Portfast + bpdufilter (used together) can be enabled globally or at interface level.
Although the first impression is that the only difference is the global or per-interface effect, this is not entirely true and another subtle and important difference is described in this post.
Welcome on my very first post on my new fresh technical blog!
This post shows different ways of how to match packets based on their length. While this may not be very common in real production, you will find it useful during your CCIE preparations.
I've updated my SNMP MIBs to support OpenBSD 4.9.
I used to have a machine sitting around that I would power up whenever I needed to build a new OpenBSD kernel or rebuild the source tree due to a patch or a new version of the OS being released. Eventually I moved that machine into a VirtualBox virtual machine running on my desktop. Recently I moved that VM into VMWare's free ESXi hypervisor running on some pretty decent hardware. It got me wondering how much I could lower compile times by adjusting how many vCPUs were allocated to the VM.
As a follow-on to my previous post about disabling plugins, this script will enable plugins from the shell.
For reference here is the complete list of Cisco devices, including RAM, Flash, installed modules and IOS versions that I’ve used to build my home lab.
| Device | Platform | RAM | Flash | Modules | IOS |
|---|---|---|---|---|---|
| SW1 | WS-C3560-24TS | 128MB | 32MB | n/a | c3560-advipservicesk9-mz.122-44.SE.bin |
| SW2 | WS-C3550-24 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| SW3 | WS-C3550-24 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| SW4 | WS-C3550-48 | 64MB | 16MB | n/a | c3550-ipservicesk9-mz.122-25.sec2.bin |
| R1 | 2610XM | 128MB | 32MB | WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R2 | 2610XM | 128MB | 32MB | WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R3 | 2651XM | 160MB | 32MB | 2x WIC-2T= | c2600-adventerprisek9-mz.124-25d.bin |
| R4 | 2801 | 256MB | 64MB | WIC-2T= | c2801-adventerprisek9-mz.124-24.T4.bin |
| R5 | 1841 | 384MB | 128MB | WIC-2T= | c1841-adventerprisek9-mz.124-24.T4.bin |
| R6 | 2691 | 256MB | 64MB | WIC-2T= | c2691-adventerprisek9-mz.124-15.T14.bin |
| R7 | 3725 | 256MB | 128MB | 2x WIC-1T=, NM-2FE2W-V2= | c3725-adventerprisek9-mz.124-15.T14.bin |
| BB1 | 2522 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| BB2 | 2520 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| BB3 | 2520 | 16MB | 16MB | n/a | c2500-is-l.122-15.T17.bin |
| CON | 2610 | 64MB | 16MB | NM-16A=, WIC-1T= | c2600-ik9o3s3-mz.123-26.bin |
Lately I've been working with a separate instance of my WordPress site for development and testing of plugins, my theme, etc. I have a helper script that orchestrates the pulling of files and copying of the database from the production server into the dev server. I found that it would be nice to disable certain plugins that I don't want running in the dev instance (ie, plugins that notify search indexes when new posts are made) from within this script.
With all the equipment in the rack it is time to connect everything together. I’ve used a total of 11 back-to-back serial, 12 router-to-switch ethernet and 18 switch-to-switch ethernet connections. All together that makes almost a spaghetti of cabling 
CCIE Home Lab cabling
But with some Rip-Tie strap cable I could organize the cabling in a pretty decent way. Below is the end result, without the console connections.
CCIE Lab Rack