From: Jim\(thrupoint\) (jgrina@xxxxxxxxxxxxx)
Date: Mon Feb 12 2001 - 16:34:39 GMT-3
Frank,
If you have done several of the ccbootcamp labs, you should have hit ones
where almost everything is in the same class A or B network, and other labs
where almost everything is in different class C networks. I would expect
that the CCIE lab exam would have a mix of networks and subnets, such that
you have to summarize subnets, separate networks and supernet. Some network
numbers should be your choice, and some will be their choice. I would
suggest that the host number match the router number, whereever possible.
But I wouldn't count on any scheme holding up in the exam.
Jim
----- Original Message -----
From: "frank wells" <fwells12@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Monday, February 12, 2001 2:07 PM
Subject: IP addressing thoughts...
> I am giving a little thought to how I am going to handle the IP addressing
> in the lab. Regardless of the IP address/mask I am given I want to come
up
> with a scheme which allows me easy summarization of all routers and their
> connected OSPF network segments.
>
> I am almost certain Cisco will throw the VLSM-FLSm issues at me and I want
> to be prepared.
>
> Lets say we get the following address/mask given to use: 172.16.0.0 and
we
> are able to cut it up any way we want.
>
> Give me your thoughts on the following idea:
>
> 172.16.0.0 use mask 255.255.240.0 to get 14 useable subnets (not including
> subnet zero) I chose the 24 bit subnet mask to anticipate being given
> possible RIP/IGRP FLSM addresses to
> deal with. I assign a contiguous range of subnets to each router like so:
>
> R1=172.16.16.0 - 172.16.31.0
> R2=172.16.32.0 - 172.16.47.0
> R3=172.16.48.0 - 172.16.64.0
> R4=172.16.64.0 - 172.16.71.0
> R5=172.16.72.0 - 172.16.87.0
> R6=172.16.88.0 - 172.16.95.0
> R7=172.16.96.0 - 172.16.111.0
> R8=172.16.112.0 - 172.16.127.0
>
> Now when asked to do something like intra-area summarization to the max, I
> can easily summarize each routers connected networks with a simple command
> like area 1 range 172.16.16.0 255.255.240.0 right?
>
> Also, by planning this way I would like to be able to address my network
> before I begin typing it into the routers. This would give me an
advantage
> as I would be able to assign the highest IP addresses in the respective
> subnets to a/the loopback addresses etc. Ultimately I want to not have to
> reboot the routers because I created an OSPF adjacency prior to adding the
> loopbacks etc.
>
> I am also thinking about drawing a line on top of my picture and deviding
it
> into as many segemnts as I have routers like so:
>
> R1 R2 R3 R4 R5 R6 R7 R8
> |-------|-------|-------|-------|-------|-------|-------|-------|
> 16 32 48 64 72 88 96 112 127
>
> By doing this I can easily mark off along my line which subnets I have
> already used too which may prove to be useful. Plus, it takes up little
to
> no room on your paper.
>
> Hope the ASCII pic isn't mangled too bad...
>
> Good idea/bad idea?, thoughts please.
>
>
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