From: Venkataramanaiah.R (vramanaiah@gmail.com)
Date: Thu Nov 03 2005 - 03:55:53 GMT-3
Hi Scott, Do you mean to say, in some situations, ip pim nbma-mode
can be used on sparse-dense mode as well ? If so, do you think, in the
real lab exam, this will be an accepted solution.. Please clarify..
This had been lingering in my mind for quiet sometime.
Regards
-Venkat
On 11/2/05, Scott Morris <swm@emanon.com> wrote:
> Nbma mode has two pieces:
>
> 1. The paying attention individually to all join and leave requests. This
> only has a benefit to sparse mode since there are no joins or leaves in
> dense mode. If you operate in sparse-dense, you do both which means
> sometimes you'll get the benefit of this feature, sometimes you won't.
>
> 2. Normally on a serial link (with two hardware queues) the IP multicast
> messages are treated like "pseudobroadcasts" and placed in the broadcast
> hardware queue which is a strict priority queue and process switched. This
> may be great if you like your streaming stuff, but COULD mess up other
> traffic and certainly cause additional strain on your router. Nbma mode
> will reclassify ip multicast traffic into the normal queue. This benefit is
> enjoyed whether you are using sparse or dense mode.
>
> The code, however, in the router will bitch at you if you are running
> anything other than pure sparse-only stuff. IMHO this is just a hyperactive
> warning. Everything will still work as it should where it should, just the
> informational message given to you by the router causes panic.
>
> HTH,
>
> Scott
>
> PS. I wouldn't bother placing nbma mode on the spokes unless the direction
> of traffic flow is coming OUT of one of the spokes (see #2 above).
> Otherwise for incoming traffic only and not dealing with joins at all,
> putting this command on the spokes would accomplish nothing. It wouldn't
> hurt, it just wouldn't help anything.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Schulz, Dave
> Sent: Tuesday, November 01, 2005 9:20 PM
> To: Chris Lewis ; nobody@groupstudy.com; Niche
> Cc: CCIEin2006 CCIEin2006 ; ccielab@groupstudy.com
> Subject: RE: Does PIM dense mode or sparse-dense mode work over frame relay?
>
> I thought that ip pim nbma-mode is suppose to solve this problem, since it
> allows the multiple join messages over the frame. So, doesn't it work if
> you configure ip nbma and sparse at the hub along with sparse-dense mode at
> the spokes?
>
> Dave
>
> -----Original Message-----
> From: nobody@groupstudy.com
> To: Niche
> Cc: CCIEin2006 CCIEin2006; ccielab@groupstudy.com
> Sent: 11/1/2005 8:35 PM
> Subject: Re: Does PIM dense mode or sparse-dense mode work over frame
> relay?
>
> I don't have a link offhand, some time using google will probably find one
> somewhere, but I think the concept is straightforward enough to lab up and
> get some experience with. Consider this.
>
> R1---R2
> |
> |
> R3
>
> In this setup R1 is the hub, using a multipoint frame interface and all the
> directly connected interfaces are on the same subnet.
>
> Multicast will not normally be sent out the interface it was received on, so
> that is a challenge for R2 to R3 communication. So create a tunnel between
> R2 and R3 and enable ip pim dense mode on both ends. As long as you have IP
> conectivity between the addresses used to create the tunnel by the IGP, you
> should be able to get it to work.
>
> Chris
>
> Niche <jackyliu419@gmail.com> wrote:
> Hi Chris,
>
> Would you mind to provide any link to talk about this with examples?
>
> Cheers~
> Jacky
>
> On 11/2/05, Chris Lewis <chrlewiscsco@yahoo.com> wrote:A tunnel comes to
> mind
>
> CCIEin2006 CCIEin2006 <cciein2006@yahoo.com> wrote:Great, but how do you get
> dense mode (or sparse-dense mode) to work between a sender on one frame
> relay spoke and a receiver on another frame relay spoke in the same subnet?
>
> Chris Lewis <chrlewiscsco@yahoo.com> wrote: nbma-mode only makes sense for
> sparse mode, there are no joins in dense.
> The command reference is great at explaining things like this
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123tcr/1
> 23tip3r/ip3_i2gt.htm#wp1069388
>
> Chris
>
> cciein2006@yahoo.com wrote:
> Does PIM dense mode or sparse-dense mode work over frame relay? I tried the
> ip pim nbma-mode command on a multipoint frame-relay interface but it
> generates an error message saying that PIM nbma-mode is not recommended for
> dense mode or sparse-dense mode?
>
> Why is this?
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
> ---------------------------------
> Yahoo! FareChase - Search multiple travel sites in one click.
>
>
> ---------------------------------
> Yahoo! FareChase - Search multiple travel sites in one click.
>
>
> ---------------------------------
> Yahoo! FareChase - Search multiple travel sites in one click.
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
> ---------------------------------
> Yahoo! FareChase - Search multiple travel sites in one click.
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Thu Dec 01 2005 - 09:12:05 GMT-3