Re: rpf neighbor seleciton

+ 1 to all for helping in clarification !

Tony you are correct but the order you specified is only used when
AD's are equal .

for instance a route learned by eigrp and internal MP- multicast BGP
...Then eigrp route is preferred to determine the rpf neighbor

On Sun, Jan 12, 2014 at 10:29 PM, Amir Mehri <mehri.amir_at_gmail.com> wrote:

> Hi Imran
>
> Please use the below link:
>
>
> http://www.cisco.com/en/US/tech/tk828/technologies_tech_note09186a0080094b55
> .shtml
>
> Cisco IOSR calculates the RPF interface in this way. Possible sources of
> RPF
> information are Unicast Routing Table, MBGP routing table, DVMRP routing
> table and Static Mroute table. When you calculate the RPF interface,
> primarily administrative distance is used to determine exactly which source
> of information the RPF calculation is based on. The specific rules are:
> All preceding sources of RPF data are searched for a match on the source IP
> address. When using Shared Trees, the RP address is used instead of the
> source address.
> If more than one matching route is found, the route with the lowest
> administrative distance is used.
>
> If the admin distances are equal, then this order of preference is used:
>
> Static mroutes
> DVMRP routes
> MBGP routes
> Unicast routes
>
> If multiple entries for a route occur within the same route table, the
> longest match route is used.
>
> Hope that help
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Imran Ali
> Sent: Sunday, January 12, 2014 10:12 PM
> To: Cisco certification
> Subject: Re: rpf neighbor seleciton
>
> i mean to say default mroute
>
>
> On Sun, Jan 12, 2014 at 9:40 PM, Imran Ali <immrccie_at_gmail.com> wrote:
>
> > Hi all
> >
> > in unicast routing next hop is selected based on longest match ,
> > then based on lower AD , then finally based on metric .
> >
> > in multicast how rpf next hop is selected ?
> >
> > is it based on longest match ? or AD ?
> >
> > let say i have default route over tunnel with a better AD , then
> > a more specific External Multi Protocol multicast Bgp
>
>
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Received on Sun Jan 12 2014 - 22:58:11 ART