RE: rpf neighbor seleciton

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 - 22:59:57 ART