From: John Howell (jhowell@xxxxxxxxxxxx)
Date: Mon May 17 1999 - 17:53:30 GMT-3
Title: RE: OSPF Trivia
That is the answer. Because the spokes do not have frame map commands
for the other spoke router it can not talk. Since R3 has the
interface with the highest IP it becomes the DR. Since R2 can not
talk to R3 and only to the hub it looses all routes.
Thanks,
John T. Howell
Cohesive Technology Solutions
Senior Consultant/Engineer
CCNP/CCDP, MCSE+I, MCNE
225-751-6100
225-751-6200 (fax)
-----Original Message-----
From: Nentarz, Dave [mailto:Dave.Nentarz@compaq.com]
Sent: Monday, May 17, 1999 3:46 PM
To: 'John Howell'; GroupStudy (E-mail)
Subject: RE: OSPF Trivia
John
I'm not sure in your particular case, but I did notice that your hub
router
is not "guaranteed" to be the OSPF Designated Router for the "Wan
Segment".
I usually always configure the Hub Serial interface (or sub interface)
with
a "ip ospf priority 2" and then I give the spoke routers "ip ospf
priority
0". This will guarantee that the hub router will always be the OSPF DR
on
the WAN - the way you want it to be!!!
Add it to your config, restart ospf and see if it works.
Dave
-----Original Message-----
From: John Howell [mailto:jhowell@cohesive.com]
Sent: Monday, May 17, 1999 4:22 PM
To: GroupStudy (E-mail)
Subject: OSPF Trivia
I thought that I would change the subject since we have beat IPX to
death.
Below is a setup for a multipoint Frame network. Why does router R2
loose
all OSPF routes when the PVC to R6 comes up? Why does R3 and R6
maintain
routes from OSPF?
R6 (hub)
interface Serial0
no ip address
encapsulation frame-relay
!
interface Serial0.1 multipoint
ip address 170.100.2.1 255.255.255.0
frame-relay interface-dlci 202
frame-relay interface-dlci 203
interface Ethernet0
ip address 170.100.70.1 255.255.255.0
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
neighbor 170.100.2.3
neighbor 170.100.2.2
R2 (spoke)
interface Serial0
ip address 170.100.2.2 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.2.1 102 broadcast
interface Ethernet0
ip address 170.100.82.1 255.255.255.192
interface TokenRing0
ip address 170.100.81.1 255.255.255.0
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
network 170.100.82.0 0.0.0.63 area 2
network 170.100.81.0 0.0.0.255 area 5
R3 (spoke)
interface Serial0
ip address 170.100.2.3 255.255.255.0
encapsulation frame-relay
frame-relay map ip 170.100.2.1 103 broadcast
interface Async1
ip address 170.100.90.1 255.255.255.248
encapsulation ppp
async default routing
async dynamic routing
async mode dedicated
interface Ethernet0
ip address 170.100.82.2 255.255.255.192
router ospf 100
network 170.100.2.0 0.0.0.255 area 0
network 170.100.82.0 0.0.0.63 area 2
network 170.100.90.0 0.0.0.7 area 3
area 3 virtual-link 170.100.101.1
Thanks,
John T. Howell
Cohesive Technology Solutions
Senior Consultant/Engineer
CCNP/CCDP, MCSE+I, MCNE
225-751-6100
225-751-6200 (fax)
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