Cisco 4500 Series Sup7e Install Notes
One of my projects at work is to replace a couple switches with newer (and larger) 4507R+E with Sup7e. I love projects like this because they're relatively straight forward, but mainly because they are fun! Who doesn't like unboxing a $60,000USD switch and firing it up? It's like a Cisco birthday or something.
Anyway, while configuring this thing, I've noticed a few quirks... idiosyncrasies? "Features"? Whatever you call them, they're new to me and I felt like blogging about it.
SD Memory in a Supervisor
First, just an observation: Cisco now has Secure Digital (SD) memory in a Supervisor. You might be thinking "yeah, I read about that when the Sup7e came out..." However for those who were in the dark, now you know. Here's a picture to share:
For at least the past decade, I've only seen Compact Flash (CF) cards in switch supervisors and routers. It's bittersweet to see CF memory go, but it's probably for the best as components shrink in size and increase in speed. The one thing that hasn't changed is the ridiculously high price for Cisco brand memory, they kept that feature.
The Second item on my observation list is IOS 15. I've deployed this on several ISRs and I've seen some switches using it, but this will be the first large chassis switch I've deployed with 15. The one thing to point out is some syntax differences on a couple common commands, either due to being deprecated or soon to be deprecated:
Switch(config)# enable secret 5 <password stuff>
is now written without the 5 indicating an MD5 hash:
Switch(config)# enable secret <password stuff>
Another common one that just doesn't show up now:
Switch(config)# ip classless
It just doesn't exist anymore. Perhaps this is because classful IP was all but retired in the 90s. Now we can all just safely assume we're talking CIDR (just in time for IPv6 to make its sweeping entrance).
TenGig Error Messages
One of the first things I noticed after connecting to the console was the following error message:
%SFF8472-5-THRESHOLD_VIOLATION: Te3/1: Rx power low alarm;
Operating value: -40.0 dBm, Threshold value: -13.9 dBm.
I posted a separate forum post on this one for search-ability reasons, which can be found here. Basically it's just saying a 10G SFP is not receiving anything (-40 dBm) when it's threshold is up at -13.9 dBm. In my case, it's because the switch has nothing plugged into it yet, but in a production switch case, it could be due to a bad patch cable, dirty connector, bad optic, or failing module.
If you've got any lessons learned you'd like to share on the Cisco 4500E platform or Sup7e, feel free to post below. As always, intelligent network related comments are appreciated. Thanks for reading.