deployed at the network edge for use with peer-to-peer links to providers

 

NSF with SSO

 

fast supervisor switchover

 

new route processor takes over when there is a failure

 

synchronizes: arp, QoS, ACLs, FIB, startup config, running config

 

 

NSF - Non Stop Forwarding

 

continue packet forwarding (EIGRP, OSPF, IS-IS, BGP)

 

 

Nexus Line - Cisco Equipment

 

extremely modular

 

processes are also modular

 

 

6500 Series Multilayer Switch with IOS Software Modularity

 

resilent control plane

 

fault containment and stateful process

 

modularity

 

cisco IOS-XR (high availability IOS) is based on UNIX QNX

 

uses EEM - Embedded event manager

 

 

Spanning Tree Protocol

 

STP is needed because there are some designs that look for it:

 

VLAN spans access layer switches for business applications support

 

protect against user-side loops

 

datacenter applications on a server farm

 

 

 

This Study Guide is based on the book "Designing Cisco Network Service Architectures" written by John Tiso and published by Cisco Press.

It is a personal group of notes and topics created with the intention of helping my studies for the Cisco CCDP Certification.

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