Re: mcast tshoot tips?

On both attempts I had mcast stuff, if you solid understand the tickets narbik made on his tshoot wb with Dan, you will find the ts section easier (personal experience). I remember doing his ts wb and remember spending more than one hour to fix something he made up, once I attempted the lab there were no crazy ninja tickets, just straightforward stuff.

Cheers,

On 01/05/2011, at 23:27, ALL From_NJ <all.from.nj_at_gmail.com> wrote:

> Wowsers!!! A nice link and some good info.
>
> Dave, I forgot about the 'active' keyword at the end of the mroute command
> ... that sure is helpful and I used to use that command a lot when I used to
> work with mcast on my job ...
>
> From Jason:
>
> http://blog.ine.com/2010/09/17/troubleshooting-multicast-routing/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ine+%28INE+CCIE+Blog%29
>
> Some good reading this will be.
>
> Thank you team. I will have some more playtime tomorrow ... it is past my
> bedtime now ;-)
>
> Chat soon and thanks again!!!
>
>
>
>
> On Sun, May 1, 2011 at 10:58 PM, Jason Witover <jwitover_at_itproserv.com>wrote:
>
>> I find this a helpful link:
>>
>> http://blog.ine.com/2010/09/17/troubleshooting-multicast-routing/?utm_sourc
>> e=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ine+%28INE+CCIE+Blog%29<http://blog.ine.com/2010/09/17/troubleshooting-multicast-routing/?utm_sourc%0Ae=feedburner&utm_medium=feed&utm_campaign=Feed%3A+ine+%28INE+CCIE+Blog%29>
>>
>>
>>
>> On 5/1/11 9:17 PM, "ALL From_NJ" <all.from.nj_at_gmail.com> wrote:
>>
>>> Hey team,
>>>
>>> Was doing some mcast tshooting today, and wanted to get some ideas or
>>> links
>>> that you think will be helpful for the lab and tshoot section. I am
>>> worried
>>> about the amount of time, and complexity of this ... especially since in
>>> the
>>> config section of the lab, this mcast technology will 'sit on top of' the
>>> other technologies I have already configured; IGPs, etc ...
>>>
>>> On the RP:
>>> Whenever you add a source or destination, it should show up in the mroute
>>> table. So in this way, you can tshoot either the source or group
>>> membership
>>> problems. Which direction has the problem; from the source or from the
>>> join-group? For those who want to lab this, try it since it is a quick
>>> lab
>>> test. Add a source or join-group, and then check the RP's table. It is
>>> quite cool to see this show up in the mroute table.
>>>
>>> Team question - what is the fastest way to tell if you have a RPF failure?
>>> I can imagine being in the lab and getting confused with topology and
>>> direction of routes.
>>>
>>> What is the quickest way to resolve a RPF failure? My thoughts below,
>>> please add to this:
>>>
>>> 1) Static mroute (How many routers could potentially need these static
>>> mroutes?)
>>> 2) Admin distance, cost, etc ... or other tweaks to prefer a path without
>>> removing the routes? Trying to maintain the reachability, which making
>>> the
>>> mcast route also the best IGP route ...
>>> 3) Any preferred debugs that might tell you what to configure to solve the
>>> RPF failure?
>>>
>>> Suggestion for problem resolution: start a long ping process from the
>>> source, and as you are resolving the problem, when you fixed the problem,
>>> the ping will start to work. Is this a good method, anyone else try this?
>>>
>>> From Narbik - add loopbacks with the igmp join-group. Do this along the
>>> path, and where the ping stops, there is the problem router. Any
>>> additional
>>> suggestions to this? Sounds like a good idea.
>>>
>>> Likely potential problems IMO ...
>>>
>>> 1) PIM or ip multicast-routing not enabled
>>> 2) RP not reachable?
>>> 3) RPF failure
>>> 4) ACL or firewall? Should this also affect the RP not being reached?
>>> Meaning ... can I skip this check if the RP is reachable and the PIM
>>> messaging is working
>>> 5) RP not learning sources or join-groups
>>> 6) ???
>>>
>>> Team - I am worried about the time I have to resolve tshooting; caused by
>>> me
>>> or the tshoot section. I look forward to hearing your thoughts on this
>>> matter.
>>>
>>> TIA team and please accept my wishes for you to have a great week!!!
>>>
>>> --
>>> Andrew Lee Lissitz
>>> all.from.nj_at_gmail.com
>>>
>>>
>>> Blogs and organic groups at http://www.ccie.net
>>>
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>
>
> --
> Andrew Lee Lissitz
> all.from.nj_at_gmail.com
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Mon May 02 2011 - 02:23:02 ART