From: shiran guez (shiranp3@gmail.com)
Date: Mon Oct 08 2007 - 15:51:56 ART
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/ios124/124cg/
> > 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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> > 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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> person identified above. If you are not the intended recipient, or the
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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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