Can anyone please explain to me how to aggregate the following 3 routes?
172.16.1.0 /24
172.16.2.0 /24
172.16.3.0 /24
into...
172.16.0.0 /22
_
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In route aggregation you normally match the number of
bits from left to right until a mismatch occurs and
that's how you get 172.16.0.0 /22 since for the third
octet
0001
0010
0011
the common bits are the first 6 bits
hope this helps
suaveguru
--- Hunt <[EMAIL PROTECTED]> wrote:
When you summarize these addresses to a /22 it also includes
172.16.0.0/24
Joe
"suaveguru" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
| In route aggregation you normally match the number of
| bits from left to right until a mismatch occurs and
| that's how
I will try to explain my way of working out summarisation. I'm not among the
Cisco genius group, but never have problems with it, because of the method I
use.
You need to start thinking of things as a power of 2.
You've taken two bits from the third octet to summarise your networks.
2 to the powe
Router ospf 100
network 20.1.1.0 0.0.0.255 area 5
network 20.1.2.0 0.0.0.255 area 5
network 20.1.3.0 0.0.0.255 area 5
network 212.1.22.64 0.0.0.31 area 0
area 5 range 20.1.0.0 255.255.252.0
Is the above summarization valid for the above networks?
Thanks,
Evan
hi
could someone tell me what is vlsm , route summarization and cidr
maybe its the lack of grey matter in my head but cant seem to make out the
diff btwn cidr and summarization
thanx in advace..
jeff
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http
Could you summarize these routes?
156.109.8.0/22
156.109.16.0/22
156.109.20.0/22
156.109.24.0/22
156.109.28.0/22
156.109.32.0/22
My summarization is:
156.109.8.0/22
156.109.16.0/20
156.109.32.0/22
is it correct?
thanks in advance.
iWon.
Does anyone know if route summary is avaliable in rip
(v1/v2) on the cisco router. I know it can be down in
OSPF and EIGRP.
Thanks
Adam
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I want to summarize three addresses within an OSPF area:
10.2.1.0/24
10.2.2.0/24
10.2.3.0/24
Converting to binary, I see the 15th bit is the highest order bit the three
addresses have in common. From that I see the summary address is 10.2.0.0.
What I don't understand is why the subnet mask is 1
VLSM - Variable-length subnet mask. The ability to specify a different subnet
mask
for the same network number on different subnets. VLSM can help optimize
available
address space.
Route Summarization - The consolidation of advertised addresses in OSPF and
IS-IS.
In OSPF, this causes a single
If you want to summary them into ONE route , it should be 156.109.0.0/18.
your sum is correct but not optimal.
"jeongwoo park" <[EMAIL PROTECTED]> wrote in message
385159212.960392415364.JavaMail.root@web185-iw">news:385159212.960392415364.JavaMail.root@web185-iw...
> Could you summarize these ro
I agree with that.
- Original Message -
From: "Johnny Dedon" <[EMAIL PROTECTED]>
To: "Daniel Ji" <[EMAIL PROTECTED]>
Sent: Wednesday, June 07, 2000 9:58 AM
Subject: Re: route summarization help
> Your summarization would summarize the needed routes
I will second that ..
Regards
Atif Awan
-Original Message-
From: Daniel Ji <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Wednesday, June 07, 2000 9:55 PM
Subject: Re: route summarization help
>If you want to summar
6/07 7:59 PM >>>
I will second that ..
Regards
Atif Awan
-Original Message-
From: Daniel Ji <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Wednesday, June 07, 2000 9:55 PM
Subject: Re: route summarization help
&g
wan
>
>
> -Original Message-
> From: Daniel Ji <[EMAIL PROTECTED]>
> Newsgroups: groupstudy.cisco
> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
> Date: Wednesday, June 07, 2000 9:55 PM
> Subject: Re: route summarization help
>
>
> >If you want to
Hello All,
I have a question about route summarization. I was reading over the
material from Cisco on the matter, I was wondering; or actually
assuming. If you want to have route summarization in place to you need
continuos network numbers? I know that the docs. said you would send a
2001 1:39 PM
To: [EMAIL PROTECTED]
Subject: route summarization in rip
Does anyone know if route summary is avaliable in rip
(v1/v2) on the cisco router. I know it can be down in
OSPF and EIGRP.
Thanks
Adam
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: [EMAIL PROTECTED]
Subject:Route Summarization [7:1794]
I want to summarize three addresses within an OSPF area:
10.2.1.0/24
10.2.2.0/24
10.2.3.0/24
Converting to binary, I see the 15th bit is the highest order bit the three
addresses have in common. From that I see the summary address
.0.0.0/15 might be
> it.
>
> Chuck
>
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> Stephen Alston
> Sent: Tuesday, April 24, 2001 6:07 PM
> To: [EMAIL PROTECTED]
> Subject: Route Summarization [7:1794]
>
> I want to
Actually, the 22nd bit is the highest common bit.
