Terry's Blog

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• Saving Cisco Router Configuration

  As I write this, we're going through another "snow event", with a forecast of high winds and 10-20 inches of snow to top the 24-36 inches that fell a few days ago - over 67 inches so far this year, which has broken all snowfall records for... Posted Feb 10 2010, 12:52 PM by tslattery with | with no comments Filed under: Configuration management, Featured, saving cisco router configuration, command execution

• Identifying Unsaved Running Configurations

  Have you ever lost a device configuration because you forgot to save it to NVRAM and the device later rebooted, perhaps due to a power outage? More than likely some feature or function that had been operating correctly since the last change suddenly stopped... Posted Dec 21 2009, 10:35 AM by tslattery with | with no comments Filed under: Configuration management, Featured, config diff, config archive

• Saved by the Configuration Repository!

  We recently had a near-disaster occur at a customer. A 6500 10/100 ethernet blade had died and was replaced. When the replacement blade was installed, the configuration for its interfaces disappeared from the configuration! The techs couldn't figure... Posted Dec 05 2009, 03:51 PM by tslattery with | with no comments Filed under: Configuration management, NCCM, Configuration Repository

• 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

• Config Policy and Operational Data

  I've written before in Subsystem Configuration Policy Check about incorporating operational data with configurations for performing configuration compliance validation. Another example, with a different twist to it, occurred last week while creating... Posted May 12 2009, 09:15 AM by tslattery with | with no comments Filed under: compliance, Configuration management, Featured, policy

• Device and Interface Groups Aid Config Policy

  Networks use the same devices in many different roles, so configuration validation based on device type isn't sufficient. There are some configuration things that can be checked across all the devices of a certain type in your network, such as checking... Posted Mar 25 2009, 11:38 AM by tslattery with | with no comments Filed under: network analysis, Configuration management, Featured, configuration policy, device groups, interface groups

• Configuration Policy Validation

  My previous post talked about the basics of verifying a configuration prior to deployment as a way to minimize the number of incorrect configurations that are fielded. The second topic, which is closer to the original NANOG posting comments, is with respect... Posted Mar 13 2009, 11:03 AM by tslattery with | with no comments Filed under: compliance, network analysis, Configuration management, Featured, configuration policy

• NANOG Posting on Configuration Analysis

  The North American Network Operators Group (NANOG) email list just had an interesting exchange about configuration management. Someone asked: For auditing, is there any Cisco Router/Switch configuration analysis tool? Someone else replied: Depends on... Posted Mar 09 2009, 11:09 AM by tslattery with | with no comments Filed under: Configuration management, Featured, configuration policy, config diff

• Subsystem Configuration Policy Check

  I'm working on a network that requires configuration checks be performed. For some of the subsystems, that's pretty easy because the configuration is done per device and there are no external dependencies. For example, the desired SNMP, logging... Posted Dec 08 2008, 12:57 PM by tslattery with | with 2 comment(s) Filed under: Configuration management, Featured, configuration update, configuration policy

• Configuration Repository - Why It's Important

  Bruce Enders of Chesapeake Netcraftsmen recounts a story that demonstrates why configuration repositories and monitoring configuration changes are valuable. A Netcraftsmen customer called on a Saturday morning to ask about a network problem. Bruce gave... Posted Oct 31 2008, 01:43 PM by tslattery with | with no comments Filed under: change management, Configuration management, Featured, Configuration Repository