RE: OSPF & ip ospf net non-bro

From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Thu May 31 2001 - 18:41:33 GMT-3


   
Look at the next hop addresses on your spokes. What are they?

Do a show frame map. What is the output? Compare that to the next hop
addresses.

Do a debug ip packet and then ping from one spoke to the other. What is the
error you are getting? Why?

This is well documented, in Caslow, in the archives, in lots of other
places. And it is critical that you understand the issue and how to correct
it.

Chuck

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of . ..
Sent: Thursday, May 31, 2001 2:18 PM
To: ccielab@groupstudy.com
Subject: OSPF & ip ospf net non-bro

ok, there have been several of these posts and
instances in the archives but I've yet to see a
comprehensive answer. I understand the
characteristics of ospf non-bro nets and forming
adjaciencies but I still don't know why the spokes
can't ping each other. The routes are in the table.

Scenario...
                r3
               /
         r5--fr
              \
               r4

===> r5 (hub) <===
interface Serial0.3 multipoint
 ip address 140.11.51.5 255.255.255.0
 ip ospf network non-broadcast
 ip ospf hello-interval 10
 ip ospf priority 10
 frame-relay map ip 140.11.51.3 103 broadcast
 frame-relay map ip 140.11.51.4 104 broadcast

router ospf 1
 network 140.11.51.0 0.0.0.255 area 0
 neighbor 140.11.51.3 priority 1 poll-interval 30
 neighbor 140.11.51.4 priority 1 poll-interval 30

r5# sh ip ro
O 140.11.33.1/32 [110/1786] via 140.11.51.3,
00:17:23, Serial0.3
O 140.11.44.1/32 [110/1786] via 140.11.51.4,
00:17:23, Serial0.3
C 140.11.51.0/24 is directly connected,
Serial0.3

=====> r3 & r4 (basically the same, except the
obvious) <===

interface loopback 0
  ip address 140.11.33.1 255.255.255.0
(r4's loop is 140.11.44.1/24)

interface Serial0
 ip address 140.11.51.3 255.255.255.0
 encapsulation frame-relay
 ip ospf network non-broadcast
 ip ospf hello-interval 10
 frame-relay map ip 140.11.51.5 301 broadcast

router ospf 1
 network 140.11.33.0 0.0.0.255 area 0
 network 140.11.51.0 0.0.0.255 area 0
 neighbor 140.11.51.5 priority 10 poll-interval 30

r3# sh ip ro
C 140.11.33.0/24 is directly connected,
Loopback0
O 140.11.44.1/32 [110/65] via 140.11.51.4,
00:20:58, Serial0
C 140.11.51.0/24 is directly connected, Serial0

as you can see, both loopbacks show up in the spoke's
routing tables but the spokes can't ping each other.
the DR is the hub already.

Please help.
Thanks in advance.



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