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After the experience with a wedged router interface (see prior post: Cisco Router Interface Wedged ), several of us at Netcraftsmen were discussing etherchannel load balancing and what to recommend to customers and how to check the setting in network...
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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...
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After my posting about the dangers of spanning Layer 2 between data centers in my blog titled Spanning Tree Protocol and Failure Domains , Shivlu Jain ( www.mplsvpn.info ) asked about handling requests to span Layer 2 between data centers. One of his...
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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...
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Buffer tuning has long been an interesting topic for me. I recently found a blog post by Brough Turner, who wrote an interesting article about a potential misconfiguration of AT&T wireless routers that cause ping round trip times to be either <...
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Have you ever had a Cisco router or switch shutdown due to a fan failure? While looking through NetMRI 's daily list of analysis issues, I found a Fan Failure issue (it is named "Device Fan Problem" in NetMRI's Analysis page). It was...
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We recently had an interface wedge on a customer router, with some interesting repercussions. The network topology is shown below. Every day from about 8am until 6pm, a 250Mbps - 300Mbps traffic load starts between the Major Facility and the core network...
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While doing some other research recently, I ran across the Bridge Assurance feature in Cisco gear, which was new to me. Cisco has been working on ways to avoid STP melt-down and Bridge Assurance is another tool to help network administrators keep networks...
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Co-worker Pete Welcher recently helped a customer whose network experienced a spanning tree loop (i.e. a melt-down). Several things can be learned from thinking about the experience and how to avoid it. Lesson #1: Adequately plan the task. Rush jobs carry...
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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...
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