From: Bob Sinclair (bsin@cox.net)
Date: Sat Feb 14 2004 - 23:20:07 GMT-3
Yasser,
Multicast static routes are used to calculate RPF (Reverse Path Forwarding)
information. They are local to the router, and are not redistributed.
Normally, PIM will use the unicast routing table to calculate the next hop
back toward the source of traffic or the Rendezvous Point. One scenario
when you would need to do a static mroute is when the next hop back toward
the source or RP is not multicast capable. If there is a static mroute for
a source then it will be used to calculate the RPF interface, rather than
the unicast routing table.
Here is a simple example that will tell the router to look for all sources
from 172.16.3.0/24 from a next-hop address of 172.16.123.3. Perhaps the
next hop for this network in the unicast routing table is 172.16.123.2,
which is not configured with PIM.
ip mroute 172.16.3.0 255.255.255.0 172.16.123.3
The best source for info is still Beau Williamson's book; Developing IP
Multicast Networks. Though Doyle volume 2 has good and recent info as well.
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "Yasser Aly" <blackyeyes00@hotmail.com>
To: <swm@emanon.com>; <rich@myhomemail.net>; <ccielab@groupstudy.com>
Sent: Saturday, February 14, 2004 8:36 PM
Subject: RE: Is ip mroute allowed?
> Sorry for the coming trivial question but my real life practice with
> multicast is limited.
>
> Where exactly the ip mroute command can be used ?
> Can it be configured on a router where multicast routing is not enabled
at,
> or it has to be enabled on a router that is multicast enabled.
>
> Can anyone explain how the ip mroute command is used in a simple example ?
>
> Regards,
> Yasser
>
> >From: "Scott Morris" <swm@emanon.com>
> 0
> >
> >"ip mroute" is NOT a static route! It does not MOVE traffic one way or
> >another.
> >
> >The "ip mroute" is used to provide an "allowed" path to receive multicast
> >traffic on. So it does not violate the rule of no static routes.
> >
> >If paranoid, I would simply suggest asking the proctor!
> >
> >
> >Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
CISSP,
> >JNCIS, et al.
> >IPExpert CCIE Program Manager
> >IPExpert Sr. Technical Instructor
> >swm@emanon.com/smorris@ipexpert.net
> >http://www.ipexpert.net
> >
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> >Richard Davidson
> >Sent: Saturday, February 14, 2004 6:22 PM
> >To: groupstudy
> >Subject: Is ip mroute allowed?
> >
> >Per the CCIE power session, static routes are explicitly not allowed
unless
> >requested. This leaves me with a plaguing question. Is ip mroute
allowed?
> >
> >=====
> >Richard Davidson
> >Yahoo IM: r1davidson
> >e-mail rich@myhomemail.net
> >
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