From: Ron.Fuller@xxxxxx
Date: Mon Feb 12 2001 - 16:46:21 GMT-3
Frank,
That's a good plan, but the nice lab proctors have a different idea in
store for you. :) I sat the lab more times than I care to remember and was
never given a scenario that was THAT easy. They intentionally make it much
more difficult. In the real world, that would be a perfect idea to use for
a design, but remember the lab is a microcosm of the real world. They
typically are very specific as to what masks to use and where they want
them.
Ron Fuller, CCIE #5851, CCDP, CCNP-ATM, CCNP-Security, CCNP-Voice, MCNE
3X Corporation
rfuller@3x.com
"frank wells"
<fwells12@hot To: ccielab@groupstudy.com
mail.com> cc:
Sent by: Subject: IP addressing thoughts...
nobody@groups
tudy.com
02/12/2001
02:07 PM
Please
respond to
"frank wells"
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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