From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sat Apr 30 2005 - 23:21:33 GMT-3
Frank,
Here are the steps you should use to build this OSPF network.
This is of course after you have tested basic connectively between all
directly connected routers.
1) Configure OSPF on R1 and R2. Verify the OSPF adjacency between R1 and
R2.
2) Ensure R1 and R2 see each others OSPF routes. The area 0 routes
should show up as inter area OSPF routes on R2.
3) Create the virtual link between R1 and R2. This should be done
BEFORE you add area 16 on R2.
4) Verify that the virtual link is working by using the "show ip ospf
virtual-link" command to see the adjacency state and/or by look at R2's
routing table. The area 0 routes should now show up as "intra area"
routes since R2 now has an interface (virtual-link) in area 0.
5) Configure area 16 on R2 and R3. Verify the OSPF adjacency between R2
and R3.
6) Ensure that R1 can see the area 16 routes. Also ensure that R3 can
see the area 0 and 15 routes.
7) Ping from R1 to R2's Fa0/0 interface.
8) Ping from R1 to R3's VLAN 15 interface.
11) Finally make area 16 a totally stubby area. Verify that R3 is now
only seeing any area 16 routes (should be none in this case) and a
default from R2.
12) Perform one last routing table verification and test connectivity.
If you use this type of process when you build a network, you
will find that you will have a lot less problems. You can not just
build a network and then say, "I can't ping". You should use a
methodical step-by-step process so that you find problems when the first
occur. This will not only help you in the CCIE lab but in your
day-to-day job.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Frank Center
Sent: Saturday, April 30, 2005 3:26 PM
To: Cisco certification
Subject: Problem with a Virtual-Link
I have a problem with an OSPF,
I have configured a frame-relay PPP using a sub-interface and
Virtual-Template
between two routers. R1 & R2, the R1 routers is attached to area 0. R2
is not
in area 0 and has a connection to R3. The area between R2 & R3 is a stub
area.
I configured a virtual-link between R1 & R2, I've attcahed the
configuration
below.
I can ping between the R1 & R2 over the frame-relay and from R2 I can
ping all
the IP's on both R1 & R3. From R3 I can ping R1.
The problem is I cannot ping R1 from R3 or R3 from R1?
In my troubleshooting I removed the stub but this did not help. I think
my
problem is with my virtual-link over the PPP but I've tried everything
that I
can thing of. Any suggestions?
R1
interface Serial0/1
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
!
interface Serial0/1.1 point-to-point
frame-relay interface-dlci 112 ppp Virtual-Template1
!
interface Virtual-Template1
ip address 20.20.20.1 255.255.255.0
!
router ospf 1
router-id 1.1.1.1
area 15 virtual-link 2.2.2.2
network 1.1.1.1 0.0.0.0 area 0
network 10.10.10.2 0.0.0.0 area 0
network 20.20.20.1. 0.0.0.0 area 15
(On R1 I have loopback 0 configured 1.1.1.1 and my E0 is connected to
the
backbone in area 0 ip 10.10.10.1)
R2
interface Serial1/1
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
!
interface Serial1/1.1 point-to-point
frame-relay interface-dlci 211 ppp Virtual-Template1
!
interface Virtual-Template1
ip address 20.20.20.2 255.255.255.0
ip ospf priority 0
!
interface FastEthernet0/0
ip address 30.30.30.2 255.255.255.0
!
router ospf 1
router-id 2.2.2.2
area 15 virtual-link 1.1.1.1
area 16 stub no-summary
network 2.2.2.2 0.0.0.0 area 15
network 20.20.20.2 0.0.0.0 area 15
network 30.30.30.2 0.0.0.0 area 16
(On R2 I have loopback 0 configured 2.2.2.2)
R3
interface Vlan15
ip address 30.30.30.3 255.255.255.0
!
router ospf 1
router-id 3.3.3.3
area 16 stub
network 3.3.3.3 0.0.0.0 area 16
network 30.30.30.3 0.0.0.0 area 16
(On R3 I have loopback 0 configured 3.3.3.3)
This archive was generated by hypermail 2.1.4 : Tue May 03 2005 - 07:55:11 GMT-3