From: Jason Guy \(jguy\) (jguy@cisco.com)
Date: Thu Jul 05 2007 - 11:46:05 ART
Ben,
I believe the broadcast keyword is only needed if the interface is going
to send multicast packets. So it depends on if the protocol running on
the interface needs to send multicast or unicast.
In your examples, OSPF in NBMA/P2MP-NMBA mode sends hellos as unicast.
In the case of RIP and EIGRP, by default they send everything as
multicast (broadcast for RIPv1). I think it is ok to add the broadcast
keyword to be safe, but that is probably not right for the lab and you
may lose points if the map is not correct for the situation. Obviously
if PIM is enabled for that FR link, you will need the broadcast keyword.
HTH,
Jason
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Ben
> Sent: Thursday, July 05, 2007 5:45 AM
> To: John Jones
> Cc: Cisco certification
> Subject: Re: FR static P2P mapping on physical interfaces
>
> John, Shiran
>
> Thank you for responding.
> I understand the use of "broadcast" in a hub and spoke scenario, and
why
> you
> need not send duplicate broadcasts from the spokes.
>
> In scenarios with point-to-point (P2P) connections, where the
requirement
> is
> to use main interfaces, no inverse-ARP, I do not understand when to
use
> the
> "broadcast" keyword with the "frame-relay map ip" command, and when
not to
> do so.
>
> The following situations come to mind:
>
> 1. If the IGP is OSPF in NBMA/P2MP-NMBA mode, do not use "broadcast"
> keyword.
>
> 2. If the IGP is OSPF in NBMA/P2MP-NMBA mode, use "broadcast" keyword.
>
>
> Are the above summations correct?
>
> If you use the "broadcast" keyword in situation 1. above, would you be
> penalised?
>
> Thanks
>
> Ben
>
>
>
>
>
> On 7/5/07, John Jones <acer0001@gmail.com> wrote:
> >
> > The "broadcast " keywork only needs to be used on one of the
mappings to
> > that DLCI. This avoids multiple broadcast packets from being
generated
> to
> > the same destination. Some labs have this as a requirement as well.
> >
> > John
> >
> >
> > On 7/5/07, Ben <bmunyao@gmail.com> wrote:
> > >
> > > Hi Group
> > >
> > > Some IE labs solution guides use the broadcast keyword on FR
static
> > > mappings
> > > for P2P FR on physical interfaces, while others do not.
> > >
> > > How do we determine when to use this keyword?
> > >
> > > Thanks
> > >
> > > Ben
> > >
> > >
>
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