From: shiran guez (shiranp3@gmail.com)
Date: Tue Oct 09 2007 - 02:55:19 ART
No, please look into the documentation:
*"In bidirectional mode, traffic is routed only along a bidirectional shared
tree that is rooted at the rendezvous point (RP) for the group".* mean
bidirectional is running in sparse mode already, mean there is no
bidirectional in other mode then sparse as it relay on the RP.
On 10/8/07, Jay.Hanke@alltel.com <Jay.Hanke@alltel.com> wrote:
>
> I think our wires are crossed. I'm talking about bidirectional vs sparse
> not sparse vs dense. The example on the website said it was to put some
> groups in bidirectional and some groups in sparse.
>
> I mocked up the example and sure enough if you put the bidir keyword on
> the rp config the group is bidirectional rather than sparse. If you take
> it off the group is in sparse mode.
>
> You're not wrong, just answering a different question.
>
> jay
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> shiran guez
> Sent: Monday, October 08, 2007 1:52 PM
> To: Hanke, Jay
> Cc: ccielab@groupstudy.com
> Subject: Re: Bidir-PIM: Example
>
> again bidirectional dose not mean dual mode (dense, sparse).
>
> bidirectional is like the path vector of the multicast like BGP in
> relation to IGP.
> its job is to give a better design when you are in a large scale sparse
> mode domain.
>
> as for your question how can the router know what group is sparse and
> what is dense well it is very simple, if you have a RP for that group
> then the group is sparse if you don't then it is dense.
>
> there are 2 groups that are dense by default 224.0.1.40 and 224.0.1.39.
> other then that if you set a group with RP then it is sparse if you
> don't it is dense.
>
> please if some one think I am wrong here, join to the discussion but I
> am 99% sure I am not wrong.
>
> On 10/8/07, Jay.Hanke@alltel.com <Jay.Hanke@alltel.com> wrote:
> >
> > It must be a mistake in the docs. I mocked it up on the routers and
> > the groups. If both RPs are set to bidirectional all the groups go
> > into bidirectional. If one RP has the bidirectional argument only the
> > groups associated with that RP are bidirectional which makes a lot
> more sense.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of shiran guez
> > Sent: Monday, October 08, 2007 11:38 AM
> > To: Hanke, Jay
> > Cc: ccielab@groupstudy.com
> > Subject: Re: Bidir-PIM: Example
> >
> > bidirectional dose not mean it will be sparse or dense mode.
> >
> > if you want sparse or dense then you need simply to do ip pim
> > sparse-dense mode this command under the interface will insure you
> > will work spars and if there is no RP or you lost the connection to
> > the RP then you will work dense.
> >
> > the bidirectional is as I said before only for sparse mode. Bidir-PIM
> > is designed to be used for many-to-many applications within individual
>
> > PIM domains
> >
> >
> > On 10/8/07, Jay.Hanke@alltel.com <Jay.Hanke@alltel.com> wrote:
> > >
> > > If I understand correctly groups not matching the RP group access
> > > left
> >
> > > will fail back to dense-mode unless otherwise allowed.
> > >
> > > The example is supposed to have an RP that can support 3 blocks of
> > > groups
> > >
> > > 224/8 and 227/8 as bidirectional
> > > 226/8 as only sparse mode only
> > >
> > > If you configure sparse mode only, you issue the same command
> > > without the bidirectional. So if I wanted 224/8 and 227/8 to be
> > > bidirectional (and 226/8 as sparse only), wouldn't the config for
> > > the RP be as follows?
> > >
> > > Ip multicast-routing
> > > !
> > > Ip pim bidir-enable
> > > !
> > > ip pim rp-address 10.0.1.1 45 bidir
> > > ip pim rp-address 10.0.2.1 46
> > > !
