From: Michael Snyder (msnyder@xxxxxxx)
Date: Mon May 27 2002 - 03:04:38 GMT-3
And the Tunnel Interface has what subnet in common? They are on
different Class A networks. I mean ospf has problems with discontinuous
sub networks, never mind two different Class A networks. How would that
hello packet work?
-----Original Message-----
From: mize [mailto:mize@netbuddy.org]
Sent: Monday, May 27, 2002 12:46 AM
To: Michael Snyder
Cc: ccielab@groupstudy.com
Subject: Re: This one will make your head hurt.
Wonderful scenario but the reason is simple - OSPF in running on Tunnel
0 interface.
$B!!!!(B
>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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