From: CCIE-Maillist (CCIE-Maillist@xxxxxxxxxx)
Date: Fri May 17 2002 - 20:44:37 GMT-3
Jeffery,
I do have an area 0 in my network. Router 5 is connected to it and router 6 is
connected to router 5 through area 5.
My problem was that router 6 in area 5 said that area 0 was inactive. I didn't
understand why that was or if that was a normal thing, especially as everything
seemed to work fine.
I believe what I learned is that if you have on your router any statements abou
t area 0 (like, in my case, "area 0 auth me" then it has a section for area 0 i
n the "sh ip b" output, even if you don't have any interfaces in area 0. Appare
ntly, this is a normal behavior
After I removed the "area 0 auth me" command on router 5 and reloaded it, the a
rea 0 section went away.
It took removing the command and reloading, as I have aldready done a "cle ip o
pro".
Thanks for all your help!
David
-----Original Message-----
From: Jeffery S Kimes [mailto:kimes@us.ibm.com]
Posted At: Friday, May 17, 2002 6:38 PM
Posted To: CCIE-Maillist
Conversation: RE: area 0 inactive - okay?
Subject: RE: RE: area 0 inactive - okay?
I would assume that it is correct. You don't have an area 0 in your
network do you? If not, then it would have to be inactive...
"CCIE-Maillist"
<CCIE-Maillist@fo To: Jeffery S Kimes/San Di
ego/IBM@IBMUS
xgal.com> cc:
Subject: RE: RE: area 0 inactiv
e - okay?
05/17/2002 03:22
PM
True, I do not have an interface in area 0 on router 6 but in the "sh ip
ospf" output it shows that area 0 is inactive. Perhaps this is normal, I
don't know, I suppose that is what I am trying to figure out. Here is the
"sh ip ospf" on router 6 and the "router ospf 1" configs, which, as you can
see it doesn't have any interfaces in area 0 (Thanks!)-
Routing Process "ospf 1" with ID 150.10.6.6
Supports only single TOS(TOS0) routes
Supports opaque LSA
It is an autonomous system boundary router
Redistributing External Routes from,
rip with metric mapped to 20, includes subnets in redistribution
SPF schedule delay 5 secs, Hold time between two SPFs 10 secs
Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs
Number of external LSA 11. Checksum Sum 0x495D9
Number of opaque AS LSA 0. Checksum Sum 0x0
Number of DCbitless external and opaque AS LSA 0
Number of DoNotAge external and opaque AS LSA 0
Number of areas in this router is 2. 2 normal 0 stub 0 nssa
External flood list length 0
Area BACKBONE(0) (Inactive)
Number of interfaces in this area is 0
Area has no authentication
SPF algorithm executed 12 times
Area ranges are
Number of LSA 1. Checksum Sum 0x1DCA
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
Area 5
Number of interfaces in this area is 3
Area has no authentication
SPF algorithm executed 52 times
Area ranges are
Number of LSA 23. Checksum Sum 0xD3E89
Number of opaque link LSA 0. Checksum Sum 0x0
Number of DCbitless LSA 0
Number of indication LSA 0
Number of DoNotAge LSA 0
Flood list length 0
router ospf 1
log-adjacency-changes
redistribute rip metric 20 metric-type 1 subnets route-map fromrip
network 150.10.6.6 0.0.0.0 area 5
network 150.10.60.0 0.0.0.255 area 5
network 150.10.65.2 0.0.0.0 area 5
-----Original Message-----
From: Jeffery S Kimes [mailto:kimes@us.ibm.com]
Posted At: Friday, May 17, 2002 5:07 PM
Posted To: CCIE-Maillist
Conversation: RE: area 0 inactive - okay?
Subject: RE: RE: area 0 inactive - okay?
I thought that in a previous post that someone pointed out that you didn't
have an interface in area 0? If not, that is why I would assume that it is
inactive...
