From: Nnanna Obuba (obuba@xxxxxxxxx)
Date: Thu Oct 19 2000 - 12:50:57 GMT-3
check your frame-relay map statements and ensure that
the keyword 'broadcast' is included at the end, of
course u also need to make sure the ip ospf network
types are the same
Nnanna
--- mannan venkatesan <venkat_m@ins.com> wrote:
> Hi,
> Thank you all for your feedbacks. Last night I was
> trying to configure a
> simple P-O-P ospf config. over FR which I have done
> many times before. But I
> couldn't get it work. I was able to ping from one
> router to other. In R1, sh
> ip ospf showed 'Area BACKBONE(0) (Inactive) '. I
> don't understand why area 0
> is inactive. Can someone help me?
>
> Thanks,
> Mannan
>
> -----Original Message-----
> From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com]On Behalf Of
> Justin Menga
> Sent: Wednesday, October 18, 2000 7:08 PM
> To: 'mannan venkatesan'; ccielab@groupstudy.com
> Subject: RE: OSPF Problem
>
>
> Network was broken because R3 is the DR and can't
> communicate with R2 for
> the Type 2 LSA. Try using ip ospf priority 0 on R3
> on the subinterface to
> force R1 to become the DR.
>
> The hub always should be the DR..........
>
> Regards,
>
> Justin Menga MCSE+I CCNP CCSE ASE
> WAN Specialist
> Computerland New Zealand
> PO Box 3631, Auckland
> DDI: (+64) 9 360 4864 Mobile: (+64) 25 349 599
> mailto: justin.menga@computerland.co.nz
>
>
> -----Original Message-----
> From: mannan venkatesan [mailto:venkat_m@ins.com]
> Sent: Wednesday, 18 October 2000 4:07 a.m.
> To: ccielab@groupstudy.com
> Subject: OSPF Problem
>
>
> Hi,
> I was playing in ospf over FR lab and came across an
> interesting problem(I
> was trying to simulate the problem we had in our
> client production network).
> I configured R1 as hub (sub-ifs) and R2 and R3 as
> spoke (physical
> interface). Here the config,
>
> R1 :
> interface Serial0.1 point-to-point
> ip address 10.1.0.1 255.255.0.0
> ip ospf network broadcast
> frame-relay interface-dlci 100
> !
> interface Serial0.2 point-to-point
> ip address 10.2.0.1 255.255.0.0
> ip ospf network Point-to-multipoint
> frame-relay interface-dlci 103
>
> router ospf 10
> network 10.0.0.0 0.255.255.255 area 0
>
> R2 :
> interface Serial0
> ip address 10.1.0.2 255.255.0.0
> encapsulation frame-relay
> ip ospf network Point-to-multipoint
> frame-relay map ip 10.1.0.1 106
>
> router ospf 10
> network 10.0.0.0 0.255.255.255 area 0
>
> R3:
> interface Serial0
> ip address 10.2.0.2 255.255.0.0
> encapsulation frame-relay
> ip ospf network Point-to-multipoint
> frame-relay map ip 10.2.0.1 106
>
> router ospf 10
> network 10.0.0.0 0.255.255.255 area 0
>
> It worked fine with this config. Then I changed OSPF
> network type to
> "Broadcast" in s0 of R3 and s0.2 of R1. R3 became DR
> and R1 became BDR.
> After I changed OSPF network type to "Broadcast" in
> s0.1 of R1 and s0 of R2.
> As soon as I entered network type 'broadcast' in R2,
> the network broke. I
> couldn't access any of the routers for 5 minutes.
>
> Now 'sh ip ospf nei' command shows,
>
> R1:
> Neighbor ID Pri State Dead Time
> Address Interface
> 10.1.0.2 1 FULL/BDR 00:00:39
> 10.1.0.2 Serial0.1
> 10.2.0.2 1 FULL/BDR 00:00:37
> 10.2.0.2 Serial0.2
>
> R2:
> Neighbor ID Pri State Dead Time
> Address Interface
> 10.2.0.1 1 FULL/DR 00:00:31
> 10.1.0.1 Serial0
>
> R3:
> Neighbor ID Pri State Dead Time
> Address Interface
> 10.2.0.1 1 FULL/DR 00:00:39
> 10.2.0.1 Serial0
>
> I know DR and BDR election was going on, but why the
> network broke? During
> election, routers multicast packets and we have only
> 3 routers. So, what
> traffic did the routers send here? Can I have
> multiple OSPF network in one
> broadcast medium? Can someone clarify my questions?
> Think I am missing
> something here.
>
> Thanks,
> Mannan Venkatesan
>
>
>
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