From: Private Ryan (pv.ryan@gmail.com)
Date: Fri Sep 23 2005 - 22:02:30 GMT-3
It is because I don't know the meaning of querier. just know what is DR. =_="
Thus
"ip igmp query-timeout" is the time parameter between routers in the same subnet
"ip igmp query-max-response-time" is time parameter between routers
and multicast client.
In here, if "ip igmp join-group <multicast-source>" is run on (e0)R2,
I should run
"ip igmp query-max-response-time" in R1(e1), right ?
mutlicast source--> (e0)R1(e1)-----(e0)R2
Thanks for your response !
Ryan
2005/9/24, simon hart <simon@harttel.com>:
> The commands are pretty different,
>
> ip igmp query-timeout
>
> When you have more than one router on a subnet configured for multicast,
> then one router will need to establish who will be sending General Queries
> and Group Specific Queries. The router with highest IP address will be the
> querier.
>
> However any other attached multicast router will be listening to the queries
> on the subnet. If it fails to hear any queries after a specified amount of
> time it will take on the responsibility of being the querier for the subnet.
> This time can be changed by the command ip igmp query-timeout
>
> ip igmp query-max-response-time
>
> The router will periodically send out an igmp query - default 60 seconds.
> Once a query is sent out on the subnet, any hosts that wish to join an mcast
> group, or wish to continue receiving an mcast group will respond with a
> membership report.
> Now if a router is forwarding to an mcast group on the subnet due to a
> previous join, it will as stated above send out a query every 60 seconds.
> If it hears no response from any hosts that wish to continue to recieve this
> mcast group, then the router will delete the group and stop forwarding the
> traffic. The time before it takes this action is the:
> ip igmp query-max-response-time
>
> HTH
>
> Simon
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Private Ryan
> Sent: 23 September 2005 20:19
> To: Cisco certification
> Subject: Command meaning on "ip igmp"
>
>
> Can any explain the difference between the following?
> - ip igmp query-max-response-time
> - ip igmp query-timeout
>
> I checked the CCO but I don't understand "it takes over as the
> querier" for "ip igmp query-timeout". Sorry for my poor knowledge on
> Multicast.
>
>
>
> Ryan
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
> --
> No virus found in this incoming message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.11.5/110 - Release Date: 22/09/2005
>
> --
> No virus found in this outgoing message.
> Checked by AVG Anti-Virus.
> Version: 7.0.344 / Virus Database: 267.11.5/110 - Release Date: 22/09/2005
This archive was generated by hypermail 2.1.4 : Sun Oct 02 2005 - 14:40:16 GMT-3