Re: Well Known Multicast Addresses

From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Mar 13 2009 - 14:06:10 ARST

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
> >
> >
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> 

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

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