> > > access-list 45 permit 224.0.0.0 0.255.255.255 access-list 45 permit
> > > 227.0.0.0 0.255.255.255 access-list 46 permit 226.0.0.0
> > > 0.255.255.255
> > >
> > >
> > > If the example from Cisco is correct, how does ios know which ones
> > > are
> >
> > > sparse mode and which ones are bidirectional?
> > >
> > > Thanks,
> > >
> > > jay
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>
> > > Of shiran guez
> > > Sent: Monday, October 08, 2007 10:24 AM
> > > To: Hanke, Jay
> > > Cc: ccielab@groupstudy.com
> > > Subject: Re: Bidir-PIM: Example
> > >
> > > I don't understand why you expect it to be stripped off?
> > > the bidirectional is configured together with sparse mode, the
> > > bidirectional job is like to be the master of a sparse mode domain
> > > to control several RP's by adding a designated forwarder (DF)
> > >
> > > http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124c
> > > g/
> > > hi
> > > mc_c/chap05/mcbbasic.htm#wp1080866
> > >
> > >
> > > On 10/8/07, Jay.Hanke@alltel.com <Jay.Hanke@alltel.com> wrote:
> > > >
> > > > Agreed, but my question is regarding running two RP's on the same
>
> > > > router, one for Bidirectional and one for Sparse mode. Otherwise,
> > > > how would the routers know to allow upstream traffic for a
> > > > particular
> > > group?
> > > >
> > > > ------------------------------
> > > > *From:* shiran guez [mailto:shiranp3@gmail.com]
> > > > *Sent:* Monday, October 08, 2007 12:21 AM
> > > > *To:* Hanke, Jay
> > > > *Cc:* ccielab@groupstudy.com
> > > > *Subject:* Re: Bidir-PIM: Example
> > > >
> > > >
> > > > no, when you set a static RP address you must set it on all the
> > > > Multicast Routers inclde the RP himself.
> > > >
> > > >
> > > >
> > > >
> > > > On 10/7/07, Jay.Hanke@alltel.com <Jay.Hanke@alltel.com> wrote:
> > > > >
> > > > > In the bidir-pim example on this page:
> > > > >
> > > > >
> > > > > http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/
> > > > > 12
> > > > > 4c
> > > > > g/himc_c/
> > > > > chap05/mcbbasic.htm#wp1134906
> > > > >
> > > > > The following example is cited with the description saying that
> > > > > group
> > > > > 226/8
> > > > > will be in sparse mode rather than bidirectional mode.
> > > > >
> > > > > !Enable IP multicast routing
> > > > > ip multicast-routing
> > > > > !Enable bidir-PIM
> > > > > ip pim bidir-enable
> > > > > interface loopback 0
> > > > > description One Loopback address for this routers Bidir Mode RP
> > > > > function ip address 10.0.1.1 255.255.255.0 !
> > > > > interface loopback 1
> > > > > description One Loopback address for this routers Sparse Mode RP
>
> > > > > function ip address 10.0.2.1 255.255.255.0
> > > > >
> > > > > ip pim rp-address 10.0.1.1 45 bidir ip pim rp-address 10.0.2.1
> > > > > 46 bidir
> > > > >
> > > > > access-list 45 permit 224.0.0.0 0.255.255.255 access-list 45
> > > > > permit 227.0.0.0 0.255.255.255 access-list 46 permit 226.0.0.0
> > > > > 0.255.255.255
> > > > >
> > > > > Shouldn't the ip pim rp-address 10.0.2.1 46 bidir command have
> > > > > the
> >
> > > > > bidir stripped off?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > jay
> > > > >
> > > > >
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> > Shiran Guez
> > MCSE CCNP NCE1
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> Shiran Guez
> MCSE CCNP NCE1
> http://cciep3.blogspot.com
> http://www.linkedin.com/in/cciep3
>
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> The information contained in this message, including attachments, may
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> responsible for delivering this message to the intended recipient, Alltel
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-- Shiran Guez MCSE CCNP NCE1 http://cciep3.blogspot.com http://www.linkedin.com/in/cciep3
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