Can you explain why you thought it initially wouldn't work? Since the
area 0 in the middle with other areas around it is exactly how OSPF is
designed in the first place :-)
-- Regards, Rick Mur CCIE2 #21946 (R&S / Service Provider) Sr. Support Engineer IPexpert, Inc. URL: http://www.IPexpert.com On 5 sep 2009, at 15:28, Molomo wrote: > Andy, > > We labbed it, it actually does work... it means they are different > areas > then. > > Thanks Andy... > > > > > On Sat, Sep 5, 2009 at 2:22 PM, Andy Reid <ccie_at_reid.it> wrote: > >> Hi Molomo, >> >> Yes that will work just fine. >> You can lab it yourself with just 3 routers: >> >> R2----area 1---R5---area 0 (loopback 0)---area 1-----R4 >> >> I took a break out of the exciting world of multicast to lab it >> myself: >> >> R2: >> interface Loopback0 >> ip address 2.2.2.2 255.0.0.0 >> ! >> interface Serial0/0 >> no ip address >> encapsulation frame-relay >> no dce-terminal-timing-enable >> ! >> interface Serial0/0.25 point-to-point >> ip address 10.1.25.2 255.255.255.0 >> ip pim sparse-mode >> frame-relay interface-dlci 205 >> ! >> router ospf 1 >> log-adjacency-changes >> network 0.0.0.0 255.255.255.255 area 1 >> end >> >> R5: >> interface Loopback0 >> ip address 5.5.5.5 255.0.0.0 >> ! >> interface Serial0/0 >> no ip address >> encapsulation frame-relay >> ! >> interface Serial0/0.52 point-to-point >> ip address 10.1.25.5 255.255.255.0 >> ip pim sparse-mode >> frame-relay interface-dlci 502 ! >> ! >> interface Serial0/0.54 point-to-point >> ip address 10.1.45.5 255.255.255.0 >> ip pim sparse-mode >> frame-relay interface-dlci 504 ! >> router ospf 1 >> log-adjacency-changes >> network 5.5.5.5 0.0.0.0 area 0 >> network 10.0.0.0 0.255.255.255 area 1 >> end >> >> R4: >> interface Loopback0 >> ip address 4.4.4.4 255.0.0.0 >> ! >> interface Serial0/0 >> no ip address >> encapsulation frame-relay >> no dce-terminal-timing-enable >> ! >> interface Serial0/0.45 point-to-point >> ip address 10.1.45.4 255.255.255.0 >> ip pim sparse-mode >> frame-relay interface-dlci 405 ! >> router ospf 1 >> log-adjacency-changes >> network 0.0.0.0 255.255.255.255 area 1 >> end >> >> The end result is area 0 on a stick :) >> >> R5#show ip os ne >> Neighbor ID Pri State Dead Time Address >> Interface >> 4.4.4.4 0 FULL/ - 00:00:32 10.1.45.4 >> Serial0/0.54 >> 2.2.2.2 0 FULL/ - 00:00:37 10.1.25.2 >> Serial0/0.52 >> >> R5#show ip route ospf >> 2.0.0.0/32 is subnetted, 1 subnets >> O 2.2.2.2 [110/65] via 10.1.25.2, 00:07:09, Serial0/0.52 >> 4.0.0.0/32 is subnetted, 1 subnets >> O 4.4.4.4 [110/65] via 10.1.45.4, 00:07:09, Serial0/0.54 >> >> >> R2#show ip route ospf >> 4.0.0.0/32 is subnetted, 1 subnets >> O 4.4.4.4 [110/129] via 10.1.25.5, 00:07:38, Serial0/0.25 >> 5.0.0.0/32 is subnetted, 1 subnets >> O IA 5.5.5.5 [110/65] via 10.1.25.5, 00:07:38, Serial0/0.25 >> 10.0.0.0/24 is subnetted, 2 subnets >> O 10.1.45.0 [110/128] via 10.1.25.5, 00:07:38, Serial0/0.25 >> >> R2#ping 4.4.4.4 >> Type escape sequence to abort. >> Sending 5, 100-byte ICMP Echos to 4.4.4.4, timeout is 2 seconds: >> !!!!! >> Success rate is 100 percent (5/5), round-trip min/avg/max = >> 112/127/176 ms >> >> R4#show ip route ospf >> 2.0.0.0/32 is subnetted, 1 subnets >> O 2.2.2.2 [110/129] via 10.1.45.5, 00:08:18, Serial0/0.45 >> 5.0.0.0/32 is subnetted, 1 subnets >> O IA 5.5.5.5 [110/65] via 10.1.45.5, 00:08:18, Serial0/0.45 >> 10.0.0.0/24 is subnetted, 2 subnets >> O 10.1.25.0 [110/128] via 10.1.45.5, 00:08:18, Serial0/0.45 >> >> Also check out this Cisco link: >> http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml >> >> regards Andy >> >> >> Molomo wrote: >> >>> Experts, >>> >>> I would like to know if the setup below is valid, and whether R1 & >>> R4 will >>> be able to reach each other. >>> >>> >>> R1---area 1-----R2---area 0-----R3----area 1-----R4 >>> >>> >>> Regards, >>> Molomo >>> >>> >>> Blogs and organic groups at http://www.ccie.net >>> >>> _______________________________________________________________________ >>> Subscription information may be found at: >>> http://www.groupstudy.com/list/CCIELab.html > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html Blogs and organic groups at http://www.ccie.netReceived on Sat Sep 05 2009 - 17:44:18 ART
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