10.2.0001.0
10.2.0010.0
10.2.0011.0
The longest summary for this would be 10.2.0.0 /22
Summarizing the range 10.2.0.0 thru 10.2.3.255
Stephen Alston wrote:
> I want to summarize three addresses within an OSPF area:
>
> 10.2.1.0/24
>I want to summarize three addresses within an OSPF area:
>
>10.2.1.0/24
>10.2.2.0/24
>10.2.3.0/24
>
>Converting to binary, I see the 15th bit is the highest order bit the three
>addresses have in common. From that I see the summary address is 10.2.0.0.
>What I don't understand is why the subnet
OK, I think I got it.
/15 doesn't make sense if I want to pick up just a 10.2.0.0 network because
it would also pick up a 10.3.0.0 network.
/16 will work if its the intent to summarize at 10.2.0.0, however that over
summarizes if its not our intent to pick up 10.2.0.0
Therefore the three address
Steve
The missing one if advertised with smaller block will take effect.
Rgds,
Kiran
>From: "Steven Aiello"
>Reply-To: "Steven Aiello"
>To: [EMAIL PROTECTED]
>Subject: Route Summarization [7:62347]
>Date: Mon, 3 Feb 2003 14:15:20 GMT
>
>Hello A
Steven Aiello wrote:
>
> Hello All,
>
> I have a question about route summarization. I was reading
> over the
> material from Cisco on the matter, I was wondering; or actually
> assuming. If you want to have route summarization in place to
> you need
> continu
ing route summarization is as follows:
172.21.136.0/24 and 172.21.143.0/24 can be summarized as: ??
We both came to the same conclusion:
^
172.21.136.0 -> 10101100.00010101.10001000.
172.21.143.0 -> 10101100.00010101.1000
]On Behalf Of
> Chuck Larrieu
> Sent: Friday, September 14, 2001 11:24 AM
> To: [EMAIL PROTECTED]
> Subject: RE: route summarization question [7:19970]
>
>
> Cisco wrong? Perish the thought!!! ;->
>
> seeing as 134 is 1110, and is in no way relevant here, I wou
arrieu
> Sent: Friday, September 14, 2001 11:24 AM
> To: [EMAIL PROTECTED]
> Subject: RE: route summarization question [7:19970]
>
>
> Cisco wrong? Perish the thought!!! ;->
>
> seeing as 134 is 1110, and is in no way relevant here, I would suggest
> that the lazy
cat's outta da bag now. but i'm sure your name will be there (Technical
Editor, Chuck Larrieu, CCIE 82**) on the front of every text.
;-)
-e-
- Original Message -
From: "Chuck Larrieu"
To:
Sent: Friday, September 14, 2001 11:11 AM
Subject: RE: route summarizati
Does anyone know of a way to summarize an OSPF address (such as a / 27 bit
subnet mask) to a classful boundary for redistribution into a classful IGP
such as RIP v1 or IGRP?
Any suggestions would be appreciated!!!
Thanks!!!
LAB
_
FAQ, list archives, and subscrip
Okay, this doesn't quite qualify as a trick question but I'm having
trouble finding the answer. I hope it's not too obvious or I'll be
embarrassed. :-) While working on one of the Fatkid's labs I see the
following in the Hints sections:
3. There are two built in OSPF methods to summarize OS
i am confused about the difference between ospf LSA summarization and
route summarization, i know they are different and also have certain
relationship,the LSA summarization is automatic runned at ABR,and the
route summarization must be manually configured.
what's the relationship o
Here's my guess. I've included the first two for clarity.
1. Inter-area route summarization with commands of the form
"area 1 range 10.1.2.0 255.255.224.0"
2. External route summarization with commands of the form
"summary-address 10.1.2.0 225.255.224.0&quo
thod. I wonder if it involves
some sort of incantation.
Thanks,
John
>>> Jonathan Hays 10/22/01 9:01:49 AM >>>
Here's my guess. I've included the first two for clarity.
1. Inter-area route summarization with commands of the form
"area 1 range 10.1.2.0 255.
, 2001 09:33
To: [EMAIL PROTECTED]
Subject: OSPF Route Summarization Trick Question [7:23771]
Okay, this doesn't quite qualify as a trick question but I'm having
trouble finding the answer. I hope it's not too obvious or I'll be
embarrassed. :-) While working on one of the Fa
ssage-
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 10:14
To: [EMAIL PROTECTED]
Subject: RE: OSPF Route Summarization Trick Question [7:23771]
Yep, distribute-lists could work in conjuction with Jonathan's
suggestion of redistributing a static route. I
king about OSPF then ask if there were
other
ways
to accomplish the same goal by using a non-protocol dependent,
non-router
platform
dependent method?
-Original Message-
From: John Neiberger [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 22, 2001 10:14
To: [EMAIL PROTECTED]
Subject: R
Hey all. I'm going to risk starting a flame war by asking the following:
I've been struck by just how much importance Cisco courseware places on
route summarization. For example, every student who goes through CCNP-level
courseware learns about all the various kinds of summarizat
Performance gains are only a small part of the
picture... what is more important is enforcing a
proper hierarchical addressing scheme that conceals
routing instabilities from the network as a whole, and
lessens the amount of routing update traffic
propagated across the entire network.
