I learned something new at CiscoLive: hsrp preempt delay and why it should be used. In the Resilient Campus Design session, the presenter discussed factors and configurations that make a network more resilient. HSRP is often used in campus networks as a first hop redundancy protocol. If one router or...

The Baltimore-Washington area has been hit with several significant snow storms this winter and those storms have impacted the operations of a large metropolitan area network. Problems range from power outages at some sites to link problems between sites. The result is that a large number of interface...

One of the best sessions I attended at CiscoLive this year was titled "BRKRST-3365, Unified HA Network Design: The Evolution of the Next Generation Network" by John Cavanaugh, Chris Cornwall, and a whole team of contributors. They talked about the High Availability (HA) network designs that...

Some network management systems track reachability by pinging network devices. In fact, at a Networkers a few years ago, the Cisco IT team talked about using 5 second pings to measure network availability (what I prefer to call reachability) in the Cisco corporate network. In addition to pings, most...