CCDP Study Guide - High Availability Design - Part 2

    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.