Vlan

Migrating CSM Serverfarms to Other Server VLANs

2010-01-25 ·3 min read

A coworker brought an interesting problem to me the other day. He wanted to move a serverfarm from one server VLAN to another without taking an outage. Since I didn’t want to have to come into …

cisco csm datacenter dcoas mdcoas migration stick vlan

An Interesting Problem with Multiple DCs on a Stick

2009-03-24 ·3 min read

We talked about running multiple data centers on a stick back in August, which is where you have multiple logical pairs of client and server VLANs on a single CSM for different tiers or functions. The …

client csm datacenter linux rip route server vip vlan vserver

RSPANs on Cisco Switches

2009-03-18 ·3 min read

We discussed SPANs earlier, but let’s talk about RSPANs for a bit. Can anyone guess what the “R” means? You guessed it – “Remote”. An RSPAN is a way to get traffic …

cisco remote rspan span switch vlan

VLANs on Linux

2009-02-19 ·4 min read

My home network has a Linux box running IPTables as it’s center point, and, since there are four networks, it has 4 NICs and 4 cables into the switch. I kept running into problems with the NICs …

dot1q lan linux switch trunk vlan

VTP and You

2008-04-16 ·3 min read

VLAN Trunk Protocol (VTP) is a little gem on Cisco switches that allows you configure VLANs in one place and have them appear on all of your switches. This is great for large enterprises with 8457839 …

lan switching vlan vtp

Setting Up VLANs on an ASA 5505

2008-04-01 ·4 min read

I’ve had my ASA 5505 in place at home on my Comcast cable for a few weeks now, and, let me tell you, this thing rocks. I did, however, have a few problems finding a clear answer on how I could …

asa firewall switching trunking vlan

Ideas That Seems Good At the Time

2007-09-12 ·2 min read

When I started in IT, I tried to get my gear as standardized as possible to impress everyone. I worked at it and worked at it until I realized that there were a handful of things that sound good but …

cable port vlan