Re: INE Video Blog - Auto-RP over NBMA Design Issues (was RE:

I've seen cases in the debug before where it shows the spoke sending the join, but neither the hub nor other spoke receiving it. I'm not sure if this difference in the point-to-point vs multipoint behavior is IOS specific, but regardless the resolution of the problem makes sense. If the interface is p2p, the RPF neighbor has to be the other end, so the join works.

Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
http://www.INE.com

On Aug 19, 2011, at 10:24 PM, "Yuri Bank" <yuribank_at_gmail.com<mailto:yuribank_at_gmail.com>> wrote:

Hey Brian,

I noticed that you initially used point-to-point sub-interfaces on the spoke routers of the frame-relay cloud, with the ospf network type set to non-broadcast. Could you explain why this fixes the issue with PIM Join messages directed towards other spoke routers (assuming the spoke router is the RP- and you have static RP mappings for the RP-Discovery address). The routing table & CEF table look to be the same when using multipoint interfaces in ospf non-broadcast mode vs point-to-point sub-interface in ospf non-broadcast mode.

Looking at this further with a packet capture I noticed that the spoke router PIM Join messages never actually get sent if the FR interface was multipoint non-broadcast, and if the RPF neighbor was another spoke router.

-Yuri
- Show quoted text -

On Thu, Aug 18, 2011 at 10:32 PM, Brian McGahan <<mailto:bmcgahan_at_ine.com>bmcgahan_at_ine.com<mailto:bmcgahan_at_ine.com>> wrote:
There was a thread regarding these design issues of Auto-RP over NBMA on the INE forums in the past couple days, so I put together a Video Blog post on the subject so you can see the problem and solution live in action. You can find the post here: <http://goo.gl/Jkx6O> http://goo.gl/Jkx6O

Specifically this video focuses on possible solutions of running Auto-RP over Frame Relay Hub-and-Spoke such as sparse-dense mode, sparse-mode with auto-rp listener, sparse-mode with a default RP placement, and PIM Join issues related to point-to-point vs multipoint interfaces and their underlying IGP protocols.

HTH,

Brian McGahan, CCIE #8593 (R&S/SP/Security)
<mailto:bmcgahan_at_INE.com>bmcgahan_at_INE.com<mailto:bmcgahan_at_INE.com>

Internetwork Expert, Inc.
<http://www.INE.com>http://www.INE.com

-----Original Message-----
From: <mailto:nobody_at_groupstudy.com> nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com> [mailto:<mailto:nobody_at_groupstudy.com>nobody_at_groupstudy.com<mailto:nobody_at_groupstudy.com>] On Behalf Of imran ali
Sent: Thursday, August 11, 2011 5:17 PM
To: Marko Milivojevic
Cc: Cisco certification
Subject: Re: MA , RP , PLACEMENTS ON FRAME-RELAY

Thnaks Marko

i document is a great resourse . and its says to place MA and RP on hub or
behind a hub.

The limitation is in place due to fact that NBMA mode works for sparse mode
groups (but as auto rp groups are dense mode flooded )

However my question was if i define a static rp for auto RP groups ,auto rp
info is now sparse mode flooded ..... NBMA mode works here ....which means
technically MA AND RP CAN BE PLACED ANY WHEARE IN THE FRAME-RELAY NETWORK ,
REGARDLESS OF ITS POSITION ? CORRECT ?

On Fri, Aug 12, 2011 at 12:18 AM, Marko Milivojevic <<mailto:markom_at_ipexpert.com>markom_at_ipexpert.com<mailto:markom_at_ipexpert.com>>wrote:

> That is correct, however, it doesn't mean the solution doesn't exist.
> It may not be straight-forward, but it exists.
>
> Cisco has a document that explains this problem:
>
> <http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/frm_rlay.html#wp1029926> http://www.cisco.com/en/US/docs/ios/solutions_docs/ip_multicast/White_papers/frm_rlay.html#wp1029926
>
> However, if the CCIE lab requires you to put MA behind a spoke, there
> is a solution - tunneling :-)
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
> FREE CCIE training: <http://bit.ly/vLecture> http://bit.ly/vLecture
>
> Mailto: <mailto:markom_at_ipexpert.com> markom_at_ipexpert.com<mailto:markom_at_ipexpert.com>
> Telephone: +1.810.326.1444<tel:%2B1.810.326.1444>
> Web: <http://www.ipexpert.com/> http://www.ipexpert.com/
>
> On Thu, Aug 11, 2011 at 13:55, imran ali <<mailto:immrccie_at_gmail.com>immrccie_at_gmail.com<mailto:immrccie_at_gmail.com>> wrote:
> > If a candidate RP or a
> >
> > Mapping Agent is placed behind the spoke node, then RP information could
> >
> > be lost. Imagine if a MA is located behind the spoke node. Then any
> Auto-RP
> >
> > discovery messages will only reach the hub node, but not the other spokes
> >
> >
> >
> >
> > i cough up with this in one of workbooks ,,,,just want to confirm ..i
> will
> > update the results on this thread .
> >
> > On Thu, Aug 11, 2011 at 11:49 PM, Marko Milivojevic <<mailto:markom_at_ipexpert.com>markom_at_ipexpert.com<mailto:markom_at_ipexpert.com>
> >
> > wrote:
> >>
> >> Before we do it - have you tried it? What problems did you run into?
> >> How did you resolve them?
> >>
> >> [ btw. - YES :-) ]
> >>
> >> --
> >> Marko Milivojevic - CCIE #18427
> >> Senior Technical Instructor - IPexpert
> >>
> >> FREE CCIE training: <http://bit.ly/vLecture> http://bit.ly/vLecture
> >>
> >> Mailto: <mailto:markom_at_ipexpert.com> markom_at_ipexpert.com<mailto:markom_at_ipexpert.com>
> >> Telephone: +1.810.326.1444<tel:%2B1.810.326.1444>
> >> Web: <http://www.ipexpert.com/> http://www.ipexpert.com/
> >>
> >> On Thu, Aug 11, 2011 at 12:48, imran ali <<mailto:immrccie_at_gmail.com>immrccie_at_gmail.com<mailto:immrccie_at_gmail.com>> wrote:
> >> > Hi experts
> >> >
> >> > i am a bit confused and tried to google but dint find any reasonable
> >> > resource on this topic
> >> >
> >> > what are valid positions of MA (mapping agent ) and RP on hub and
> spoke
> >> > network ....
> >> >
> >> > please give *me yes or no* to the following questions . this is for
> >> > auto
> >> > rp set up and imagine , sparse mode only , and static rp is assigned
> for
> >> > auto rp groups , pim nbme is enabled on hub
> >> >
> >> > 1) can a spoke becomes a RP ?
> >> >
> >> > 2)can a spoke become MA ?
> >> >
> >> > 3) can a MA be situated behind a spoke ?
> >> >
> >> > 4) can an RP be situated behind a spoke ?
> >> >
> >> > 5) can a RP Be placed behind HUB
> >> >
> >> > 6)can a MA be placed behing hub ?
> >> >
> >> >
> >> > if possible plz give justificatioin of yes and no .
> >> >
> >> >
> >> > Blogs and organic groups at <http://www.ccie.net> http://www.ccie.net
> >> >
> >> >
> _______________________________________________________________________
> >> > Subscription information may be found at:
> >> > <http://www.groupstudy.com/list/CCIELab.html> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at <http://www.ccie.net> http://www.ccie.net
Received on Sat Aug 20 2011 - 12:33:13 ART