HSRP – Hot Stand By Router Protocol
If you’ve been working with Cisco gear for any period of time you likely know what HSRP is. HSRP is the Cisco proprietary FHRP (first hop redundancy protocol). It allows… Read more »
Cisco ASA upgrade… what a pain…
Some of you might have noticed that my site was down for about 30 minutes today. I decided it was time to upgrade my firewall code since I hadn’t done… Read more »
Proxy ARP (PARP)
Proxy ARP is an often overlooked IP service that can be really useful if applied correctly. Proxy ARP allows a routed interface to reply to ARP requests that it normally… Read more »
Dynamic Trunking Protocol (DTP)
DTP is a means for switch ports to automatically form and negotiate trunks. Another feature that you don’t see used very often in large enterprise networks, but it still needs… Read more »
Private VLANs (PVLANs)
Private VLANs are another concept that is pretty easy to understand if you have a good understanding of how VLANs in general work. PVLANs are mostly used in larger multi-tenant… Read more »
VTP (VLAN trunking protocol)
This should be a quick one. If you are studying for your CCIE, you’ve likely heard of the horrors of VTP. I for one, haven’t ever worked anywhere that used… Read more »