From: Bob Sinclair (bob@bobsinclair.net)
Date: Fri Mar 13 2009 - 19:52:57 ARST
Hello Raghav,
Here is the rule I would recommend for broadcast keywords on static Frame
Relay maps. Assuming that you need to send multicasts or broadcasts on a
PVC, then you need one broadcast keyword per PVC, per protocol.
So if you have 2 unicast IPv4 static maps to PVC 102, then at least one of
those maps needs to have the broadcast keyword. It makes no difference which
unicast map has the broadcast keyword, self, hub or far spoke. It simply
does not matter.
If you also have IPv6 static maps on an interface, then at least one of
those will need a broadcast keyword, if you want to send multicast packets
on the pvc. It makes no difference which unicast static map has the
broadcast keyword: it could be a routable address mapping or a link-local
address mapping, to the hub, or to the spoke.
In other words: one broadcast keyword per PVC, per protocol. WHICH unicast
map makes absolutely no difference!
As you suggest, having more than one broadcast keyword per pvc, per protocol
could waste bandwidth by duplicating broadcast or multicast packets.
HTH,
-Bob Sinclair CCIE 10427 CCSI 30427
www.netmasterclass.net
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Raghav Bhargava
> Sent: Friday, March 13, 2009 5:31 PM
> To: Cisco certification
> Subject: Confusion regarding FR
>
> Hi Experts,
>
> I have some confusion in FR regarding the broadcast keyword. Here is
> what i
> understand . Please correct me wherever I am wrong.
>
> 1. FR multipoint between Hub and spokes ( *Serial Interface* )
>
> ----> When doing this we use the keyword broadcast on all i.e- hub as
> well
> as spokes as long as spokes are not mapping to each one of them. Also
> this
> configuration is done on the serial Interface not the sub interface
> Now when we have to map spokes to each other then we don't use
> broadcast as
> it will send duplicate routes to the hub.
>
> 2. FR multipoint between Hub and spokes ( *Serial sub-Interface* )
>
> -----> When we configure a sub-interface with multipoint on the hub
> side for
> each of the spoke , now do we use the keyword broadcast ???? yes or
> no..I
> really don know
>
> But if someone can shed some light that will be great...
>
>
> --
> Warm Regards
> Raghav
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:05 ART