Company transportation….
Today I am working at a customer who has two locations in a very very small town. The “head quarters” is located in the center of town and the factory is located outside the town. On both locations I have to replace all network components, so there is some traveling between both locations. So one … Read More
IEEE 802.3x FlowControl between Cat3750E and Cat2960
I have a network with two Catalyst 3750E switch stacks, which are connected with a 2 x 10Gbps Etherchannel. Every stack facilitates a ring topology of approximately 10 to 15 Catalyst 2960 switches. Two of the 2960 are connected with 1Gbps links to a switch stack to create the ring topology. So lets say that … Read More
Telnet Time-Out is killing me….
Aaarrrgggghhh, I hate it when I would like to telnet into a device and enter the wrong IP address. This means, by default, waiting for 30 seconds before being able to correct the IP address and start a new telnet session, because there is no escape sequence. SW01#telnet 10.100.12.250 Trying 10.100.12.250 … % Connection timed out; … Read More
What is an UPLINK port?
A colleague recently encountered some problems with keepalives on switch ports. He wrote a post about it. Keepalives are, quoted from his blog post: By default Cisco routers and switches periodically test their (Fast) Ethernet links by sending out Loopback frames (ethertype 0×9000) addressed to themselves. Call it a “L2 self-ping” if you will. In … Read More
Alias IOS Command
When configuring a router I often use different show commands to check or troubleshoot the configuration. I always hate to type in the whole show command, so I use aliases instead. Aliases are also used in the Open Source community, when working with a terminal. There are multiple options for the alias command, lets take … Read More
DSL Terminology
When configuring DSL or other analog connection, I sometimes have problems with the specific terminologies used in these technologies. I found a post explaining the terminology used for understanding Cisco DSL statistics. Reading this post helps me remember the terminology. Taken from the post: To troubleshoot Layer 1 problems, you can use the show dsl … Read More