"CCIE-Maillist"
<CCIE-Maillist@fo To: Jeffery S
Kimes/San Diego/IBM@IBMUS
xgal.com> cc:
<ccielab@groupstudy.com>
Sent by: Subject: RE: RE: area 0
inactive - okay?
nobody@groupstudy
.com
05/17/2002 02:49
PM
Please respond to
"CCIE-Maillist"
Jeffery,
Okay. Thank you, that clears things up a bit.
I was reading in Prac. Studies V1 and it clearly states that area 0 is
required. I think this assumes that you have more than one area or just for
good planning as you don't know when you might need another area. But, if
you do have more than one area, everything must go through the backbone and
that is area 0.
Now, any idea why my area 0 shows inactive but everything seems to
distribute routes and communicate properly? I have yet to figure that one
out.
Thanks for your help.
David
-----Original Message-----
From: Jeffery S Kimes [mailto:kimes@us.ibm.com]
Sent: Friday, May 17, 2002 4:42 PM
To: Davis, David
Subject: RE: RE: area 0 inactive - okay?
I think the backbone area is area 0! I think that the way that OSPF routes
packets is to an address within its area first, then if it has to go to
another area, it finds the quickest way to area 0, routes it across area 0,
then to it's destination area... So, if you are going to have more than 1
area, there has to be an area 0. Otherwise, if you are only going to have
1 area, you can use any number you want (though most people use 0).
"Davis, David"
<DDavis@foxgal.co To: Jeffery S
Kimes/San Diego/IBM@IBMUS
m> cc:
Subject: RE: RE: area 0
inactive - okay?
05/17/2002 02:34
PM
Ahh, yes, that rings a bell...
Maybe I am thinking of the "backbone", that everything has to go through
the backbone. Although the backbone is usually called area 0, maybe it
doesn't have to be.
I am reading in the Parkhurt book. it says-
"All non-zero ospf areas must have a connection to the backbone or Area 0
and area 0 must be contiguous."
That hints that the backbone doesn't have to be area 0 but, I'm still
reading...
But, then the question I am left with is if this router 6 in my area 5 has
a section for "
area 0", is it trying to tell me something is misconfigured by saying that
area 0 is inactive?
David
-----Original Message-----
From: Jeffery S Kimes [mailto:kimes@us.ibm.com]
Sent: Friday, May 17, 2002 4:24 PM
To: Davis, David
Subject: RE: RE: area 0 inactive - okay?
Correct me if I'm wrong... but I don't think that you HAVE to haven an
area 0. I would think that if you didn't have an area 0, that there would
be no routing between areas. In other words, you network would all have to
be the same area... ???
"Davis, David"
<DDavis@foxgal.co To: "Michael Canfield"
<ccnpccdp@hotmail.com>, <ca_vices@indiatimes.com>
m> cc:
<ccielab@groupstudy.com>
Sent by: Subject: RE: RE: area 0
inactive - okay?
nobody@groupstudy
.com
05/17/2002 01:36
PM
Please respond to
"Davis, David"
Michael,
Thanks for your help.
I know with OSPF everything has to have a connection to area 0.
In this configuration, is it okay that area 0 shows inactive? Or is the
fact that area 0 is inactive telling me that I need to "fix" something?
If I had some trouble with route redistribution, I would know that I need
to fix something but, as far as I can tell, it seems to work.
Thanks,
David
-----Original Message-----
From: Michael Canfield [mailto:ccnpccdp@hotmail.com]
Sent: Friday, May 17, 2002 3:18 PM
To: Davis, David; ca_vices@indiatimes.com
Cc: ccielab@groupstudy.com
Subject: RE: RE: area 0 inactive - okay?
Your R6 config shows no networks assigned to area 0, thats why area 0 shows
inactive on R6
>router ospf 1
>log-adjacency-changes
>area 0 authentication message-digest
>redistribute rip metric 20 metric-type 1 subnets route-map fromrip
>network 150.10.6.6 0.0.0.0 area 5
>network 150.10.60.0 0.0.0.255 area 5
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:59:00 GMT-3