Be aware that the 3660 router running ver 12.05T and 12.07T has an IPX bug
in it. This is fixed in all 12.1 releases
Andrew Larkins
Usko Communications
Tel: +2711 236-8000
Fax: +2711 236-8350
Cell: +2783-656-7214
Email: [EMAIL PROTECTED]
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-----Original Message-----
From: Tony Noll [mailto:[EMAIL PROTECTED]]
Sent: 18 May 2000 17:42
To: [EMAIL PROTECTED]
Subject: How do you decide what version of the IOS to use?
Some collegues of mine are having a discussion as to what are reasonable
guidelines to decide what version of the IOS to use on the various routers
on our network.
Currently we have Qtd. 4 3640s and Qtd. 1 4700 on our production network.
We recently purchased a 3660 to act as a temporary spare if any of these
routers went down. The 4700 is the center of our network and the 3640s serve
remote sites.
Disclaimer: I did not know of or make any of these decisions nor do I work
directly with these people or on this equipment. I am merely dependent on
them.
The 4700 died and the 3660 was pressed into service with 12.0.5T of the IOS
on it. This is what it was shipped with and my coworkers did not get around
to checking this out.***12.0.5T is a deferred verison of the IOS and from
what I understand it is evil***
The replacement 3660 had problems with its Ethernet and Token Ring
interfaces wedging and bringing the entire network down. After a day of
screwing around they finally updated to 12.0.7.
The 3660 platform does not have a release of code that has met the General
Distribution standard as of yet. It does have a version of the code that
meets the Limited Distribution standard according to Cisco...12.1.2 and
12.1.1
As of now the 3660 is still in the network at 12.0.7
The 3640s are at 12.0.4T ***A deferred version***
We have gotten a replacement 4700 from Cisco and are going to put it back
into the network.
It was running 11.2.18 prior to its failure and seemed pretty stable.
Not all of the people supporting these routers are extremely confident with
the IOS especially in an emergency. If the versions of IOS on these routers
had different syntax for any of the configuration commands, this could cause
problems in making a quick swap in an emergency. (They will probably not
have any premade configurations, but that is another battle.)
These routers support services that must be up 24/7.
I have these questions.
1. What version of the IOS would you put on each type of router and why?
2. How good a guide are the GD, LD, ED and DF status ratings of the IOS?
3. How important (if at all) do you think it is to have these core routers
at the same version of IOS?
4. How important do you think it is to use the latest version of the IOS?
5. When should you make this change?
Thanks very much for wading through this long posting. I have never found
any published guidelines on this topic other than what is on the Cisco
website. I will be sharing the responses with the people who make the
decisions regarging this equipment. It would be helpful if respondents gave
some indication of their level of experience or certification.
Thanks once again for your time and patience,
Tony
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