RE: subnets [7:638]
As a matter of good practice, one should always use the no auto-summary on
all (E) IGRP and RIP networks, unless you have a very good reason not to.
As an aside, one should always use the "subnets" switch when redistributing
into OSPF. Hhmmm Upon reflection maybe this one is a bit more open than
I originally thought
More of the kinds of gotchas that can make your lab preparation more
challenging than you might want. ;->
Chuck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Tony
van Ree
Sent: Monday, April 16, 2001 3:58 PM
To: [EMAIL PROTECTED]
Subject: Re: subnets [7:638]
The most acurate address mask (prefix) would win. Even if you had
172.16.0.0/16 then put in an address of 172.16.20.0/24 the /24 would get a
choice over the /16.
That's what I understood and has been done a lot with EIGRP.
Teunis,
Hobart, Tasmania
Australia
On Sunday, April 15, 2001 at 11:31:38 AM, David Chandler wrote:
> No problem:
>
> #1. The addresses listed do not overlap (all different class Bs), and
EIGRP
> handles
> VLSM. **see #2**
>
> #2. EIGRP by default auto-summarizes at classful boundries, so either use:
>
> (config-router)#NO AUTO-SUMMARY {on all eigrp routers.}
>
> Or make just make sure you don't create multiple clouds of
172.20.xxx.xxx/24
> networks.
>
>
>
> DaveC
>
>
>
>
>
> SH Wesson wrote:
>
> > Our existing network consists of a flat network at 172.16.0.0 with a
mask
> of
> > 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is
flat,
> > the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is
> > running. Now, the question I have is, if I create new subnets to
segment
> > the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all
> > with masks of 255.255.255.0 and if I run EIGRP also. If I were to run
both
> > the above networks at once and within the same EIGRP process, would it
> cause
> > any problems. Thanks.
> >
> > _
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
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Re: subnets [7:638]
The most acurate address mask (prefix) would win. Even if you had
172.16.0.0/16 then put in an address of 172.16.20.0/24 the /24 would get a
choice over the /16.
That's what I understood and has been done a lot with EIGRP.
Teunis,
Hobart, Tasmania
Australia
On Sunday, April 15, 2001 at 11:31:38 AM, David Chandler wrote:
> No problem:
>
> #1. The addresses listed do not overlap (all different class Bs), and EIGRP
> handles
> VLSM. **see #2**
>
> #2. EIGRP by default auto-summarizes at classful boundries, so either use:
>
> (config-router)#NO AUTO-SUMMARY {on all eigrp routers.}
>
> Or make just make sure you don't create multiple clouds of
172.20.xxx.xxx/24
> networks.
>
>
>
> DaveC
>
>
>
>
>
> SH Wesson wrote:
>
> > Our existing network consists of a flat network at 172.16.0.0 with a mask
> of
> > 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat,
> > the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is
> > running. Now, the question I have is, if I create new subnets to segment
> > the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all
> > with masks of 255.255.255.0 and if I run EIGRP also. If I were to run
both
> > the above networks at once and within the same EIGRP process, would it
> cause
> > any problems. Thanks.
> >
> > _
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
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Re: subnets [7:638]
No problem:
#1. The addresses listed do not overlap (all different class Bs), and EIGRP
handles
VLSM. **see #2**
#2. EIGRP by default auto-summarizes at classful boundries, so either use:
(config-router)#NO AUTO-SUMMARY {on all eigrp routers.}
Or make just make sure you don't create multiple clouds of 172.20.xxx.xxx/24
networks.
DaveC
SH Wesson wrote:
> Our existing network consists of a flat network at 172.16.0.0 with a mask
of
> 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat,
> the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is
> running. Now, the question I have is, if I create new subnets to segment
> the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all
> with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both
> the above networks at once and within the same EIGRP process, would it
cause
> any problems. Thanks.
>
> _
> Get your FREE download of MSN Explorer at http://explorer.msn.com
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
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Re: subnets [7:638]
No problem: #1. The addresses listed do not overlap (all different class Bs), and EIGRP handles VLSM. **see #2** #2. EIGRP by default auto-summarizes at classful boundries, so either use NO IP AUTO-SUMMARY, or make sure you don't create multiple clouds of 172.20.xxx.xxx/24 networks. DaveC SH Wesson wrote: > Our existing network consists of a flat network at 172.16.0.0 with a mask of > 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat, > the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is > running. Now, the question I have is, if I create new subnets to segment > the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all > with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both > the above networks at once and within the same EIGRP process, would it cause > any problems. Thanks. > > _ > Get your FREE download of MSN Explorer at http://explorer.msn.com > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=654&t=638 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: subnets [7:638]
I can't any reason why it wouldn't work. The only thing I would mention is that older IOS using EIGRP doesn't allow you to specify a mask with the network command, and wouldn't allow you to be granular with your networks if you don't want to specify all of them to be known in EIGRP. If you want all the networks in your EIGRP tables, then it'll work just fine. You might also need to consider 'no auto-summary,' depending on how well you've planned (or rather, if there is a lack of planning and summarization will cause a problem). -- Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+ List email: [EMAIL PROTECTED] Homepage: http://jason.artoo.net/ ""SH Wesson"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Our existing network consists of a flat network at 172.16.0.0 with a mask of > 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat, > the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is > running. Now, the question I have is, if I create new subnets to segment > the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all > with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both > the above networks at once and within the same EIGRP process, would it cause > any problems. Thanks. > > > _ > Get your FREE download of MSN Explorer at http://explorer.msn.com > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=646&t=638 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
subnets [7:638]
Our existing network consists of a flat network at 172.16.0.0 with a mask of 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat, the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is running. Now, the question I have is, if I create new subnets to segment the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both the above networks at once and within the same EIGRP process, would it cause any problems. Thanks. _ Get your FREE download of MSN Explorer at http://explorer.msn.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=638&t=638 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
