From: mize (mize@xxxxxxxxxxxx)
Date: Mon May 27 2002 - 02:53:38 GMT-3
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>From mize@netbuddy.org Mon May 27 01:46:15 2002
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>Date: Mon, 27 May 2002 13:46:18 +0800
>From: "mize" <mize@netbuddy.org>
>To: Michael Snyder <msnyder@ldd.net>
>CC: "ccielab@groupstudy.com" <ccielab@groupstudy.com>
>Subject: Re: This one will make your head hurt.
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>Wonderful scenario but the reason is simple - OSPF in running on Tunnel 0 inte
rface.
>
>!!!!
>>I'll let you figure it out. First take note that I can ping networks
>>1.1.1.1 and 3.3.3.3. Second notice that ospf has no subnets or
>>neighbors in common. None! Yet a full ospf database.
>>
>>
>>A#show run
>>Building configuration...
>>!
>>hostname A
>>!
>>interface Loopback0
>> ip address 1.1.1.1 255.255.255.0
>> ip ospf network point-to-point
>>!
>>interface Loopback1
>> ip address 2.2.2.2 255.255.255.0
>> ip ospf network point-to-point
>>!
>>interface Tunnel0
>> ip unnumbered Loopback1
>> tunnel source Loopback1
>> tunnel destination 4.4.4.4
>>!
>>interface Serial1
>> ip address 10.0.0.1 255.255.255.252
>> clockrate 56000
>>!
>>router ospf 80
>> log-adjacency-changes
>> network 1.1.1.0 0.0.0.255 area 1
>> network 2.2.2.0 0.0.0.255 area 0
>>!
>>ip route 4.4.4.0 255.255.255.0 Serial1
>>
>>A#si
>>
>>Gateway of last resort is not set
>>
>> 1.0.0.0/24 is subnetted, 1 subnets
>>C 1.1.1.0 is directly connected, Loopback0
>> 2.0.0.0/24 is subnetted, 1 subnets
>>C 2.2.2.0 is directly connected, Loopback1
>> 3.0.0.0/24 is subnetted, 1 subnets
>>O IA 3.3.3.0 [110/11112] via 4.4.4.4, 00:07:13, Tunnel0
>> 4.0.0.0/24 is subnetted, 1 subnets
>>S 4.4.4.0 is directly connected, Serial1
>> 10.0.0.0/30 is subnetted, 1 subnets
>>C 10.0.0.0 is directly connected, Serial1
>>A#p 3.3.3.3
>>
>>Type escape sequence to abort.
>>Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:
>>!!!!!
>>Success rate is 100 percent (5/5), round-trip min/avg/max = 40/40/40 ms
>>A#show ip ospf n
>>
>>Neighbor ID Pri State Dead Time Address
>>Interface
>>4.4.4.4 1 FULL/ - 00:00:38 4.4.4.4
>>Tunnel0
>>A#show ip ospf d
>>
>> OSPF Router with ID (2.2.2.2) (Process ID 80)
>>
>>
>> Router Link States (Area 0)
>>
>>Link ID ADV Router Age Seq# Checksum Link
>>count
>>2.2.2.2 2.2.2.2 459 0x80000015 0xC28B 2
>>4.4.4.4 4.4.4.4 460 0x80000002 0x2A26 2
>>
>> Summary Net Link States (Area 0)
>>
>>Link ID ADV Router Age Seq# Checksum
>>1.1.1.0 2.2.2.2 496 0x80000001 0x33FD
>>3.3.3.0 4.4.4.4 455 0x80000002 0xAC75
>>
>> Router Link States (Area 1)
>>
>>Link ID ADV Router Age Seq# Checksum Link
>>count
>>2.2.2.2 2.2.2.2 233 0x80000004 0x77A3 1
>>
>> Summary Net Link States (Area 1)
>>
>>Link ID ADV Router Age Seq# Checksum
>>2.2.2.0 2.2.2.2 791 0x80000001 0xF1F
>>3.3.3.0 2.2.2.2 455 0x80000001 0x791F
>>4.4.4.0 2.2.2.2 455 0x80000001 0x5540
>>A#
>>
>>
>>
>>
>>
>>C#show run
>>Building configuration...
>>!
>>hostname C
>>!
>>!
>>!
>>interface Loopback0
>> ip address 3.3.3.3 255.255.255.0
>> ip ospf network point-to-point
>>!
>>interface Loopback1
>> ip address 4.4.4.4 255.255.255.0
>> ip ospf network point-to-point
>>!
>>interface Tunnel0
>> ip unnumbered Loopback1
>> tunnel source Loopback1
>> tunnel destination 2.2.2.2
>>!
>>interface Ethernet0
>> no ip address
>>!
>>interface Serial1
>> ip address 10.0.0.2 255.255.255.252
>>!
>>router ospf 80
>> log-adjacency-changes
>> network 3.3.3.0 0.0.0.255 area 2
>> network 4.4.4.0 0.0.0.255 area 0
>>!
>>ip classless
>>ip route 2.2.2.0 255.255.255.0 Serial1
>>!
>>end
>>
>>C#show 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
>>
>> 1.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
>>O IA 1.1.1.0 [110/11112] via 2.2.2.2, 00:05:27, Tunnel0
>> 2.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
>>S 2.2.2.0 is directly connected, Serial1
>> 3.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
>>C 3.3.3.0 is directly connected, Loopback0
>> 4.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
>>C 4.4.4.0 is directly connected, Loopback1
>> 10.0.0.0 0xFFFFFFFC is subnetted, 1 subnets
>>C 10.0.0.0 is directly connected, Serial1
>>C#p 1.1.1.1
>>
>>Type escape sequence to abort.
>>Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
>>!!!!!
>>Success rate is 100 percent (5/5), round-trip min/avg/max = 44/50/64 ms
>>C#show ip ospf nei
>>
>>Neighbor ID Pri State Dead Time Address
>>Interface
>>2.2.2.2 1 FULL/ - 00:00:37 2.2.2.2
>>Tunnel0
>>C#show ip ospf data
>>
>> OSPF Router with ID (4.4.4.4) (Process ID 80)
>>
>>
>> Router Link States (Area 0)
>>
>>Link ID ADV Router Age Seq# Checksum Link
>>count
>>2.2.2.2 2.2.2.2 367 0x80000015 0xC28B 2
>>4.4.4.4 4.4.4.4 367 0x80000002 0x2A26 2
>>
>> Summary Net Link States (Area 0)
>>
>>Link ID ADV Router Age Seq# Checksum
>>1.1.1.0 2.2.2.2 404 0x80000001 0x33FD
>>3.3.3.0 4.4.4.4 362 0x80000002 0xAC75
>>
>> Router Link States (Area 2)
>>
>>Link ID ADV Router Age Seq# Checksum Link
>>count
>>4.4.4.4 4.4.4.4 376 0x80000001 0x15F2 1
>>
>> Summary Net Link States (Area 2)
>>
>>Link ID ADV Router Age Seq# Checksum
>>1.1.1.0 4.4.4.4 356 0x80000001 0x8511
>>2.2.2.0 4.4.4.4 358 0x80000001 0x6132
>>4.4.4.0 4.4.4.4 368 0x80000001 0x8A95
>>C#
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