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  1. #1
    Join Date
    Nov 2008
    Posts
    13

    Default Link State Advertisments - Types ?

    Hello Todd

    I have the 6th edition CCNA Study Guide, at the top of page 447/CH7 there is a brief description of LSAs which states "there are different types of LSA packets, and I'll go into these shortly".

    I can't see a further topic detailing specific types of LSAs in this Chapter and wondered if you could specify whether these should be included(especi ally relating to the CCNA exam).

    If so please provide a briefing

    Thankyou
    Daveh9

  2. #2
    Join Date
    Mar 2008
    Posts
    2,888

    Default LSA types

    In the CCNA you only have to be concerned about LSA types one and two, as they only wish you to know about one area in OSFP configuration.


    LSA type 1 - Router LSAs are sent from a router to other routers in the same area. It contains information regarding the routers interfaces in the same area, relevant interfaces IPs, its adjacent routers on those interfaces and sub networks.

    LSA type 2 - Network LSAs are generated by the DR on a multi access segment, and provides similar information to an LSA type 1 for the multi access segment and subnet which it belongs.

    The other LSA's are:

    LSA type 3 - Network Summary LSAs are generated by ABRs (area boder router, a router that borders two areas) and contain the subnets & costs but omit the topological data from all subnets in one area and sent to another area via the ABR.

    LSA type 4 -ASBR (autonomous system border router summary, updates passed from another routing protocol into the OSPF domain) LSAs are from ASBRs and are identical in structure to a type 3 LSA and sent when crossing an AS boundary.

    LSA type 5 -Are AS external LSAs which are originated by ASBRs and describe external networks.


    LSA type 6 - Is defined as a Group Membership LSA but not used in Cisco devices.

    LSA type 7 -NSSA (not-so-stubby area, allows the injection of external routes in a limited fashion into the stub area) External LSAs are generated by the ASBR in an NSSA area.

    LSA type 8 - Is defined as a External Attribute LSA but not used in Cisco devices.

    LSA types 9 to 11 - Defined as Opaque LSAs and are reserved for future expansion

    HTH
    Maddox Thomas-Clark 14/10/2008
    Bean Thomas-Clark 18/09/2007
    Big Evils Cisco World
    Linkedin

  3. #3
    Join Date
    Nov 2008
    Posts
    13

    Default

    Thanks for the reply Big Evil

    Regards
    Daveh9

  4. #4
    Join Date
    Dec 2006
    Posts
    2,212

    Default BE

    It's great to have you back, BE!
    Hope you stick around!!
    Todd

  5. #5
    Join Date
    Mar 2008
    Posts
    2,888

    Default

    No problems Dave. I have to write it down and put it in places i would see it everyday. I have a copy on my fridge door, my screen at my desk etc...

    I did they same when i was learing the private IP ranges. Somethings i have trouble getting to stick in my brain. LOL...

    I'll be here as much as possible TL, time permitting.
    Maddox Thomas-Clark 14/10/2008
    Bean Thomas-Clark 18/09/2007
    Big Evils Cisco World
    Linkedin

  6. #6
    Join Date
    Aug 2011
    Posts
    6

    Default

    Is this answer still relevant to the current CCNA? That we only need to know Types 1 and 2. Thanks!

  7. #7
    Join Date
    Mar 2008
    Posts
    2,888

    Default

    Quote Originally Posted by jeffsaha View Post
    Is this answer still relevant to the current CCNA? That we only need to know Types 1 and 2. Thanks!
    Pretty much - also Cisco's exam objectives states -

    Configure, verify, and troubleshoot OSPF
    At CCNA level though they do not expect a huge knowledge base on LS RP's.

    HTH.
    Maddox Thomas-Clark 14/10/2008
    Bean Thomas-Clark 18/09/2007
    Big Evils Cisco World
    Linkedin

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