From: Scott Morris (swm@emanon.com)
Date: Sun Mar 26 2006 - 12:02:00 GMT-3
Very true, but "ip mroute" is a much quicker solution for things. Unless
you're getting a decent number of points in the multicast tasks, I would
think this would be "overengineering" and take more time than it was worth
in the lab!
But you are correct, it does work and exchange RPF information very well!
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.com
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Petr
Lapukhov
Sent: Sunday, March 26, 2006 4:58 AM
To: Alexei Monastyrnyi
Cc: Bob Sinclair; Brent Foster; david robin; Cisco certification
Subject: Re: anycast (ip multicast question)
Hello guys,
We all know that in real life people usually rely on MBGP to exchange
multicast routing information (mcast sources). That's how interdomain
multicast is usually being built: MSDP+MBGP.
AnycastRP is, after all, an intradomain multicast task. But one should
remember MBGP anyway. In some complex cases, you may look at your BGP
topology, and enable MBGP to deliver some multicast routing information
(e.g, if you are prohibited to use static mroute entries).
While this may look overcomplicated, it really worked in some of my training
scenarios :)
HTH
Petr
2006/3/26, Alexei Monastyrnyi <alexeim@orcsoftware.com>:
>
> learning by simplest example is good but following the lab wording is
> not bad either..
>
> I once lost points for very simple IBGP section just ignoring "Use
> your Loopback IP as router ID" because routers did use Loopback IPs by
> default....
>
> just my two cents to idea of *-id and whether one has to use it or not...
>
> A.
> ----- Original Message -----
> From: "Bob Sinclair" <bob@bobsinclair.net>
> To: "Brent Foster" <jbrentfoster@yahoo.com>; "david robin"
> <robindavi@gmail.com>; "Cisco certification" <ccielab@groupstudy.com>
> Sent: Saturday, March 25, 2006 10:55 PM
> Subject: Re: anycast (ip multicast question)
>
>
> > Hi Brent,
> >
> > As an instructor, I find that when people are learning a new
> > technology
> it
> > is
> > best to first present the simplest working scenario, and then build
> > on that.
> >
> > Accoring to the doc below, the originator-id is necessary under two
> > circumstances:
> >
> > 1. You have a logical RP and MSDP Mesh-groups 2. The router is a
> > dense-mode/sparse-mode border router...
> >
> > See the link below:
> >
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr
_
> > c/ipcpt3/1cfmsdp.htm#1001225
> >
> > Certainly, if you run into one of those scenarios on the lab, you
> > will want to use originator-id.
> >
> > HTH,
> >
> > Bob Sinclair
> > CCIE #10427, CCSI 30427
> > www.netmasterclass.net
> >
> > ----- Original Message -----
> > From: Brent Foster
> > To: Bob Sinclair ; david robin ; Cisco certification
> > Sent: Saturday, March 25, 2006 3:39 PM
> > Subject: Re: anycast (ip multicast question)
> >
> >
> > Bob,
> >
> > Since the goal of most folks in this forum is to attain CCIE, I
> > believe that if you did not set the originator-id you would lose
> > those points. Just my opinion.
> >
> > --Brent
> >
> > --- Bob Sinclair <bob@bobsinclair.net> wrote:
> >
> > > Brent,
> > >
> > > Perhaps you mean to say that originator id is > "desirable". I
> > can assure you > it is not required in order to do Anycast RP. How
> > > do I know this? Not from > reading the docs, but by labbing it
> > up.
> > >
> > > Bob Sinclair
> > > CCIE #10427, CCSI 30427
> > > www.netmasterclass.net
> > >
> > > ----- Original Message -----
> > > From: Brent Foster
> > > To: Bob Sinclair ; david robin ; Cisco
> > > certification
> > > Sent: Saturday, March 25, 2006 1:31 PM
> > > Subject: Re: anycast (ip multicast question)
> > >
> > >
> > > Well, originator id is required with Anycast-RP.
> > > This
> > > is because you do not want MSDP to set the source
> > > of a
> > > multicast stream to the Anycast-RP address, but
> > > rather
> > > the real RP address of the router.
> > >
> > > This is explained in the Cisco docs.
> > >
> > > --Brent
> > >
> > > --- Bob Sinclair <bob@bobsinclair.net> wrote:
> > >
> > > > Dave,
> > > >
> > > >
> > > > Anycast RP does not require BGP peering.
> > > >
> > > > Verify with
> > > >
> > > > show ip msdp peer
> > > > show ip msdp summary
> > > >
> > > > originator id is not required
> > > >
> > > >
> > > > Bob Sinclair
> > > > CCIE #10427, CCSI 30427
> > > > www.netmasterclass.net
> > > >
> > > > ----- Original Message -----
> > > > From: david robin
> > > > To: Cisco certification
> > > > Sent: Saturday, March 25, 2006 1:17 PM
> > > > Subject: anycast (ip multicast question)
> > > >
> > > >
> > > > I have a question,
> > > > we have two routers r1 and r2, the two routers
> > > has
> > > > the same loopback
> > > > address
> > > > ( loop 2) and i want to configure them for rp
> > > > anycast, this will require
> > > > msdp configuration as follow:
> > > >
> > > > r1
> > > >
> > > > ip msdp peer r2 connect-source loop 0
> > > > ip msdp originator-id loop 0
> > > >
> > > > and the same config on r2
> > > >
> > > > the question is for the anycast rp to work
> > > does
> > > > the two routers require bgp
> > > > peering between them for the msdp t or not ?
> > > >
> > > >
> > > >
> > >
> > >
> > _______________________________________________________________________
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> > > >
> > >
> > >
> > _______________________________________________________________________
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> > > >
> > >
> > >
> > > Brent Foster
> > > jbrentfoster@yahoo.com
> > >
> > > __________________________________________________
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> >
> >
> > Brent Foster
> > jbrentfoster@yahoo.com
> >
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