multicast querier

nicklauscombsnicklauscombs Member Posts: 885
I have been getting different answers from different cisco books and other documents

In the querier election is it the higer or lower ip address that becomes the querier?
WIP: IPS exam

Comments

  • nicklauscombsnicklauscombs Member Posts: 885
    anyone?
    WIP: IPS exam
  • jezg76jezg76 Member Posts: 97 ■■□□□□□□□□
    My notes for the BSCI read like this:

    DR - highest IP, used in IGMPv1 to send Membership Queries
    Designated Querier - lowest IP, used in IGMPv2 to send Membership Queries
    Forwarder - highest IP if AD/metric equal, sends multicast traffic onto segment
    policy-map type inspect TACO
    class type inspect BELL
    drop log
  • mikearamamikearama Member Posts: 749
    I believe it's always HIGHEST IP.

    The Authorized Self-Study Guide BSCI by Teare and Paquet, on page 604, under IGMPv2, states:

    "When there are two IGMP routers on the same segment, the router with the highest IP address is the designated querier."

    What's the source of the information suggesting otherwise?
    There are only 10 kinds of people... those who understand binary, and those that don't.

    CCIE Studies: Written passed: Jan 21/12 Lab Prep: Hours reading: 385. Hours labbing: 110

    Taking a time-out to add the CCVP. Capitalizing on a current IPT pilot project.
  • nicklauscombsnicklauscombs Member Posts: 885
    CCIE Routing Switching Exam Guide by Odom states in IGMPV2 and V3 the router with the LOWEST ip address is elected the Querier

    and i didn't see anything in the errata for either books...

    thus the confusion begins...
    WIP: IPS exam
  • mikearamamikearama Member Posts: 749
    http://www.****.com/forum/lofiversion/index.php?t93933.html

    Looks like this topic has been confusing future-NP's for a while.

    The RFC, though, clearly states that in the case of multiple queriers, the one with the lower IP gets the role, and the other becomes a non-querier.

    http://www.faqs.org/rfcs/rfc2236.html

    Even discussed here, not that long ago:

    http://www.techexams.net/forums/viewtopic.php?p=176322

    So I'd stick with your CCIE sources... they seem to have it right.

    Mike
    There are only 10 kinds of people... those who understand binary, and those that don't.

    CCIE Studies: Written passed: Jan 21/12 Lab Prep: Hours reading: 385. Hours labbing: 110

    Taking a time-out to add the CCVP. Capitalizing on a current IPT pilot project.
  • nicklauscombsnicklauscombs Member Posts: 885
    sounds good thanks!
    WIP: IPS exam
  • ccnpninjaccnpninja Senior Member EuropeMember Posts: 1,010 ■■■□□□□□□□
    Another major difference between IGMPv1 and v2 is that there is a onestep
    way to make a certain IGMPv2 router become the Querier, and that's
    to make sure it has the lowest IP address on the shared segment.
    Taken from Chris Bryant BSCI book, for you :)
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