Terry's Blog

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• auto-negotiation
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• CiscoLive2010
• Configuration management
• duplex setting
• ethernet
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• interface down
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• HSRP Preempt Delay

  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... Posted Jul 23 2010, 09:24 AM by tslattery with | with no comments Filed under: high availability, Featured, CiscoLive2010, HSRP, resilient networks

• Tracking Key Interface State

  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... Posted Mar 01 2010, 01:58 PM by tslattery with | with no comments Filed under: high availability, Featured, redundancy, interface down

• Auto-negotiate Duplex or not?

  I've done a number of network assessments in which I find that the customer insists on manually configuring the interfaces for full duplex. I did a little research on the topic and found an interesting paper by Jim Eggers and Steve Hodnett at Sun... Posted Dec 05 2009, 04:33 PM by tslattery with | with 2 comment(s) Filed under: high availability, duplex setting, ethernet, auto-negotiation

• Network Availability and High Availability Networks

  Scott Hogg of Global Technology Resources (GTRI) did a nice blog post for Network World way back in April, 2009 about High Expectations of Network Availability (http://www.networkworld.com/community/node/40827) and a slightly more recent one in May, "... Posted Dec 05 2009, 02:44 PM by tslattery with | with no comments Filed under: high availability, Configuration management, network configuration

• High Availability Networking (>5-nines)

  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... Posted Aug 17 2009, 01:28 PM by tslattery with | with 1 comment(s) Filed under: high availability, Featured, failure domains, redundancy, spanning tree

• Reachability SLA and SNMP Data Collection

  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... Posted Jun 13 2009, 02:09 PM by tslattery with | with 1 comment(s) Filed under: reports, high availability, Featured, SLA, reachability

• Cisco Technical Design Days

  I attended a Cisco event yesterday titled "Cisco Tech Days." It was an all-day seminar by Cisco SEs on two areas of technology: Advanced Campus Topics Branch-WAN Topics It was a good day of presentations (I stuck with the Advanced Campus track... Posted Jun 11 2008, 10:10 AM by tslattery with | with no comments Filed under: cisco, network design, Tech Days, Networkers, high availability