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List: zebra
Subject: [zebra 11018] Re: First Time to ospf (Long mail)
From: John Fraizer <zebra () EnterZone ! Net>
Date: 2001-10-31 8:07:03
[Download RAW message or body]
Um, it is the SAME path length from your station to RTR-C eth2 (as far as
OSPF is concerned) via both directions. Remember, we're talking about a
connected /24 interface here, not a /32. You're pinging a /32 but, as far
as the IGP is concerned, it's simply part of the /24 and that /24 lives as
a connected interface on both RTR-B and RTR-C.
OSPF is doing exactly what it should do.
---
John Fraizer
EnterZone, Inc
On 30 Oct 2001 bino@indoakses-online.com wrote:
> Dear All.
>
> On Tue, 30 October 2001, Stephane Bortzmeyer wrote:
>
> > Everything seems perfectly normal. Could you indicate as well what the
> > problem is (you told us in your first message but you apparently
> > changed the setup, this one is not the one described in your drawing).
>
> My-Station
> |
> RTR-B ----RTR-A ------RTR-C
> | |
> +--------------------+
>
>
> RTR-A :
> Eth 0 : 10.1.1.254/24 (point-to-point to Rtr-B)
> eth 1 : 192.168.1.254/24 (point-to-point to Rtr-C)
> eth2 : ignored
>
> RTR-B :
> eth0 : 10.1.1.1/24 ( To Rtr - A)
> eth1 : 172.17.1.254 /24 ( To Rtr - C)
>
> RTR - C :
> Eth 0 : 192.168.1.1/24 (To Rtr-A)
> Eth 1 : 172.17.1.1/24 (To RTR-B)
>
> Problem :
>
> >From RTR-A :
> Every time I Ping 172.1.1.1 (Eth1 of RTR-C), the packets always trowed trough rtr-B.
> We all knew that the shortest path is via 192.168.1.1 (eth0 of rtr-C)
>
> >From RTR-C :
> Every time I Ping 10.1.1.1 (Eth0 of RTR-B), the packets always trowed trough rtr-A.
> We all knew that the shortest path is via 172.17.1.254 (eth1 of rtr-B)
>
> Sincerely
> -bino-
>
>
>
> ----------------------- BEGIN Of RTR-A -----------------------------
>
> RTR-A# ip route
> 192.168.0.0/28 dev eth2 proto kernel scope link src 192.168.0.8
> 192.168.1.0/24 dev eth1 proto kernel scope link src 192.168.1.254
> 10.1.1.0/24 dev eth0 proto kernel scope link src 10.1.1.254
> 172.17.1.0/24 via 10.1.1.1 dev eth0 proto zebra metric 20
> RTR-A# telnet 127.0.0.1 2604
> Trying 127.0.0.1...
> Connected to 127.0.0.1.
> Escape character is '^]'.
>
> Hello, this is zebra (version 0.91a).
> Copyright 1996-2001 Kunihiro Ishiguro.
>
>
> User Access Verification
>
> Password:
> ospfd-a> ena
> ospfd-a# sh run
>
> Current configuration:
> !
> hostname ospfd-a
> password zebra
> log stdout
> !
> !
> !
> interface lo
> !
> interface eth0
> ip ospf network point-to-point
> !
> interface eth1
> ip ospf network point-to-point
> !
> interface eth2
> !
> router ospf
> ospf router-id 10.1.1.254
> redistribute kernel
> redistribute connected
> redistribute static
> network 10.1.1.0/24 area 0
> network 192.168.1.0/24 area 0
> neighbor 10.1.1.1
> neighbor 192.168.1.1
> !
> line vty
> !
> end
>
> ospfd-a# sh ip ospf route
> ============ OSPF network routing table ============
> N 10.1.1.0/24 [10] area: 0.0.0.0
> directly attached to eth0
> N IA 172.17.1.0/24 [20] area: 0.0.0.0
> via 10.1.1.1, eth0
> via 192.168.1.1, eth1
> N 192.168.1.0/24 [10] area: 0.0.0.0
> directly attached to eth1
>
> ============ OSPF router routing table =============
> R 10.1.1.1 [10] area: 0.0.0.0, ABR, ASBR
> via 10.1.1.1, eth0
> R 192.168.1.1 [10] area: 0.0.0.0, ABR, ASBR
> via 192.168.1.1, eth1
>
> ============ OSPF external routing table ===========
>
> ospfd-a# sh ip ospf data
>
> OSPF Router with ID (10.1.1.254)
>
> Router Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Link count
> 10.1.1.1 10.1.1.1 182 0x80000009 0xae39 2
> 10.1.1.254 10.1.1.254 178 0x80000007 0xd3a9 4
> 192.168.1.1 192.168.1.1 184 0x80000004 0x4a29 2
>
> Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Route
> 172.17.1.0 10.1.1.1 296 0x80000001 0xc3c3 172.17.1.0/24
> 172.17.1.0 192.168.1.1 435 0x80000001 0x1a0f 172.17.1.0/24
>
> ASBR-Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum
> 10.1.1.1 192.168.1.1 194 0x80000001 0x05d4
> 192.168.1.1 10.1.1.1 276 0x80000001 0x8b4e
>
> AS External Link States
>
> Link ID ADV Router Age Seq# CkSum Route
> 192.168.0.0 10.1.1.254 190 0x80000001 0x3c1d E2 192.168.0.0/28 [0x0]
>
>
> ospfd-a# sh ip ospf neigh
>
> Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL
> 10.1.1.1 1 Full/DROther 00:00:37 10.1.1.1 eth0 0 0 0
> 192.168.1.1 1 Full/DROther 00:00:36 192.168.1.1 eth1 0 0 0
> ospfd-a# exit
>
> ------------------------BEGIN OF RTR-B-----------------------------------------------
> RTR-B# telnet 127.0.0.1 2604
> Trying 127.0.0.1...
