From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Mon Nov 07 2005 - 06:51:16 GMT-3
Uhhh Sorry Scott, your are right, maybe with all this studies am starting to
mix stuffs...
Thanks to point me back in the correct direcction...
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/ >) 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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