From: Brian Dennis (brian@5g.net)
Date: Tue Sep 03 2002 - 20:54:49 GMT-3
----R2
R1--
----R3
If R2 needs to send packets to R3 and the route to R3's address (/32) is
via the hub (R1) why would a mapping to R3 be needed on R2? R2 just
needs a mapping to R1.
If R2 didn't have a /32 route to R3 via R1 then a mapping would be
needed.
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Peng Zheng
Sent: Tuesday, September 03, 2002 12:29 PM
To: Brian Dennis; ccielab@groupstudy.com
Subject: RE: OSPF point-to-multipoint over frame-relay
But if it's NBMA, the map is required. Is it right?
--- Brian Dennis <brian@5g.net> wrote:
> It's true. With "ip ospf network
> point-to-multipoint" host routes are
> advertised so no additional mappings are needed.
>
> Brian Dennis, CCIE #2210 (R&S/ISP Dial)
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> Peng Zheng
> Sent: Tuesday, September 03, 2002 11:23 AM
> To: ccielab@groupstudy.com
> Subject: OSPF point-to-multipoint over frame-relay
>
> Hi,
>
> It's a hub-spoke configuration. Router E is hub,
> Router G and Router H are spokes.
>
> I thought I should configure frame map for E and H
> on
> G, but in CIM, their configuration are:
>
> --------------------------------------------------
> Router_E:
>
> interface Serial1
> ip address 170.170.9.5 255.255.255.0
> no ip mroute-cache
> encapsulation frame-relay
> ip ospf network point-to-multipoint
> frame-relay map ip 170.170.9.7 121 broadcast
> frame-relay map ip 170.170.9.8 123 broadcast
> router ospf 7
> network 170.170.9.0 0.0.0.255 area 0
> Router_G:
>
> interface Serial0
> no ip address
> encapsulation frame-relay
> frame-relay lmi-type ANSI
> !
> interface Serial0.5 multipoint
> ip address 170.170.9.7 255.255.255.0
> ip ospf network point-to-multipoint
> frame-relay map ip 170.170.9.5 112 broadcast
> router ospf 7
> network 170.170.9.0 0.0.0.255 area 0
>
------------------------------------------------------
>
> They said it's because Router E installed two host
> routes for H and G, So map for H on G is not
> required.
>
> Is this true?
>
> Thank you for help.
>
> Best Regards,
> Peng Zheng
>
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