Stuff…

I wanted to default the configuration of a number of ports on an old Cisco 3548. The latest version of IOS support on this system does not support the range command, so, had to manually run a small script (bash 1 liner on linux) and paste in the contents:
$ for i in `seq 40 [...]

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Found this FAQ useful to understand the different modules available for the line cards:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_qanda_item09186a00809a7673.shtml
No doubt the Cisco link will change at some time so here is the PDF:
C6K_PFC_DFC_CFC

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Just some URLs about Cisco GBICs that I want to look at later:

Cisco SFP Optics For Gigabit Ethernet Applications [Cisco Transceiver Modules] – Cisco Systems

Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix – Cisco Systems

Cisco Gigabit Interface Converter [Cisco Transceiver Modules] – Cisco Systems

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Using an old switch cisco C3548XL switch the CPU load was increasing gradually over a few months.  Looking at the output of show proc the TTY Background process was usings 30-40% CPU load and the system overall was at 80-90%.
This caused some increased ping times, but, switching to the other machines on the switch was [...]

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URLs: http://www.ciscopress.com/articles/article.asp?p=336872
The above url discusses how to trouble shoot unicast flooding issues on a layer 2 network and methods for stopping such flooding.

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