From: Thomas Perrier (thomas@perrier.name)
Date: Sun Aug 03 2008 - 07:43:33 ART
On Sun, Aug 3, 2008 at 12:24 PM, Joseph Brunner <joe@affirmedsystems.com> wrote:
> I not Brian (he's a jedi master, I'm a jedi apprentice)
>
> But I'd bet I'm better at MS Exch 2003/2007!
>
> There is a requirement in OSPF that traffic between any two non-zero area's
> pass thru area 0 (the backbone). In your case I suspect another routing
> protocol is running, or an interface is not in the area you think its in.
My understanding of this network is that R3 and R4 are two ABRs. Then
it's normal behaviour that the traffic would take the R6-R4-R2-R1
path. Once arrived at R4, the traffic reached area 1, then takes the
shortest path through the area to R1. If you want to force traffic
from R4 to R3, then add an adjacency on the R3-R3 link in area 1.
-Thomas
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of dave
> dave
> Sent: Sunday, August 03, 2008 4:36 AM
> To: Joseph Brunner; bdennis@internetworkexpert.com
> Cc: Cisco certification
> Subject: Re: EXPERT plz plz help...OSPF scnario brusting my head..
>
> Hi Brian,
>
> What you told is seem to be my problem, can you please tell me how can i
> tackel this & make it work the way i want it should be work.
>
> Please tell me the OSPF route selection order in term of intra, inter, n1,
> n2, e1& e2.
>
> Regards,
> Dave
>
>
> On 8/3/08, Joseph Brunner <joe@affirmedsystems.com> wrote:
>>
>> 5.) when i am traceroute from R6 to R1 for 200.x.x.x it is taking the path
>> as follow:
>>
>> R6 --> R4 --> R2 --> R1-->200.x.x.x
>>
>>
>>
>> >On R6 show ip ospf database and please post the results and post "show ip
>> ospf database summary 200.x.x.x 255.x.x.x"
>>
>> >And on R6 please post show ip route. Do you have anything else running?
>> Eigrp? Bgp?
>>
>>
>>
>>
>>
>> i am expecting the path as below , thinking it is the best path to reach
>> destination.
>>
>> R6 --> R4 --> R3 --> R1-->200.x.x.x
>>
>>
>>
>> >Yes Between R6 (in Area 2) and R1 (in Area 1) traffic must route through
>> area 0, so it should go from R6, R4, <over area 0> R3, R1
>>
>>
>>
>> -Joe
>>
>>
>>
>>
>>
>> _____
>>
>> From: dave dave [mailto:funccie@gmail.com]
>> Sent: Saturday, August 02, 2008 10:48 PM
>> To: Cisco certification; bdennis@internetworkexpert.com;
>> blog@internetworkexpert.com; Joseph Brunner; Narbik Kocharians
>> Subject: EXPERT plz plz help...OSPF scnario brusting my head..
>>
>>
>>
>> Hi Expert,
>>
>>
>>
>> net: 200.0.0.0/24
>>
>> --------------------------
>>
>> | |
>>
>> R1 ---------------- R2
>>
>> | |
>>
>> R3=========R4 << === it means 2 physical L2 links ether channel as
> e.g.
>> L2 Po1 & Vlan 100 running on R3 as well as R4 to to form ospf neighborship
>> over L2 port channel. Vlan 100 in area 0
>>
>> | |
>>
>> R5----------------R6
>>
>> | |
>>
>> -------------------------
>>
>> net: 100.0.0.0/24
>>
>>
>>
>> Note :
>>
>> this color represting the ospf area 2
>>
>> this color represting the ospf area 1
>>
>> this color represting the ospf area 0
>>
>>
>>
>> 1) R1, R2 & including links of R1 & R2 connected to R3 & R4 are on OSPF
>> area
>> 1
>>
>> 2) R5, R6 & including links of R5 & R6 connected to R3 & R4 are on OSPF
>> area
>> 2
>>
>> 3) All links are 100 Mbps.
>>
>> 4) L2 ether channel of each 100 Mbps links between the R3 & R4 is for vlan
>> 100 ospf neighborship
>>
>> 5.) when i am traceroute from R6 to R1 for 200.x.x.x it is taking the path
>> as follow:
>>
>> R6 --> R4 --> R2 --> R1-->200.x.x.x
>>
>> i am expecting the path as below , thinking it is the best path to reach
>> destination.
>>
>> R6 --> R4 --> R3 --> R1-->200.x.x.x
>>
>>
>>
>> Regards,
>>
>> Dave
>>
>>
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