multicast querier
nicklauscombs
Member Posts: 885
in CCNP
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?
In the querier election is it the higer or lower ip address that becomes the querier?
WIP: IPS exam
Comments
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jezg76
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 segmentpolicy-map type inspect TACO
class type inspect BELL
drop log -
mikearama
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. -
nicklauscombs
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 -
mikearama
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.
MikeThere 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. -
ccnpninja
Member Posts: 1,010 ■■■□□□□□□□
Taken from Chris Bryant BSCI book, for youAnother 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.
my blog:https://keyboardbanger.com
