From: Scott Morris (smorris@ipexpert.com)
Date: Tue Oct 23 2007 - 16:46:22 ART
show commands and 'debug ip ospf adjacency'
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
_____
From: Jonny English [mailto:redkidneybeans@gmail.com]
Sent: Tuesday, October 23, 2007 3:37 PM
To: Scott Morris
Cc: Tarun Pahuja; Joseph Brunner; Ananth Vk; ccielab@groupstudy.com
Subject: Re: Query : Network Types
No need to memorize anything. You can get all the info you need to see why
something is not working through show commands.
Only need to understand the basic facts and your set :).
On 10/24/07, Scott Morris <smorris@ipexpert.com> wrote:
hehehehe... Yes, the response was a joke. (sort of)
There are indeed 15 ways to combine those network types, math doesn't lie.
No, all of them will not work together.
However, that's the point of learning is it not? If you are interested in
finding some document which may or may not contain all the possibilities and
memorize it, go ahead. If you are interested in trying something out and
attempting to learn WHY it will or will not work, you'll have much better
retention of knowledge and depth of knowledge at that point.
The second path will take a little longer, but the long-term reward is much
greater.
"Any fool can know. The point is to understand." -- Albert Einstein
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
_____
From: Tarun Pahuja [mailto:pahujat@gmail.com]
Sent: Tuesday, October 23, 2007 4:15 AM
To: Scott Morris
Cc: Joseph Brunner; Ananth Vk; ccielab@groupstudy.com
Subject: Re: Query : Network Types
Scott,
I hope your last response was not a Joke ;-) I know you like to
joke sometimes........
There are 5 different type of network types under ospf namely:
1. broadcast
2. non-broadcast
3. point-to-point
4. point-to-multipoint
5. point-to-multipoint non-broadcast
One can not simply use 5+4+3+2+1 logic or any other mathematical logic to
figure out what possible combinations are possible. Every network type under
ospf has certain characteristics(DR/BDR,Hello,Dead interval,etc). For ospf
to form adjacency with neighbors certain conditions must be met or else no
relationship would be formed. Additionally, as per Cisco Routing and
Switching official exam guide, it is not recommended to form neighbor
relationship between ospf network types requiring a DR/BDR and network types
that do not require a DR/BDR in NBMA networks even though the neighbor
relation comes up after fine tuning the Hello/Dead intervals.
http://books.google.com/books?id=dKzpj4r7KCwC
<http://books.google.com/books?id=dKzpj4r7KCwC>
<http://books.google.com/books?id=dKzpj4r7KCwC
<http://books.google.com/books?id=dKzpj4r7KCwC&pg=PA270&lpg=PA270&dq=nbma+os
> &pg=PA270&lpg=PA270&dq=nbma+os
pf+network+type&source=web&ots=qLxQS3ST7M&sig=VpZJ06-c7z-fn6wz4MPb8Ocwk-U>
&pg=PA270&lpg=PA270&dq=nbma+ospf+network+type&source=web&ots=qLxQS3ST7M&sig=
VpZJ06-c7z-fn6wz4MPb8Ocwk-U
HTH,
Tarun Pahuja
CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
On 10/22/07, Scott Morris <smorris@ipexpert.com> wrote:
It's just math. 5+4+3+2+1 I didn't spend any time thinking more about what
things would/wouldn't change. That's the part about studying. :)
-----Original Message-----
From: Joseph Brunner [mailto:joe@affirmedsystems.com]
Sent: Monday, October 22, 2007 10:45 AM
To: 'Scott Morris'; 'Ananth Vk'; ccielab@groupstudy.com
Subject: RE: Query : Network Types
Scott is that 15 number including when we use 2 network types that do/don't
require a dr and change the timers?
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Morris
Sent: Monday, October 22, 2007 10:20 AM
To: 'Ananth Vk'; ccielab@groupstudy.com
Subject: RE: Query : Network Types
As long as you have labbed those up and SEEN how things work, you'll have no
worry about the order or combination or anything.
There are 5 network types:
1. broadcast
2. non-broadcast
3. point-to-point
4. point-to-multipoint
5. point-to-multipoint non-broadcast
If you are aware of the details of each, you'll be fine. Mathematically,
there are 15 different combinations you can come up with.
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M
#153, JNCIS-ER, CISSP, et al.
CCSI/JNCI-M/JNCI-ER
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ananth Vk
Sent: Monday, October 22, 2007 5:31 AM
To: ccielab@groupstudy.com <mailto:ccielab@groupstudy.com>
<mailto:ccielab@groupstudy.com>
Subject: Query : Network Types
Hi
I just wanted to confirm that these are the following network types
regardless of layer 3 protocol
1. point to point - serial point to point links
2. broadcast - lan
3. NBMA (FR/ATM/etc)
A. Pure Point-to-Point Configuration (each VC on a separate subinterface)
B. Pure Multipoint Configuration (no subinterfaces)
C. Hybrid Configuration (point-to-point and multipoint subinterfaces)
I got this from a cisco link, is this the right order/fashion that i should
remember / is there a different perspective ?
Pls advice !
Thanks
Ananth
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