I recently bought a Cisco 2651XM router and a Cisco Catalyst 2950T-24 switch. I’d like to centralize logging without using the main data-carrying network. The 24 port switch has plenty of extra interfaces to use, so I think I can dedicate one port to a separate “logging network” The router doesn’t have an extra interface, but it does have its AUX port. Log analysis.org is a great site for information on logging. A serial sniffer exists with PC Weasel 2000, which allows BIOS access.”]
Source: https://taosecurity.blogspot.com/2003/07/i-recently-bought-cisco-2651xm-router.html