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127 With One Blow!
Cisco 4400 Series Controllers OK, it was only 86 APs, but 127 sounded better and was the number of radios. I took out 127 radios with one blow. Here’s how I did it… I found a feature of IOS I was...
View ArticleNative VLAN Tagging
Why Native VLAN Tagging? Native VLAN Tagging is used when you want 802.1q to act a bit more like ISL in one way, namely you want it to tag the frames destined for the native VLAN. Normally, 802.1q does...
View ArticleRecovering a Cisco Fixed Switch from the Boot Loader
Wait, that’s not right… Let’s say you have Cisco fixed switch (2960, 3560, etc) and you copied over the tar file with an IOS upgrade, removed the old IOS, and rebooted the switch. Let’s say you forgot...
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CCNP SWITCH (642-813) Study Materials
There’s a ton of materials out there to help you study for Cisco exams. I just finished spending several months studying for the SWITCH exam and spending a lot of time with the Cisco Press materials. I...
View ArticleThe Mythical Sup2T
The mythical Supervisor Engine 2T for the Catalyst 6500 is no longer a myth. Cisco has finally officially announced the product and if you just bought Sup 720′s, you might be wishing you could have...
View ArticlePassword required, but none set
I had a strange thing happen today when I upgraded a 2960G from IOS 12.2 to 15.0. After booting the upgraded IOS, I logged in, entered the enable command, and was surprised to get this error:...
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Your old network gear is EoL, too…
Cisco 3560V2 Switches Cisco 3650 Unified Access Switches So yesterday, I pointed out that Your break room phones are EoL. Continuing on that EoL theme for Turkey week, I’m going to complicate your life...
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No More VLANs Jumping on the Trunk
No more VLANs jumping on the trunk. That’s what I wanted. Instead, I got all the VLANs and a nice supervisor debilitating loop in the process… From my after action report: “the issue was a...
View ArticleNexus 5k NTP Failure
Ran into this bug today. Went to a pair of Nexus 5500s to debug a vPC link and noticed the timestamps were off. I thought that was odd. I tried show ntp peer-status and received no output in return,...
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