From: Shanky (shankyz@gmail.com)
Date: Mon Nov 07 2005 - 06:38:00 GMT-3
Hi,
I think the two routers .. one using NBMA and the other using P2MP form
neighbors because
the hello timers (30/120) and other requirements for forming a neighborship
are satisfied but they wont exchange routes. the NBMA side will become the
DR, but it wont push routes to the P2MP side.
The key I think is to remember -- the network types on both sides need to
be compatible ie
NBMA -- Broadcast
OR
P2P -- P2MP ( Non Broadcast included)
Guys correct me if I am wrong.
Thanks
Shanky
On 11/6/05, Scott Morris <swm@emanon.com> wrote:
>
> ???
>
> I think I know what you're trying to say, but it's backwards!
>
> Of the 5 network types that OSPF has, the key I mentioned was that
> anything
> using the "point" word does NOT use a DR. That would include
> "point-to-multipoint non-broadcast".
>
> The extra benefit (?) we get from this network type is the specific use of
> the neighbor command. And some other festive features. But there is no DR
> present.
>
> HTH,
>
> Scott
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Victor Cappuccio
> Sent: Saturday, November 05, 2005 11:33 PM
> To: Schulz, Dave; Venkatesh Palani ; nobody@groupstudy.com;
> ccielab@groupstudy.com
> Subject: Re: OSPF NBMA and P-M interoperable ???
>
> There is other network type like ip ospf network point-to-multipoint
> non-broadcast, that would req a DR election using the Neighbor command on
> the HuB and setting the priority on the spokes, this is very useful for
> the
> hub and spoke topology that requires different BW allocations
>
> I learnt this from Scott Morris (has a broadcast keyword somewhere that
> equals DR),
>
>
> HTH
>
> ---
> Victor Cappuccio
> cvictor@protokolgroup.com
> ..O.
> ....O
> OOO
> ----- Original Message -----
> From: "Schulz, Dave" <DSchulz@dpsciences.com>
> To: "Venkatesh Palani " <kvpalani@gmail.com>; <nobody@groupstudy.com>;
> <ccielab@groupstudy.com>
> Sent: Sunday, November 06, 2005 12:22 AM
> Subject: RE: OSPF NBMA and P-M interoperable ???
>
>
> > 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> <
> http://2.2.2.2/>) router 3(
> > > 3.3.3.3 <http://3.3.3.3> <http://3.3.3.3/>) and router 4(
4.4.4.4<http://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> <
> http://137.1.200.4/24>, Area 0
> > > Process ID 1, Router ID 4.4.4.4 <http://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> <http://2.2.2.2/>
> > > Adjacent with neighbor 3.3.3.3 <http://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> <http://2.2.2.2/> 1 FULL/ - 00:01:40
> > 137.1.200.2 <http://137.1.200.2><http://137.1.200.2/>Serial0/1
> > > 3.3.3.3 <http://3.3.3.3> <http://3.3.3.3/> 1 FULL/ - 00:01:30
> > 137.1.200.3 <http://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> <
> http://137.1.200.3/>
> > (Serial0/1),
> > > d=137.1.200.4 <http://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> <
> 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> <
> http://137.1.200.4/> (local),
> > d=224.0.0.5 <http://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> <
> http://137.1.200.2/>
> > (Serial0/1),
> > > d=137.1.200.4 <http://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> <
> 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>
> > <http://137.1.200.3/>(Serial0/1),
> > > d=137.1.200.4 <http://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> <
> 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> <http://137.1.200.4/>
> > 255.255.255.0 <http://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> <
> http://137.1.200.1/> 403 broadcast
> > > frame-relay map ip 137.1.200.2 <http://137.1.200.2> <
> http://137.1.200.2/> 402 broadcast
> > > frame-relay map ip 137.1.200.3 <http://137.1.200.3> <
> http://137.1.200.3/>403 broadcast
> > > frame-relay map ip 172.168.2.1 <http://172.168.2.1> <
> http://172.168.2.1/> 403 broadcast
> > > frame-relay map ip 172.168.2.2 <http://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> <http://4.4.4.4/>
> > > log-adjacency-changes
> > > network 44.44.44.0 <http://44.44.44.0> <http://44.44.44.0/>
0.0.0.255<http://0.0.0.255><
> http://0.0.0.255/>
> > area
> > > 4
> > > network 137.1.200.0 <http://137.1.200.0> <http://137.1.200.0/>
> 0.0.0.255 <http://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> <http://137.1.0.0/24> is subnetted,
> 2 subnets
> > > C 137.1.200.0 <http://137.1.200.0> <http://137.1.200.0/> is directly
> connected, Serial0/1
> > > C 137.1.4.0 <http://137.1.4.0> <http://137.1.4.0/> is directly
> connected, Loopback1
> > > 160.1.0.0/24 <http://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> <http://160.1.1.0/> is directly
> connected, Ethernet0/1
> > > 44.0.0.0/24 <http://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> <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> <
> http://137.1.200.3/24>, Area 0
> > > Process ID 1, Router ID 3.3.3.3 <http://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> <http://3.3.3.3/>,
> Interface address
> > > 137.1.200.3 <http://137.1.200.3> <http://137.1.200.3/>
> > > Backup Designated router (ID) 2.2.2.2 <http://2.2.2.2> <
> http://2.2.2.2/>, Interface
> > address
> > > 137.1.200.2 <http://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> <http://4.4.4.4/>
> > > Adjacent with neighbor 2.2.2.2 <http://2.2.2.2> <http://2.2.2.2/>
> (Backup Designated
> > > Router)
> > > Adjacent with neighbor 1.1.1.1 <http://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> <http://4.4.4.4/> 1 FULL/DROTHER 00:01:55
> > 137.1.200.4 <http://137.1.200.4><http://137.1.200.4/>Serial0/0
> > > 2.2.2.2 <http://2.2.2.2> <http://2.2.2.2/> 1 FULL/BDR 00:01:50
> > 137.1.200.2 <http://137.1.200.2><http://137.1.200.2/>Serial0/0
> > > 1.1.1.1 <http://1.1.1.1> <http://1.1.1.1/> 1 FULL/DROTHER 00:01:44
> > 137.1.200.1 <http://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> <http://137.1.200.3/>
> > 255.255.255.0 <http://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> <
> http://137.1.200.1/> 301 broadcast
> > > frame-relay map ip 137.1.200.2 <http://137.1.200.2> <
> http://137.1.200.2/> 302 broadcast
> > > frame-relay map ip 137.1.200.4 <http://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> <http://3.3.3.3/>
> > > log-adjacency-changes
> > > network 33.33.33.0 <http://33.33.33.0> <http://33.33.33.0/>
0.0.0.255<http://0.0.0.255><
> http://0.0.0.255/>
> > area
> > > 0
> > > network 137.1.3.0 <http://137.1.3.0> <http://137.1.3.0/>
0.0.0.255<http://0.0.0.255><
> http://0.0.0.255/>
> > area 3
> > > network 137.1.200.0 <http://137.1.200.0> <http://137.1.200.0/>
> 0.0.0.255 <http://0.0.0.255>
> > <http://0.0.0.255/>area
> > 0
> > > neighbor 137.1.200.4 <http://137.1.200.4> <http://137.1.200.4/>
> priority 1
> > > neighbor 137.1.200.2 <http://137.1.200.2> <http://137.1.200.2/>
> priority 1
> > > neighbor 137.1.200.1 <http://137.1.200.1> <http://137.1.200.1/>
> priority 1
> > >
> > >
> >
> > Thank you,
> > Venkatesh
> >
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