From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sun Aug 03 2008 - 07:50:08 ART
My understanding of this network is that R3 and R4 are two ABRs.
>right but according to his HTML color coded email he unicasted to me and
BRIAN (I get html email's so I could see the color)
The ONLY area 0 link is the link between R3/R4. I have this happen to my
CCNP students all the time... and the slick ones catch on to what I'm doing
all the time... showing as usual that you can just go from area 1 to area 2
at an abr with 3 interfaces one in area 0, area 1, and area 3.
That traffic will take the area 0 path to hop over the space time continuum
back to the alternate 1985 and get to the area beyond the backbone...
lOL
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Thomas Perrier
Sent: Sunday, August 03, 2008 6:44 AM
To: Cisco certification
Subject: Re: EXPERT plz plz help...OSPF scnario brusting my head..
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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>
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