Tuesday, March 18, 2014

CCDP - ARCH - Command Reference

This article looks to collect together the most frequent commands associated with the CCDP ARCH exam.

The point being that these are easy marks to pick up on the exam when you get a question such as 'Name the command that allows you to [insert task here]'

This list is by no means complete and I'll add further commands as I find them.

OSPF - Originate a default route in to OSPF
    #router ospf 10
        #default-information originate [always]

OSPF - On the ABR filter out all advertised routes accept those listed in the range command
Limits the size of the DB and reduces the flooding internally
    #router ospf 1
         #area 20 range

OSPF - On the ASBR filter routes sent out externally to those explicitly listed.
    #router ospf 20
         #summary address [prefix] [mask]

OSPF - Tune the OSPF hello timer interval for faster convergence
    #interface f0/0
        #ip ospf hello-interval [seconds]

OSPF - tune SPF timers to increase efficiency
    #conf t
          #timers throttle spf [spf-start] [spf-hold] [spf-max-wait]

OSPF - Increase the reference bandwidth to factor in high speed link such as 10GB ethernet, do this across all links for consistency
    #router ospf 20
          #auto-cost reference-bandwidth 10000 (for 10Gb ethernet links)

EIGRP - Originate a default route in to EIGRP
    #conf t
         #ip default-network [network ip]

EIGRP - configure unequal-cost load balancing
    #router eigrp 1
       #variance 2

BGP -configure neighbor as a Client of the route reflector
    #router bgp 65123
        #neighboor route-reflector-client

IPv6 - enable IPv6 routing for use with RIPng, EIGRP for Ipv, OSPFv3 etc
    #conf t
         #ip v6 unicast-routing

IPv6 - Define a base prefix to use for addressing:
  #conf t
       #ipv6 general-prefix [prefix]

CEF - Eliminate CEF Polarisation where one redundant link ends up being preferred to the other
    #conf t
         #mls ip cef load-sharing

EtherChannel - Use this to ensure all links within an Etherchannel bundle are utilised effectiviely
    #conf t
        #port-channel load-balance src-dst-port

FlexLinks  - Configure a port to act as a resilient backup for FlexLinks. Configure this on the primary link.
    #interface f0/10
       #switchport backup-interface [interface id]

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