From: Jaeheon Yoo (kghost@xxxxxxxxxxxx)
Date: Thu Mar 07 2002 - 20:39:13 GMT-3
Hi, Bob
Yes, I've just noticed this on 12.1(5)T10.
Well, I've searched the cisco web site thoroughly for this, but it seems to me
that they didn't mention a thing about it.
Well, they may think that it's better to keep it undocumented :(.
Maybe I'm missing a related link, and if someone out there have a related link
for this, let me know.
But instead this subject has been heavily discussed on the list.
http://www.groupstudy.com/archives/ccielab/200201/msg00468.html
Now I'm getting really frustrated.
This is a very important feature, but we still didn't know exactly when it newl
y changed its well-known behavior like Doyle Vol. 1 explained it on p.548.
At least , they should have documented this like the changed behavior of redist
ributed connected networks.
http://www.cisco.com/warp/public/104/redist-conn.html
Here's new behavior of area range command on 12.1(5)T10.
router ospf 1
router-id 150.201.1.1
log-adjacency-changes
area 0 authentication message-digest
area 0 range 150.201.0.0 255.255.240.0
area 1 authentication message-digest
area 1 range 150.201.0.0 255.255.128.0
area 1 virtual-link 150.201.4.4 message-digest-key 1 md5 cisco
network 150.201.1.0 0.0.0.255 area 0
network 150.201.12.0 0.0.0.3 area 0
network 150.201.14.0 0.0.0.255 area 1
!
Rack02R1#sh ip route
Gateway of last resort is not set
150.201.0.0/16 is variably subnetted, 9 subnets, 4 masks
O E2 150.201.24.0/24 [110/20] via 150.201.14.4, 00:00:49, Serial1
C 150.201.14.0/24 is directly connected, Serial1
O E2 150.201.12.0/24 [110/20] via 150.201.14.4, 00:00:49, Serial1
C 150.201.12.0/30 is directly connected, Serial0
O IA 150.201.4.0/24 [110/65] via 150.201.14.4, 00:00:49, Serial1
O 150.201.2.0/24 [110/65] via 150.201.12.2, 00:00:49, Serial0
C 150.201.1.0/24 is directly connected, Loopback0
O 150.201.0.0/17 is a summary, 00:00:50, Null0
O 150.201.0.0/20 is a summary, 00:00:50, Null0
Rack02R1#
Jaeheon
----- Original Message -----
From: "Bob Sinclair" <bsin@erols.com>
To: <ccielab@groupstudy.com>
Sent: Friday, March 08, 2002 12:30 AM
Subject: OSPF Summary Address Null0 route
> Folk:
>
> It seems to me the story has been that OSPF does not create a null0 route au
tomatically when you do an area range summary (only when you do a summary-addre
ss).
>
> However, I have noticed that it seems to depend on the IOS version. My route
r running 121-5 does not automatically make a summary route. But 12.1-11 and
12.1-5T9 both make a route to null0 automatically when I do an area range summ
ary.
>
> Wonder if others have noticed this and whether it is documented.
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