From: Hunt Lee (ciscoforme3@xxxxxxxxxxxx)
Date: Tue Aug 20 2002 - 10:30:00 GMT-3
Good morning,
Before leaving my place this morning I had some spare time to play
around w/some OSPF Virtual Link Authentication and found something
interesting. This has probably been posted before, I might be the
last to know about it, or I'm just flat out wrong and wasn't awake
enough while I was playing.
Anyway, I want to configure 'area 0 authentication' & 'area 1
virtual-link x.x.x.x authentication-key cisco' on both router A &
router C and decided to verify if the configs for OSPF Virtual-Link
Authentication configuration on CCO was true.
http://www.cisco.com/warp/public/104/27.html
When I set up my configs as you see below I verified that both of
those commands are correct, with one problem though. What I have
found is that CCO has an extra command on Router A's Ethernet
interface 'ip ospf authentication-key cisco', yet I couldn't
understand what it is for. With or without this command, my Virtual
Link (between Router A & Router C) still works.
And the same thing happens on the MD5 config, where CCO puts a 'ip
opsf message-digest-key 1 md5 cisco' on Router A's Ethernet
interface.
So tell me, is CCO wrong? Did I mis-configure something?
Here is the partial diagram:
----- ------- ------
| | | | | |
| A | ------- | B | ------------ | C |
| |10.1.1.0/30 | | 10.1.2.0/30 | |
----- ------- ------
| |
-------- -------
100.0.0.1/24 120.0.0.0/24
Router A
---------
router ospf 1
router-id 1.1.1.1
log-adjacency-changes
area 0 authentication
area 1 virtual-link 3.3.3.3 authentication-key test
network 10.1.1.0 0.0.0.3 area 1
network 100.0.0.0 0.255.255.255 area 0
interface Ethernet0
ip address 100.0.0.1 255.255.255.0
ip ospf authentication-key cisco
Router C
---------
router ospf 3
router-id 3.3.3.3
log-adjacency-changes
area 0 authentication
area 1 virtual-link 1.1.1.1 authentication-key test
network 10.1.2.0 0.0.0.3 area 1
network 120.0.0.0 0.255.255.255 area 2
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