From: Godswill Oletu (oletu@inbox.lv)
Date: Mon May 22 2006 - 07:44:40 ART
Koen,
Static routes are different from static mroutes, the name says it all. One
is static unicast routes, that you are not allowed to use; the other is
static multicast route, that you are allow to use, except if that section
made it clear that, you should not use static multicast routes.
Sometimes, you cannot run away from using static mroutes, to create
additional RPF okays in your multicast routing table, for an RPF'ed address.
Static mroutes, do not affect your unicast routing table. If you want to
clarify, ask the proctor, but I will reserve more pressing questions for the
proctor.
HTH
Godswill Oletu
----- Original Message -----
From: "Koen Zeilstra" <koen@koenzeilstra.com>
To: <ccielab@groupstudy.com>
Sent: Monday, May 22, 2006 5:45 AM
Subject: Re: static mroutes allowed?
> 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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