> Connected to 127.0.0.1.
> Escape character is '^]'.
>
> Hello, this is zebra (version 0.91a).
> Copyright 1996-2001 Kunihiro Ishiguro.
>
>
> User Access Verification
>
> Password:
> ospfd-b> ena
> ospfd-b# sh run
>
> Current configuration:
> !
> hostname ospfd-b
> password zebra
> log stdout
> !
> !
> !
> interface lo
> !
> interface eth0
> ip ospf network point-to-point
> !
> interface eth1
> ip ospf network point-to-point
> !
> router ospf
> ospf router-id 10.1.1.1
> redistribute kernel
> redistribute connected
> redistribute static
> network 10.1.1.0/24 area 0
> network 172.17.1.0/24 area 1
> neighbor 10.1.1.254
> neighbor 172.17.1.1
> !
> line vty
> !
> end
> ospfd-b# sh ip ospf data
>
> OSPF Router with ID (10.1.1.1)
>
> Router Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Link count
> 10.1.1.1 10.1.1.1 275 0x80000009 0xae39 2
> 10.1.1.254 10.1.1.254 272 0x80000007 0xd3a9 4
> 192.168.1.1 192.168.1.1 278 0x80000004 0x4a29 2
>
> Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Route
> 172.17.1.0 10.1.1.1 305 0x80000001 0xc3c3 172.17.1.0/24
> 172.17.1.0 192.168.1.1 529 0x80000001 0x1a0f 172.17.1.0/24
>
> ASBR-Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum
> 10.1.1.1 192.168.1.1 288 0x80000001 0x05d4
> 192.168.1.1 10.1.1.1 368 0x80000001 0x8b4e
>
> Router Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum Link count
> 10.1.1.1 10.1.1.1 296 0x80000003 0xff2a 2
> 192.168.1.1 192.168.1.1 297 0x80000004 0x11b7 2
>
> Summary Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum Route
> 10.1.1.0 10.1.1.1 305 0x80000001 0xc673 10.1.1.0/24
> 10.1.1.0 192.168.1.1 267 0x80000001 0x8150 10.1.1.0/24
> 192.168.1.0 10.1.1.1 261 0x80000001 0x08c9 192.168.1.0/24
> 192.168.1.0 192.168.1.1 977 0x80000001 0xf983 192.168.1.0/24
>
> ASBR-Summary Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum
> 10.1.1.1 10.1.1.1 261 0x80000001 0x77ac
> 10.1.1.254 10.1.1.1 261 0x80000001 0xc277
> 10.1.1.254 192.168.1.1 267 0x80000001 0x19c2
> 192.168.1.1 192.168.1.1 257 0x80000001 0xaabc
>
> AS External Link States
>
> Link ID ADV Router Age Seq# CkSum Route
> 192.168.0.0 10.1.1.254 1051 0x80000001 0x3c1d E2 192.168.0.0/28 [0x0]
>
>
> ospfd-b# sh ip ospf route
> ============ OSPF network routing table ============
> N 10.1.1.0/24 [10] area: 0.0.0.0
> directly attached to eth0
> N 172.17.1.0/24 [10] area: 0.0.0.1
> directly attached to eth1
> N 192.168.1.0/24 [20] area: 0.0.0.0
> via 10.1.1.254, eth0
>
> ============ OSPF router routing table =============
> R 10.1.1.1 IA [30] area: 0.0.0.0, ASBR
> via 10.1.1.254, eth0
> R 10.1.1.254 [10] area: 0.0.0.0, ASBR
> via 10.1.1.254, eth0
> R 192.168.1.1 [20] area: 0.0.0.0, ABR, ASBR
> via 10.1.1.254, eth0
> [10] area: 0.0.0.1, ABR, ASBR
> via 172.17.1.1, eth1
>
> ============ OSPF external routing table ===========
> N E2 192.168.0.0/28 [10/20] tag: 0
> via 10.1.1.254, eth0
>
> ospfd-b# sh ip ospf neigh
>
> Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL
> 10.1.1.254 1 Full/DROther 00:00:35 10.1.1.254 eth0 0 0 0
> 192.168.1.1 1 Full/DROther 00:00:38 172.17.1.1 eth1 0 0 0
> ospfd-b# exit
>
> RTR-B# ip route
> 192.168.0.0/28 via 10.1.1.254 dev eth0 proto zebra metric 10
> 192.168.1.0/24 via 10.1.1.254 dev eth0 proto zebra metric 20
> 10.1.1.0/24 dev eth0 proto kernel scope link src 10.1.1.1
> 172.17.1.0/24 dev eth1 proto kernel scope link src 172.17.1.254
>
> -----------------------BEGIN of RTR-C --------------------------------------
> RTR-C# ip route
> 192.168.0.0/28 via 192.168.1.254 dev eth0 proto zebra metric 10
> 192.168.1.0/24 dev eth0 proto kernel scope link src 192.168.1.1
> 10.1.1.0/24 via 192.168.1.254 dev eth0 proto zebra metric 20
> 172.17.1.0/24 dev eth1 proto kernel scope link src 172.17.1.1
> Hello, this is zebra (version 0.91a).
