From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Sat Sep 11 2004 - 18:10:50 GMT-3
At 2:02 PM -0700 9/11/04, Bryan Osoro wrote:
>Howard,
>
>Thanks for the ideas.
>
>I have not tried the IPv6 versions of the IGMP
>commands.
>
>But to your question about the 60 seconds, not only is
>it not displayed by the "?," it gives an invalid input
>error if you put anything other than 60-300.
>
>Like I mentioned, if I play with other IGMP commands,
>I can get the router to take over after 16 seconds,
>only problem is, I can't get it to query at 10
>seconds, and take over at 16. Seems like I can do one
>or the other only....
And that may really be the case. Sometimes you can find a caveat
about recommended ratios of timers in the RFC, and other times, the
coders have put in an undocumented ratio check.
>
>I'll tool around with v6 commands to see if that makes
>a difference..
>
>b
>--- "Howard C. Berkowitz" <hcb@gettcomm.com> wrote:
>
>> At 1:40 PM -0700 9/11/04, Bryan Osoro wrote:
>> >I'm trying to do it without SNMP. Any ideas there?
>>
>> Warning: I know that the suggestion I am about to
>> make is inelegant
>> and generally insane. Given that caveat, try to find
>> the equivalent
>> command for IGMPv6, and see if it gives any better
>> control. If it
>> does, then try substituting V4 for V6 in the
>> command. It's not
>> unheard of to find that Cisco developers may derive
>> a new
>> functionality from an old command, build new
>> functionality into the
>> new one, but change the code so that the new
>> function becomes an
>> undocumented capability of the old.
>>
>> Not being in front of a router, is the 60 second
>> minimum from the
>> documentation or the ? function in context-sensitive
>> help? I've
>> found many cases where the documentation was more
>> restrictive than
>> the CLI.
>>
>> Have you tried this for all versions of IGMP? The
>> timers may be
>> different with IGMP version.
>>
>> These are all weird ideas, but I've seen examples of
>> every one of
>> them work with real code.
>>
>> >
>> >I'll dig through mib controls in parallel.
>> >
>> >
>> >
>> >thanks
>> >
>> >B
>> >--- "Howard C. Berkowitz" <hcb@gettcomm.com> wrote:
>> >
>> >> At 1:33 PM -0700 9/11/04, Bryan Osoro wrote:
>> >> >I'm trying modify IOS IGMP default behavior.
>> >> >
>> >> >Any idea how to tweak IGMP like this?
>> >> >
>> >> >Two routers on a LAN segment should query for
>> >> >membership ever 10 seconds. Additionally, if
>> one of
>> >> >the routers goes down, the other should take
>> over
>> >> >within 16 seconds.
>> >> >
>> >> >The ip igmp querier-timeout should allow you to
>> do
>> >> >this, but the minimum value you can actually
>> >> configure
>> >> >is 60 seconds.
>> >> >
>> >> >If you manipulate the ip igmp query-interval,
>> the
>> >> >querier-timeout is automatically double. So, if
>> I
>> >> >change that to 8, the querier timeout becomes
>> 16.
>> >> >However, this means that the router is querying
>> the
>> >> >LAN every 8 seconds, and not 10. Anyway to
>> change
>> >> >this behavior?
>> >> >
>> >>
>> >> Have you checked whether there is a MIB variable
>> >> available that will
>> >> give you different control than the
>> configuration
>> >> command?
>> >>
>> >>
>>
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This archive was generated by hypermail 2.1.4 : Fri Oct 01 2004 - 15:00:41 GMT-3