From: Venkatesh Palani (kvpalani@gmail.com)
Date: Sat Nov 05 2005 - 23:48:23 GMT-3
Hi Guys,
I wonder if NBMA and Point-Multipoint mode are interoperable(I mean one
interface configured as NBMA and the other configured as point-multipoint
should they form the neighbours in OSPF ?? ) which I always thought NO
becaue NBMA require DR/BDR where as P-M does not I am afraid if my
understanding is wrong .
look at this there are 4 routers just three is involved in this scenario so
consider router 2 (router id 2.2.2.2 <http://2.2.2.2>) router
3(3.3.3.3<http://3.3.3.3>)
and router 4( 4.4.4.4 <http://4.4.4.4>) . router 2 and router 3 OSPF is
configured as NBMA where as router 4 serial interafce is configured as
aPoint-multipoint. Router 1 forms Neighbor with both Router 2 and router 3
though there are no routes instaled by the OSPF in the routing table of
router 4. The same happens with router 2 and router 3 they for neighbor
relationship but no routes from router 4 are installed onto the routing
table.
any comments..any thoughts ???
From router 4
==================
Serial0/1 is up, line protocol is up
Internet Address 137.1.200.4/24 <http://137.1.200.4/24>, Area 0
Process ID 1, Router ID 4.4.4.4 <http://4.4.4.4>, Network Type
POINT_TO_MULTIPOINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_MULTIPOINT,
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:09
Index 1/2, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 2, Adjacent neighbor count is 2
Adjacent with neighbor 2.2.2.2 <http://2.2.2.2>
Adjacent with neighbor 3.3.3.3 <http://3.3.3.3>
Suppress hello for 0 neighbor(s)
Router4#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
2.2.2.2 <http://2.2.2.2> 1 FULL/ - 00:01:40 137.1.200.2
<http://137.1.200.2>Serial0/1
3.3.3.3 <http://3.3.3.3> 1 FULL/ - 00:01:30 137.1.200.3
<http://137.1.200.3>Serial0/1
debug
Router4#
*Mar 1 00:20:43.742: IP: s=137.1.200.3 <http://137.1.200.3> (Serial0/1), d=
137.1.200.4 <http://137.1.200.4>, len 76, rcvd
0
*Mar 1 00:20:43.742: OSPF: Rcv hello from 3.3.3.3 <http://3.3.3.3> area 0
from Serial0/1 137.1.2
00.3
*Mar 1 00:20:43.742: OSPF: End of hello processing
*Mar 1 00:20:58.153: IP: s=137.1.200.4 <http://137.1.200.4> (local), d=
224.0.0.5 <http://224.0.0.5> (Serial0/1), len 72
, sending broad/multicast
*Mar 1 00:21:09.788: IP: s=137.1.200.2 <http://137.1.200.2> (Serial0/1), d=
137.1.200.4 <http://137.1.200.4>, len 72, rcvd
0
*Mar 1 00:21:09.788: OSPF: Rcv hello from 2.2.2.2 <http://2.2.2.2> area 0
from Serial0/1 137.1.2
00.2
*Mar 1 00:21:09.788: OSPF: End of hello processing
*Mar 1 00:21:13.739: IP: s=137.1.200.3 <http://137.1.200.3> (Serial0/1), d=
137.1.200.4 <http://137.1.200.4>, len 76, rcvd
0
*Mar 1 00:21:13.743: OSPF: Rcv hello from 3.3.3.3 <http://3.3.3.3> area 0
from Serial0/1 137.1.2
00.3
*Mar 1 00:21:13.743: OSPF: End of hello processing
config snippet
interface Serial0/1
ip address 137.1.200.4 <http://137.1.200.4>
255.255.255.0<http://255.255.255.0>
encapsulation frame-relay
ip ospf network point-to-multipoint
no arp frame-relay
frame-relay map ip 137.1.200.1 <http://137.1.200.1> 403 broadcast
frame-relay map ip 137.1.200.2 <http://137.1.200.2> 402 broadcast
