Re: Well Known Multicast Addresses

From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Mar 13 2009 - 17:43:53 ARST

hahahaha

Hi Master Bob,

The grasshopper Narbik was kinda agreeing with you on the Neighbor command.
He was NOT guessing, sorry it did not come across that way. But i guess the
Master was guessing.

On Fri, Mar 13, 2009 at 10:03 AM, Bob Sinclair <bob@bobsinclair.net> wrote:

> Hi Narbik,
>
> Do you mean the TTL for RIP and EIGRP is only 2 when the neighbor command
> is
> used? Not what I see when I capture these packets. The TTL is 2 whether
> RIP version 1, version 2, broadcast, multicast or unicast. Same with
> EIGRP,
> whether there is a neighbor statement or not.
>
> You know better than to guess!
>
> HTH,
>
> -Bob
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Narbik Kocharians
> > Sent: Friday, March 13, 2009 12:06 PM
> > To: Bob Sinclair
> > Cc: Dale Shaw; Nick; Cisco certification
> > Subject: Re: Well Known Multicast Addresses
> >
> > When it comes to RIP or Eigrp and TTL i guess the neighbor command
> > takes
> > care of the TTL.
> >
> > On Fri, Mar 13, 2009 at 8:37 AM, Bob Sinclair <bob@bobsinclair.net>
> > wrote:
> >
> > > Hi All,
> > >
> > > It seems that the addresses in the 224.0.0.0/24 range are kept from
> > > leaking
> > > to other links by the address range itself, not by the TTL. Cisco
> > > implements
> > > both RIP and EIGRP with starting TTL of 2, yet these packets will not
> > be
> > > forwarded off the link if the they are destined to 224.0.0.9, or
> > > 224.0.0.10.
> > > To get this protocol traffic to cross to another link (or PVC) we
> > need to
> > > change the destination to unicast, using neighbor statements.
> > >
> > > HTH,
> > >
> > > Bob Sinclair CCIE 10427 CCSI 30427
> > > www.netmasterclass.net
> > >
> > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > > > Dale Shaw
> > > > Sent: Thursday, March 12, 2009 11:58 PM
> > > > To: Nick
> > > > Cc: Cisco certification
> > > > Subject: Re: Well Known Multicast Addresses
> > > >
> > > > Hi Nick,
> > > >
> > > > As Daniel has already pointed out, the third octet for those groups
> > is
> > > > 1, not 0.
> > > >
> > > > 224.0.0.0/24 is reserved for local subnetwork control -- things
> > like
> > > > OSPF, EIGRP, RIPv2, and all that.
> > > >
> > > > I'm not sure how it's enforced, but theoretically everything using
> > > > 224.0.0.0/24 should use a TTL of 1 -- you should never seen
> > > > 224.0.0.0/24 groups leaking beyond the local link.
> > > >
> > > > cheers,
> > > > Dale
> > > >
> > > > On Fri, Mar 13, 2009 at 12:32 PM, Nick <ccieaz@googlemail.com>
> > wrote:
> > > > > Hi All,
> > > > >
> > > > > I was making a quick list of well known multicast addresses and
> > was
> > > > confused
> > > > > about these two, are 224.0.0.39 and 224.0.0.40 used for anything
> > > > major ?
> > > > >
> > > > > Thanks
> > > > > Nick
> > > >
> > > >
> > > > Blogs and organic groups at http://www.ccie.net
> > > >
> > > >
> > _______________________________________________________________________
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> > >
> > >
> > _______________________________________________________________________
> > > Subscription information may be found at:
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> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> > --
> > Narbik Kocharians
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> > www.MicronicsTraining.com <http://www.micronicstraining.com/>
> > www.Net-Workbooks.com <http://www.net-workbooks.com/>
> > Sr. Technical Instructor
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
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> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
>
>
> 

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
www.Net-Workbooks.com
Sr. Technical Instructor

Blogs and organic groups at http://www.ccie.net

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