From: Chen Kwong Wai William (kwchen@netvigator.com)
Date: Fri Oct 10 2003 - 22:47:45 GMT-3
Hi Hunt,
Is the 3550 the DR of the Broadcast LAN?
Best Regards,
William Chen
----- Original Message -----
From: "Hunt Lee" <hunt_lee@bigpond.net.au>
To: <ccielab@groupstudy.com>
Sent: Thursday, October 09, 2003 8:50 PM
Subject: OPSF big mess!!!
> Hello Group,
>
> I have a very strange scenario.
>
> I always configured the OSPF distance command by Router ID... but I got
stuck on this today.
>
> R1 R2
> | |
> -------------------------------
> |
> 3550
>
> So they all connected to Ethernet.
>
> Now on R1 routing table
>
> O IA 139.10.45.0/24 [110/75] via 139.10.120.2, 00:00:12, Ethernet0.120
> O IA 139.10.52.0/24 [110/1572] via 139.10.120.2, 00:00:12,
Ethernet0.120
> O IA 139.10.65.0/24 [110/138] via 139.10.120.2, 00:00:12, Ethernet0.120
> O E2 139.10.67.0/24 [110/20] via 139.10.120.2, 00:00:12, Ethernet0.120
> O E2 139.10.69.0/24 [110/20] via 139.10.120.2, 00:00:12, Ethernet0.120
> O E2 139.10.87.0/24 [110/20] via 139.10.120.2, 00:00:12, Ethernet0.120
> O E2 139.10.89.0/24 [110/20] via 139.10.120.2, 00:00:12, Ethernet0.120
>
> Say I wanted to change the distance of 139.10.87.0/24 from 110 to 130
>
> Now. 139.10.120.2 is eth IP of R2, and R2's Router ID is 139.10.2.2 (as
below)
>
> r2#sh ip int brief
> Interface IP-Address OK? Method Status
Protocol
> BRI0 139.10.52.2 YES NVRAM up
up
> BRI0:1 unassigned YES unset down
down
> BRI0:2 unassigned YES unset down
down
> Ethernet0 139.10.120.2 YES NVRAM up
up
> Loopback0 139.10.2.2 YES NVRAM up
up
> Serial0 139.10.100.2 YES NVRAM up
up
> Serial1 unassigned YES NVRAM administratively
down down
> Virtual-Access1 unassigned YES TFTP down
down
> r2#sh ip ospf
> Routing Process "ospf 1" with ID 139.10.2.2
> Supports only single TOS(TOS0) routes
> Supports opaque LSA
> It is an area border router
>
> Now R1(config)#access-list 5 permit 139.10.87.0 0.0.0.255
>
> and
>
> R1(config-router)#distance 130 139.10.2.2 0.0.0.0 5
>
> R1#clear ip ospf process
> Reset ALL OSPF processes? [no]: yes
> R1#
>
> Looking back into the routing table, nothing happened
>
> O E2 139.10.20.0/24 [110/20] via 139.10.120.2, 00:00:18, Ethernet0.120
> O IA 139.10.45.0/24 [110/75] via 139.10.120.2, 00:00:18, Ethernet0.120
> O IA 139.10.52.0/24 [110/1572] via 139.10.120.2, 00:00:18,
Ethernet0.120
> O IA 139.10.65.0/24 [110/138] via 139.10.120.2, 00:00:18, Ethernet0.120
> O E2 139.10.67.0/24 [110/20] via 139.10.120.2, 00:00:18, Ethernet0.120
> O E2 139.10.69.0/24 [110/20] via 139.10.120.2, 00:00:18, Ethernet0.120
> O E2 139.10.87.0/24 [110/20] via 139.10.120.2, 00:00:18, Ethernet0.120
>
> But when I look at that route closer
>
> R1#sh ip route 139.10.87.0
> Routing entry for 139.10.87.0/24
> Known via "ospf 1", distance 110, metric 20, type extern 2, forward
metric 75
> Redistributing via eigrp 100
> Advertised by eigrp 100
> Last update from 139.10.120.2 on via Ethernet0.120.120, 00:00:43 ago
> Routing Descriptor Blocks:
> * 139.10.120.2, from 139.10.10.1, 00:00:43 ago, via Ethernet0.120
> Route metric is 20, traffic share count is 1
>
> R1#
>
> It said from "139.10.10.1", which is the IP of Loopback (router id) of my
3550
>
>
> Loopback0 139.10.10.1 YES manual up
up
> Switch1#
>
> Switch1#sh ip ospf
> Routing Process "ospf 1" with ID 139.10.10.1
> Supports only single TOS(TOS0) routes
> Supports opaque LSA
>
> And this time, i applied distance on that 3550's Router ID (139.10.10.1)
and it work
>
> So my question is, where is the main routing table telling me something
different?
>
> And what is the * 139.10.120.2 from 139.10.120.10 mean?
>
> * 139.10.120.2, from 139.10.120.10, 00:00:43 ago, via Ethernet0.120
> Route metric is 20, traffic share count is 1
>
> ANd should I just always just use the IP by the "from field" to work out
the OSPF router ID, rather than the one from main routing table? (which is
what I have been doing)
>
> And I don't even understand why the router id would suddenly jump to 3550,
rather than R2!!!
>
> Any help would be greatly appreciated.
> Hunt
>
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This archive was generated by hypermail 2.1.4 : Mon Nov 24 2003 - 07:53:00 GMT-3