From: Chuck Ryan (chryan) (chryan@cisco.com)
Date: Fri May 16 2008 - 09:21:43 ART
Here are my configurations, nothing fancy, all pretty basic.
****** R1 *******
interface serial1/0
ip address 10.0.0.1 255.0.0.0
encapsulation frame-relay
no fair-queue
serial restart-delay 0
no arp frame-relay
frame-relay map ip 10.0.0.3 103
frame-relay map ip 10.0.0.2 102
no frame-relay inverse-arp
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
****** R2 *******
interface serial1/0
ip address 10.0.0.2 255.0.0.0
encapsulation frame-relay
no fair-queue
serial restart-delay 0
no arp frame-relay
frame-relay map ip 10.0.0.3 201
frame-relay map ip 10.0.0.1 201
no frame-relay inverse-arp
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
****** R3 *******
interface serial1/0
ip address 10.0.0.3 255.0.0.0
encapsulation frame-relay
no fair-queue
serial restart-delay 0
no arp frame-relay
frame-relay map ip 10.0.0.1 301
frame-relay map ip 10.0.0.2 301
no frame-relay inverse-arp
router ospf 1
network 0.0.0.0 255.255.255.255 area 0
Thanks,
Chuck
________________________________
From: Michel Grossenbacher [mailto:pashtuk@gmail.com]
Sent: Friday, May 16, 2008 6:41 AM
To: Chuck Ryan (chryan)
Cc: Hong Chan; Cisco certification
Subject: Re: ospf network type non-broadcast
Hi Chuck
Can you provide your FR and OSPF configs for all three Routers?
best regards
Michel
On 16/05/2008, Chuck Ryan (chryan) <chryan@cisco.com> wrote:
Hi Hong,
I dont have any problem establishing adjacencies with or without
the
neighbor statements configured under the ospf routing process.
That is
what I don't understand. I thought with a network type of
non-broadcast,
you have to manually define your neighbors on your DR in order
to
establish adjacencies. As it turns out for me, that's not the
case. I
can establish ospf adjacencies with the neighbor statements AND
without
the neighbor statements.
I'm trying to find out why this works with no neighbor
statements
configured, and no broadcast statement at the end of my
frame-relay map
statements.
Thanks,
Chuck
________________________________
From: Hong Chan [mailto:howard.chan34@gmail.com]
Sent: Friday, May 16, 2008 12:50 AM
To: Chuck Ryan (chryan)
Subject: Re: ospf network type non-broadcast
Where is your DR? Is that on the r1?
Try to add "ip ospf priority 0" on r2 & r3, add neighbor
statement on
r1. If still not able to form neighborship, try debug to see
how's the
hello packet talking.
2008/5/16 Chuck Ryan (chryan) <chryan@cisco.com>:
Hi GS,
I have a question about the ospf network type,
non-broadcast. In
a
simple 3 router pod, with r1 being the hub and r2 and r3
being
the
spokes, I've been reading how you need to configure a
neighbor
statement
under r1 in order to establish ospf adjacencies with r2
and r3.
When I lab it up and try it, it does work. What I have
also
found out,
is that no neighbor statement is necessary in order to
get ospf
adjacencies up between r1 and r2, and r1 and r3. Frankly,
I
don't see
the difference whether I manually define neighbors or
not, the
results
appear to be the same.
Can someone explain this behavior? I thought that if you
do not
specify
the neighbor statement, then the adjacencies will not
come up,
but that
doesn't appear to be the case. Also, I am not using the
"broadcast"
keyword on my frame-relay map statements.
Thanks,
Chuck
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