From: Scott Morris (smorris@internetworkexpert.com)
Date: Mon Aug 04 2008 - 19:59:28 ART
Check your path to the ASBR.
_____
From: dave dave [mailto:funccie@gmail.com]
Sent: Monday, August 04, 2008 2:18 PM
To: Cisco certification; bdennis@internetworkexpert.com;
blog@internetworkexpert.com; Joseph Brunner; Narbik Kocharians
Subject: Re: EXPERT plz plz help...OSPF scnario brusting my head..
Hi,
I am learning the 100.100.100.0 as external route on R3 but TRACE FROM R1
choosing the R3 => R5 => R6 INSTEAD of R3 -> R4-> R6. why ????
r3#sh ip ro 100.100.100.0
Routing entry for 100.100.100.0/24
Known via "ospf 1", distance 110, metric 220, type extern 1
Last update from 10.66.2.5 on FastEthernet1/10, 00:16:49 ago
Routing Descriptor Blocks:
* 10.66.2.5, from 100.2.2.2, 00:16:49 ago, via FastEthernet1/10
Route metric is 220, traffic share count is 1
r3#
*Mar 1 00:46:14.183: %OSPF-5-ADJCHG: Process 1, Nbr 100.1.1.1 on
FastEthernet1/
10 from FULL to DOWN, Neighbor Down: Dead timer expired
r3#sh ip ro 100.100.100.0
Routing entry for 100.100.100.0/24
Known via "ospf 1", distance 110, metric 121, type extern 1
Last update from 10.66.0.2 on Vlan100, 00:07:13 ago
Routing Descriptor Blocks:
* 10.66.0.2, from 100.2.2.2, 00:07:13 ago, via Vlan100
Route metric is 121, traffic share count is 1
r3#
On 8/3/08, dave dave <funccie@gmail.com> wrote:
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
Blogs and organic groups at http://www.ccie.net
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