Thursday, September 16, 2010

Things to remember after a 12 Day CCIE R&S bootcamp

Things to remember after 12 days of bootcamp:
  • Don't assume anything.
  • Read exactly what the question asks of you, even if it means doing it word by word.
  • Read the entire lab, twice if possible, and try to setup dependencies (eg: trunks->vtp->vlans).
  • The diagrams are always correct (eg: if it says Vlan20, it means that the IP address should be on a SVI and not the Physical interface)
  • Cut & Paste when possible.
  • Do wr often.
  • Time management is critical, set a time-frame for troubleshooting and enforce it. Getting stuck 20/30 minutes on a single 2 points task is not the way to go.
  • Make sure you are doing the configuration on the correct device, no points for applying perfect QoS on the wrong router.
  • Interface level dot1x commands don't appear if the interfaces are in dynamic mode.
  • If you are told "there is a syslog server at", be sure to check you have a route to get to
  • Clock rate is your friend.
  • Check for mappings in frame-relay. I lost points on PIM related tasks for leaving them on the router (great explanations here).
  • Check default commands disabled such as: no ip classless, no ip subnet-zero, no ip cef, no service prompt config (more). Easy way of checking most of them: sh run | i no
  • Look out for kron tasks and EEM doing nasty things like changing the enable password or killing a routing process.
  • "When doing redistribution from BGP prefixes into OSPF, you should make sure that OSPF ASBR Router-id matches originating BGP router ID."
  • Use TCL/Macros on SWs for reachability tests (more info). Example: 
    • macro name PING
      do ping
      do ping

      You can then use it on the switch:

      Switch(config}#macro global apply PING
  • Verify, verify, verify and after that verify again.

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