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CCDP Study Guide - High Availability Design - Part 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




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)





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




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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