It's gott
>Hey all. I'm going to risk starting a flame war by asking the following:
>
>I've been struck by just how much importance Cisco courseware places on
>route summarization. For example, every student who goes through CCNP-level
>courseware learns about all the vario
I thought somebody was going to talk about masking instabilities. But then
that begs the question - in a typical enterprise network (therefore a small
one of 100 routes or less), if you are suffering from routing instabilities,
isn't your time better spent to try to figure out why your routes are
>I thought somebody was going to talk about masking instabilities. But then
>that begs the question - in a typical enterprise network (therefore a small
>one of 100 routes or less), if you are suffering from routing instabilities,
>isn't your time better spent to try to figure out why your routes
--- nrf wrote:
> I thought somebody was going to talk about masking
> instabilities. But then
> that begs the question - in a typical enterprise
> network (therefore a small
> one of 100 routes or less), if you are suffering
> from routing instabilities,
> isn't your time better spent to try to
Forwarded by Jenny Mcleod/NSO/CSDA on 02/08/2001
04:48 pm ---
"nrf" @groupstudy.com on 02/08/2001 02:42:45 pm
Please respond to "nrf"
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Just how important is route summarization in
>Hey all. I'm going to risk starting a flame war by asking the following:
>
A bit more precision. You have to consider more than one kind of
performance. One is route lookup in the fast forwarding path, and
the other is changing the routing table (possibly in the same
processor that does for
She has a way of doing that =)
Mike W.
"nrf" wrote in message
news:[EMAIL PROTECTED]...
> Thank you Priscilla. You said it better than I ever could. I guess this
is
> why you're a famous author and I'm not.
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=14745&t=14745
---
gt; >
> >""Bill Pearch"" wrote in message
> >news:[EMAIL PROTECTED]...
> > > Yes!
> > > An oil field engineer summed it up this way: When designing
something,
> > > design it so three disasters have to happen at the same time before
> >
gt; things but I was hoping that delhi-lama elvis would knock ya off your high
> horse.
> I'll throw you a bone there biff, Not All Summarized routes are Supernets.
> Call me at 3am when you figure it out.
>
>
>
> - Original Message -
> From: "nrf"
the difference
> between summarization and supernetting. i'll bet you can't
>
>
>
> - Original Message -
> From: "nrf"
> To:
> Sent: Friday, August 03, 2001 2:19 PM
> Subject: Re: Just how important is route summarization in typical
[7:14841]
[EMAIL PROTECTED] wrote:
> I agree with you, Howard. All the best practices I have ever
> learned have
> stated that route summarization should be avoided, and, if not
> possible, at
> least minimized. I think unless you have a large network with
> multiple AS's,
>
[EMAIL PROTECTED]]On Behalf Of
GB
Sent: Friday, August 03, 2001 5:12 PM
To: [EMAIL PROTECTED]
Subject: Re: Just how important is route summarization in typical
[7:14854]
Just ignore him DJ, what he's trying to do is just retain his "job security"
as head idiot. By telling his manageme
he hell do you not understand now?!?!" as
> the beginning of his training sessions. I don't blame his "very junior NT
> admins" from trying to stay away as far as possible from this guy...
>
>
>
>
> - Original Message -
> From: "Donald B John
huck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Michael L. Williams
Sent: Thursday, August 02, 2001 5:19 PM
To: [EMAIL PROTECTED]
Subject: Re: Just how important is route summarization in typical
[7:14734]
I guess (to flip your question around) are
--
> From: nrf [SMTP:[EMAIL PROTECTED]]
> Sent: Friday, August 03, 2001 2:27 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Just how important is route summarization in typical
[7:14814]
>
> My biggest problem with summarization so far:
>
>
> Ring-Ring-Ring - my cellphone goes o
gt;were not engineered to take 3 disasters at once.
> > >
> > >
> > >
> > >""Bill Pearch"" wrote in message
> > >news:[EMAIL PROTECTED]...
> > > > Yes!
> > > > An oil field engineer summed it up this way: When desig
, and, WHEN YOU KNOW EXACTLY WHAT YOU
ARE DOING, in and out of BGP.
At 03:15 PM 8/3/2001 -0400, you wrote:
>[EMAIL PROTECTED] wrote:
> > I agree with you, Howard. All the best practices I have ever
> > learned have
> > stated that route summarization should be avoided
intellectual failure there.
Proving the adage, "you can lead a horticulture but you can't make her
think."
>-Original Message-
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
>GB
>Sent: Friday, August 03, 2001 5:12 PM
>To: [EMAIL PROTECTED]
&
n driver in
>determining
> > the usefulness of summarization. since the question was asked, I am
>assuming
> > that the asker works in an environment where summarization is possible
and
> > makes sense ( except for the issue of the clueless subordinates, but
>that's
&g
"Howard C. Berkowitz" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> One compromise -- design your addressing plan hierarchically,
> so if you do subsequently need to summarize, you don't need to
> renumber.
Is there any case when using hierarchical addressing where you *wouldn'
this thread)
where would you see a disadvantage?
Chuck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Michael L. Williams
Sent: Sunday, August 05, 2001 9:26 AM
To: [EMAIL PROTECTED]
Subject: Re: Just how important is route summarization in typical
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