From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Tue Jan 23 2001 - 13:47:46 GMT-3
Paul
There are several issues here which will include questions of
whether a DR is needed or not (the hub with multipoint non-broadcast
will say yes while the point to point spokes will say no) and if
so which router is to be DR (it is better to prevent the spokes
than it is to enhance the priority of the hub). You should also
take a look at the timers on the interfaces. If the hello and
dead timers do not match, the routers will not get past the
INIT state to two way and exchange of LSAs.
Rick
Rick Burts, CCSI CCIE 4615 burts@mentortech.com
Mentor Technologies 240-568-6500 ext 6652
133 National Business Parkway 240-568-6515 fax
Annapolis Junction, Md 20701
Chesapeake Network Solutions has now become Mentor Technologies.
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We offer most of the Cisco training courses.
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On Tue, 23 Jan 2001, Paul Adams wrote:
> Greeting All,
>
> While playing around on a few routers last night, I encountered the
> following issue:
>
>
> ________
> | |-----------------R2
> R1---------- FS |
> |_______ |-------------R4
>
> The objective was to use Physical -no sub int's on R1 and Point to Point
> ints on R2 & R3.
> Exchange OSPF routes between hub and spokes with one restriction- NO ip
> ospf network multipoint command- on R1 or point to point on R1
>
> Is this doable? or is it a must to use point to multipoint in this
> situation?
>
> Please review the configs when the opportunity permits.
>
> I also tried to set R1 ip ospf priority to zero so no one would
> become the DR since P to P's do not support a DR but the
> neighbors just stayed in INIT mode
>
> In the following config, the neighbors become adjacent but no
> routes are being exchanged......
>
> Thanks for any insight....
>
>
> R1 (HUB)
> interface Serial0
> ip address 172.16.1.1 255.255.255.0
> no ip directed-broadcast
> encapsulation frame-relay
> no ip mroute-cache
> frame-relay map ip 172.16.1.4 400 broadcast
> frame-relay map ip 172.16.1.2 200 broadcast
> frame-relay lmi-type ansi
>
> R1#sh ip ospf ne
>
> Neighbor ID Pri State Dead Time Address Interface
> 4.5.5.5 0 FULL/DROTHER 00:01:56 172.16.1.4 Serial0
> 8.8.8.8 0 FULL/DROTHER 00:01:42 172.16.1.2 Serial0
>
> R1#sh ip ospf int s0
> Serial0 is up, line protocol is up
> Internet Address 172.16.1.1/24, Area 0
> Process ID 1, Router ID 2.2.2.2, Network Type NON_BROADCAST, Cost: 64
> Transmit Delay is 1 sec, State DR, Priority 1
> Designated Router (ID) 2.2.2.2, Interface address 172.16.1.1
> No backup designated router on this network
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:14
> Neighbor Count is 2, Adjacent neighbor count is 2
> Adjacent with neighbor 4.5.5.5
> Adjacent with neighbor 8.8.8.8
> Suppress hello for 0 neighbor(s)
>
> R1#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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 2.0.0.0/24 is subnetted, 3 subnets
> C 2.0.0.0 is directly connected, Loopback32
> C 2.1.1.0 is directly connected, Loopback1
> C 2.2.2.0 is directly connected, Loopback0
> 172.16.0.0/24 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected, Serial0
> ****************************************************************************
> ****
>
> R2 (spoke)
> interface Serial0
> no ip address
> no ip directed-broadcast
> encapsulation frame-relay
> no ip mroute-cache
> frame-relay lmi-type ansi
> !
> interface Serial0.1 point-to-point
> ip address 172.16.1.2 255.255.255.0
> no ip directed-broadcast
> ip ospf hello-interval 30
> ip ospf priority 0
> frame-relay interface-dlci 200
>
> R2#sh ip ospf ne (Note R1 int lo0 is 2.2.2.2 /24)
>
> Neighbor ID Pri State Dead Time Address Interface
> 2.2.2.2 1 FULL/ - 00:01:45 172.16.1.1 Serial0.1
>
> R2#sh ip ospf int s0.1
> Serial0.1 is up, line protocol is up
> Internet Address 172.16.1.2/24, Area 0
> Process ID 1, Router ID 8.8.8.8, Network Type POINT_TO_POINT, Cost: 64
> Transmit Delay is 1 sec, State POINT_TO_POINT,
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:17
> Neighbor Count is 1, Adjacent neighbor count is 1
> Adjacent with neighbor 2.2.2.2
> Suppress hello for 0 neighbor(s)
>
> R2#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, * - candidate
> default
> U - per-user static route, o - ODR
>
> Gateway of last resort is not set
>
> 172.16.0.0/24 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected, Serial0.1
> 7.0.0.0/24 is subnetted, 3 subnets
> C 7.9.9.0 is directly connected, Loopback2
> C 7.8.8.0 is directly connected, Loopback1
> C 7.7.7.0 is directly connected, Loopback0
> 8.0.0.0/24 is subnetted, 1 subnets
> C 8.8.8.0 is directly connected, Loopback5
>
> ****************************************************************************
> ****************************************
> R4 (spoke)
> interface Serial0
> no ip address
> encapsulation frame-relay
> !
> interface Serial0.1 point-to-point
> ip address 172.16.1.4 255.255.255.0
> ip ospf hello-interval 30
> ip ospf priority 0
> frame-relay interface-dlci 400
>
> R4#sh ip ospf ne
>
> Neighbor ID Pri State Dead Time Address Interface
> 2.2.2.2 1 FULL/ - 00:01:58 172.16.1.1 Serial0.1
>
> R4#sh ip ospf int s0.1
> Serial0.1 is up, line protocol is up
> Internet Address 172.16.1.4/24, Area 0
> Process ID 1, Router ID 4.5.5.5, Network Type POINT_TO_POINT, Cost: 64
> Transmit Delay is 1 sec, State POINT_TO_POINT,
> Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
> Hello due in 00:00:08
> Index 4/4, 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 1, Adjacent neighbor count is 1
> Adjacent with neighbor 2.2.2.2
> Suppress hello for 0 neighbor(s)
>
> R4#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
>
> 4.0.0.0/24 is subnetted, 3 subnets
> C 4.5.5.0 is directly connected, Loopback2
> C 4.3.3.0 is directly connected, Loopback1
> C 4.4.4.0 is directly connected, Loopback0
> 172.16.0.0/24 is subnetted, 1 subnets
> C 172.16.1.0 is directly connected, Serial0.1
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> Paul L. Adams
> Callisma
> Phone: 571-633-9784
> Email: paul.adams@callisma.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> Building your network of the future. Today.
>
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