Older Cisco equipment can function just as well as newer for 95% of lab scenarios. You are very unlikely to be needing to use all the newer features.
Anything that can run IOS 12.3 and is newer than a decade old can do a lot more than you think. We do all our BGP testing on a stack of 2600s and 3600s and never an issue even though in production its 2800s, 3800s etc.
Granted there are features that you do need the newer kit esp when syntax changes (e.g. IP SLA commands, newer netflow commands, class map based QoS to name three off the top of my head) but none of the core routing and switching features/commands has changed much since the introduction of CEF - they all do ACLs, route maps, OSPF, BGP, EIGRP, vlans, spanning tree, rapid spanning tree, IPSEC vpns. I'm speaking from an enterprise POV not a service provider but I'd imagine if you are in a telco environment you wouldn't be lacking gear.
For many minor test scenarios, you can pick a test branch office and use the good old 'reload in XYZ' command to ensure that no matter how badly you stuff it up, everything will bounce and come back (just remember NOT TO COPY RUN START lol).
Then there's the sleight of hand methods:
- always ordering more for projects than you really need. Par for the course really esp as most project managers haven't a clue when it comes to the nuts and bolts of a big cisco order.
- pushing for EOL replacements as early as possible, intentionally conflate end of sale with end of life.
- getting stuff in for projects as early as possible, then you have a month or two to use it as test gear.
- remember that your lab need not mirror reality, scale down as much as possible. e.g. to simulate a pair of 4506 multilayer switch running in VRRP, use a pair of 3560s. Use your CCO login and flash away to your hearts content (I know its breaching licencing but for test scenarios, meh).
Here are a few tools:
GNS3 - http://www.gns3.net/ - free network simulator, based on Dynamips Cisco emulator
Opnet - http://www.opnet.com/ - detailed planning of networks, from scratch
Traffic Explorer - http://packetdesign.com/ - plan changes to an existing network
It's the 9th circuit. Between the district courts and the appeals court, so many bad decisions come out of there it's not funny.
Yeah, and the costs are exactly on the same level, and the launch frequency probably has nothing to do how much government gives budget.
This sounds like a good working idea.
If all else fails, immortality can always be assured by spectacular error. -- John Kenneth Galbraith