OSPF Network Type (In)Compatabilities [7:36781]
Hello, Are P-t-P and P-t-M the only compatible pair of ospf network types (besides a type to itself)? I'm getting P-t-M and N_B network types to see each other as neighbors, but never exchange tables. Is it possible to get P-t-M and N_B networks to exchange tables? I've tried using the ip ospf network point-to-multipoint nonbroadcast and specifying neighbors under the router ospf configuration, but that didn't work. Seems to me N_B is only compatible with N_B...? Kind Regards, Tim Booth MCDBA, CCNP, CCDP, CCIE written - Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, 1759 Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36781t=36781 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: OSPF Network Type (In)Compatabilities [7:36781]
Tim, I have also been looking into this. As far as I know this is definate -you cannot have a the following: Hub - ip ospf network point-to-multipoint and spokes - ip ospf network broadcast ( Or the other way around ) due to a mismatch in the hello packets ala 3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8 3d00h: OSPF: Mismatched hello parameters from 10.128.10.8 3d00h: Dead R 120 C 40, Hello R 30 C 10 Mask R 255.255.255.0 C 255.255.255.0 3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8 3d00h: OSPF: Mismatched hello parameters from 10.128.10.8 Also remember that: ip ospf network broadcast gives subnet routes and DR/BDR ala r2#sh ip os ne r2#sh ip os neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.1 1 FULL/DR 00:00:3310.128.10.8 Serial0/0 r2#sh ip route 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, 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 10.0.0.0/24 is subnetted, 1 subnets C 10.128.10.0 is directly connected, Serial0/0 -- Note subnet r2# ip ospf network point-to-multipoint gives host routes ,neighbours and no DR/BDR ala r2#sh ip os ne r2#sh ip os neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.1 1 FULL/ -00:01:4210.128.10.8 Serial0/0 r2#sh ip route 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, 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 10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks C 10.128.10.0/24 is directly connected, Serial0/0 O 10.128.10.3/32 [110/128] via 10.128.10.8, 00:01:09, Serial0/0 O 10.128.10.8/32 [110/64] via 10.128.10.8, 00:01:09, Serial0/0 ^ Note host routes | Hope this helps Rich Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36808t=36781 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Network Type (In)Compatabilities [7:36781]
No matter what type of network you chose for a subnet, all OSPF routers attached to it must agree on its type. They will refuse to operate at all on that subnet. Also, the router will respond with warning messages about mis-matching network types. Daniel Ladrach CCNA, CCNP WorldCom -Original Message- From: Richard Botham [mailto:[EMAIL PROTECTED]] Sent: Thursday, February 28, 2002 11:06 AM To: [EMAIL PROTECTED] Subject: Re: OSPF Network Type (In)Compatabilities [7:36781] Tim, I have also been looking into this. As far as I know this is definate -you cannot have a the following: Hub - ip ospf network point-to-multipoint and spokes - ip ospf network broadcast ( Or the other way around ) due to a mismatch in the hello packets ala 3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8 3d00h: OSPF: Mismatched hello parameters from 10.128.10.8 3d00h: Dead R 120 C 40, Hello R 30 C 10 Mask R 255.255.255.0 C 255.255.255.0 3d00h: OSPF: Rcv hello from 192.168.1.1 area 1 from Serial0/0 10.128.10.8 3d00h: OSPF: Mismatched hello parameters from 10.128.10.8 Also remember that: ip ospf network broadcast gives subnet routes and DR/BDR ala r2#sh ip os ne r2#sh ip os neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.1 1 FULL/DR 00:00:3310.128.10.8 Serial0/0 r2#sh ip route 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, 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 10.0.0.0/24 is subnetted, 1 subnets C 10.128.10.0 is directly connected, Serial0/0 -- Note subnet r2# ip ospf network point-to-multipoint gives host routes ,neighbours and no DR/BDR ala r2#sh ip os ne r2#sh ip os neighbor Neighbor ID Pri State Dead Time Address Interface 192.168.1.1 1 FULL/ -00:01:4210.128.10.8 Serial0/0 r2#sh ip route 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, 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 10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks C 10.128.10.0/24 is directly connected, Serial0/0 O 10.128.10.3/32 [110/128] via 10.128.10.8, 00:01:09, Serial0/0 O 10.128.10.8/32 [110/64] via 10.128.10.8, 00:01:09, Serial0/0 ^ Note host routes | Hope this helps Rich Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36816t=36781 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: OSPF Network Type (In)Compatabilities [7:36781]
You could just use the ip ospf hello-interval to fix hello inconsistancies. I don't think that point-to-point or multipoint mismatches will cause issues just hello mismatches. You could also use the ip ospf priority 0 command on all interfaces of the router from preventing DR/BDR elections on that router. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=36923t=36781 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
