From: Schulz, Dave (DSchulz@dpsciences.com)
Date: Sun Nov 06 2005 - 01:22:22 GMT-3
I ran into this issue once before. It can be very puzzling, because the
neighbors fill form a relationship, but the routes will not be exchanged
properly. My understanding is that the non-broadcast and non-broadcast (that
require a DR) will work together. And, the point-to-point and
point-to-multipoint will work together (that do not require a DR). So, even
though you form a neighbor relationship, one can never assume that everything
is correct.
Dave
-----Original Message-----
From: nobody@groupstudy.com
To: ccielab@groupstudy.com
Sent: 11/5/2005 9:56 PM
Subject: Re: OSPF NBMA and P-M interoperable ???
Sory guys a bit of correction
the correct one is
> 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 4 forms Neighbor
with
> both Router 2 and router 3 though there are no OSPF routes instaled in
the
> routing table of router 4. The same happens with router 2 and router 3
they
> form neighbor relationship with router 4 but no routes from router 4 (
> meaning the loopback of router 4 which is configured in the OSPF using
> network statement) 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
>
>
Thank you,
Venkatesh
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