From: Herve Bruyere (hbruyere@cisco.com)
Date: Tue Feb 18 2003 - 12:48:07 GMT-3
It is ipexpert section 20, isn't it? :)
By the way they are quite crazy to ask such requirements. Come on, policy routing
instead of frame-relay map!!!
In that question, the hub had three frame map statements, one to each spoke,
is that your case as well?
If we take R3: you need a "ip local policy" for packets originated by R3,
and a policy on the ethernet of R3 to change the next hop of packets
coming from R5. But not on the serial: packets from R1 doesn't need to
be policy routed.
Regards,
Herve
Hunt Lee wrote:
> Hi Group,
>
> Can someone please explain to me how Policy Routing works??
>
> On a scenario that I'm working on:-
>
> R1
> / | \
> R2 R3 R4
> |
> R5
>
>
> R1, 2, 3 & 4 are on a hub & spoke topology, and all the routers has a
> Ethernet interface attached individually (apart from R3)
>
> If I want the spokes to be able to talk to each other without additional
> frame-relay map ip statements, I understand that I will need to use local
> policy routing.
>
> For Policy Routing, as I understand it, when packets are received on an
> interface, policy routing just looks at the "route-map" and delegate the
> packets accordingly (based on the "set" & match" command).
>
> On the model answer, I was told that the policy routing needs to be applied
> to all the spoke routers' outgoing Frame-Relay interfaces (i.e. R2, 3 & 4).
> But on R3, it says that I will also need to apply Policy Routing to its
> internal interface towards R5 (so R3 now has applied Policy routing twice,
> once on each interface).
>
> Can anyone explains to me why?? And if R3 is correct, wouldn't I need to
> apply Policy Routing on all the Ethernet interfaces on the other spokes (R2
> & R4) as well?
>
> Would appreciated any help on this.
>
> Regards,
> Hunt
>
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