From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Mon May 22 2006 - 07:02:58 ART
In almost any study materials they say that mroute is not a real unicast
route, it doesn't affect any unicast flow etc, so the ban of static
routes is not applicable here.
I don't say you cannot use it, personally I used that and got 100% in
multicast section for that, but this also might be a trap. So I would
use it with care.
A.
on 22/05/2006 11:45 Koen Zeilstra wrote:
> In my example I think mroutes are the only way. If you use ip unnumbered
> on the tunnel and run OSPF through it, you would end up with recursive
> routing.
>
> You are right about asking the proctor. However I would like to know as
> much as these requirements and rules in advance in order to save time.
>
> -----------------------
> Lackland's Laws:
> (1) Never be first.
> (2) Never be last.
> (3) Never volunteer for anything
>
> On Mon, 22 May 2006, Alexei Monastyrnyi wrote:
>
> | From my experience, if you think you have to use a static mroute, you'd better
> | check if you meet all requirements in unicast routing tasks. Those tasks can
> | be implicitly bound to mcast RPF check issues.
> |
> | Example is like this.
> |
> | Two routers (R2 and R4) are connected as spokes to FR-hub R3 and get routes to
> | the rest of the POD via OSPF. At the same time they share a /24 subnet across
> | their Ethernet ports with RIP on top.
> |
> | Unicast routing requires R4 to prefer routes learned via RIP to those learned
> | via OSPF.
> |
> | Mcast task can ask you to configure R2-R3-R5 as mcast domain and then join R4
> | to this domain via its Ethernet interface. Failure to to solve the unicast
> | routing task above would make you think about mroute on R4 cause RPF check
> | fails since R4 still learns its unicast routes via OSPF/FR but not via
> | RIP/Ethernet.
> |
> | Just my two cents here... Otherwise ask a proctor, if you thinks mroute is the
> | only way... Just to be on the safe side. :-)
> |
> | A.
> |
> | on 22/05/2006 10:47 Koen Zeilstra wrote:
> | > Hi Group,
> | >
> | > Static routes are not permitted. What about static mroutes?
> | >
> | > If your multicast traffic has to pass non multicast routers, this is usualy
> | > done by applying GRE tunnels. To make the router expect the traffic coming
> | > from the tunnel interface and pass the RPF check you have to use mroutes.
> | > AFAIK this is the only way. Are mroutes allowed on the exam? Or is there
> | > another way to accomplish this objective.
> | >
> | > regards,
> | >
> | > Koen
> | >
> | > -----------------------
> | > It may be bad manners to talk with your mouth full, but it isn't too
> | > good either if you speak when your head is empty.
> | >
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