frame-relay map ip 137.1.200.3 <http://137.1.200.3> 403 broadcast
frame-relay map ip 172.168.2.1 <http://172.168.2.1> 403 broadcast
frame-relay map ip 172.168.2.2 <http://172.168.2.2> 403 broadcast
no frame-relay inverse-arp
router ospf 1
router-id 4.4.4.4 <http://4.4.4.4>
log-adjacency-changes
network 44.44.44.0 <http://44.44.44.0> 0.0.0.255 <http://0.0.0.255> area 4
network 137.1.200.0 <http://137.1.200.0> 0.0.0.255 <http://0.0.0.255> area 0
Router4#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
137.1.0.0/24 <http://137.1.0.0/24> is subnetted, 2 subnets
C 137.1.200.0 <http://137.1.200.0> is directly connected, Serial0/1
C 137.1.4.0 <http://137.1.4.0> is directly connected, Loopback1
160.1.0.0/24 <http://160.1.0.0/24> is subnetted, 1 subnets
C 160.1.1.0 <http://160.1.1.0> is directly connected, Ethernet0/1
44.0.0.0/24 <http://44.0.0.0/24> is subnetted, 1 subnets
C 44.44.44.0 <http://44.44.44.0> is directly connected, Loopback2
From Router 3
=====================
Serial0/0 is up, line protocol is up
Internet Address 137.1.200.3/24 <http://137.1.200.3/24>, Area 0
Process ID 1, Router ID 3.3.3.3 <http://3.3.3.3>, Network Type
NON_BROADCAST, Cost: 64
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 3.3.3.3 <http://3.3.3.3>, Interface address
137.1.200.3 <http://137.1.200.3>
Backup Designated router (ID) 2.2.2.2 <http://2.2.2.2>, Interface address
137.1.200.2 <http://137.1.200.2>
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
Hello due in 00:00:18
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 3
Last flood scan time is 0 msec, maximum is 4 msec
Neighbor Count is 3, Adjacent neighbor count is 3
Adjacent with neighbor 4.4.4.4 <http://4.4.4.4>
Adjacent with neighbor 2.2.2.2 <http://2.2.2.2> (Backup Designated Router)
Adjacent with neighbor 1.1.1.1 <http://1.1.1.1>
Suppress hello for 0 neighbor(s)
router3#sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
4.4.4.4 <http://4.4.4.4> 1 FULL/DROTHER 00:01:55
137.1.200.4<http://137.1.200.4>Serial0/0
2.2.2.2 <http://2.2.2.2> 1 FULL/BDR 00:01:50
137.1.200.2<http://137.1.200.2>Serial0/0
1.1.1.1 <http://1.1.1.1> 1 FULL/DROTHER 00:01:44
137.1.200.1<http://137.1.200.1>Serial0/0
config snippet
interface Serial0/0
ip address 137.1.200.3 <http://137.1.200.3>
255.255.255.0<http://255.255.255.0>
encapsulation frame-relay
no fair-queue
clockrate 128000
no arp frame-relay
frame-relay map ip 137.1.200.1 <http://137.1.200.1> 301 broadcast
frame-relay map ip 137.1.200.2 <http://137.1.200.2> 302 broadcast
frame-relay map ip 137.1.200.4 <http://137.1.200.4> 304 broadcast
no frame-relay inverse-arp
frame-relay lmi-type ansi
router ospf 1
router-id 3.3.3.3 <http://3.3.3.3>
log-adjacency-changes
network 33.33.33.0 <http://33.33.33.0> 0.0.0.255 <http://0.0.0.255> area 0
network 137.1.3.0 <http://137.1.3.0> 0.0.0.255 <http://0.0.0.255> area 3
network 137.1.200.0 <http://137.1.200.0> 0.0.0.255 <http://0.0.0.255> area 0
neighbor 137.1.200.4 <http://137.1.200.4> priority 1
neighbor 137.1.200.2 <http://137.1.200.2> priority 1
neighbor 137.1.200.1 <http://137.1.200.1> priority 1
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