> Copyright 1996-2001 Kunihiro Ishiguro.
>
>
> User Access Verification
>
> Password:
> ospfd-c>ena
> ospfd-c# sh run
>
> Current configuration:
> !
> hostname ospfd-c
> password zebra
> log stdout
> !
> !
> !
> interface lo
> !
> interface eth0
> ip ospf network point-to-point
> !
> interface eth1
> ip ospf network point-to-point
> !
> router ospf
> ospf router-id 192.168.1.1
> redistribute kernel
> redistribute connected
> redistribute static
> network 172.17.1.0/24 area 1
> network 192.168.1.0/24 area 0
> neighbor 172.17.1.254
> neighbor 192.168.1.254
> !
> line vty
> !
> end
> ospfd-c# sh ip ospf data
>
> OSPF Router with ID (192.168.1.1)
>
> Router Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Link count
> 10.1.1.1 10.1.1.1 444 0x80000009 0xae39 2
> 10.1.1.254 10.1.1.254 440 0x80000007 0xd3a9 4
> 192.168.1.1 192.168.1.1 444 0x80000004 0x4a29 2
>
> Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum Route
> 172.17.1.0 10.1.1.1 557 0x80000001 0xc3c3 172.17.1.0/24
> 172.17.1.0 192.168.1.1 696 0x80000001 0x1a0f 172.17.1.0/24
>
> ASBR-Summary Link States (Area 0.0.0.0)
>
> Link ID ADV Router Age Seq# CkSum
> 10.1.1.1 192.168.1.1 454 0x80000001 0x05d4
> 192.168.1.1 10.1.1.1 537 0x80000001 0x8b4e
>
> Router Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum Link count
> 10.1.1.1 10.1.1.1 465 0x80000003 0xff2a 2
> 192.168.1.1 192.168.1.1 464 0x80000004 0x11b7 2
>
> Summary Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum Route
> 10.1.1.0 10.1.1.1 556 0x80000001 0xc673 10.1.1.0/24
> 10.1.1.0 192.168.1.1 434 0x80000001 0x8150 10.1.1.0/24
> 192.168.1.0 10.1.1.1 430 0x80000001 0x08c9 192.168.1.0/24
> 192.168.1.0 192.168.1.1 1145 0x80000001 0xf983 192.168.1.0/24
>
> ASBR-Summary Link States (Area 0.0.0.1)
>
> Link ID ADV Router Age Seq# CkSum
> 10.1.1.1 10.1.1.1 430 0x80000001 0x77ac
> 10.1.1.254 10.1.1.1 430 0x80000001 0xc277
> 10.1.1.254 192.168.1.1 434 0x80000001 0x19c2
> 192.168.1.1 192.168.1.1 424 0x80000001 0xaabc
>
> AS External Link States
> Link ID ADV Router Age Seq# CkSum Route
> 192.168.0.0 10.1.1.254 1219 0x80000001 0x3c1d E2 192.168.0.0/28 [0x0]
>
>
> ospfd-c# sh ip ospf route
> ============ OSPF network routing table ============
> N 10.1.1.0/24 [20] area: 0.0.0.0
> via 192.168.1.254, eth0
> N 172.17.1.0/24 [10] area: 0.0.0.1
> directly attached to eth1
> N 192.168.1.0/24 [10] area: 0.0.0.0
> directly attached to eth0
>
> ============ OSPF router routing table =============
> R 10.1.1.1 [20] area: 0.0.0.0, ABR, ASBR
> via 192.168.1.254, eth0
> [10] area: 0.0.0.1, ABR, ASBR
> via 172.17.1.254, eth1
> R 10.1.1.254 [10] area: 0.0.0.0, ASBR
> via 192.168.1.254, eth0
> R 192.168.1.1 IA [30] area: 0.0.0.0, ASBR
> via 192.168.1.254, eth0
>
> ============ OSPF external routing table ===========
> N E2 192.168.0.0/28 [10/20] tag: 0
> via 192.168.1.254, eth0
>
> ospfd-c# sh ip ospf neigh
>
> Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL
> 10.1.1.254 1 Full/DROther 00:00:30 192.168.1.254 eth0 0 0 0
> 10.1.1.1 1 Full/DROther 00:00:35 172.17.1.254 eth1 0 0 0
>
>
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