Cisco has taken a leaf out of Microsoft's book by adopting a regular patch release cycle. However, the change will apply only to security bugs involving its core IOS software and not all its products.

Starting on 26 March, Cisco will release bundles of IOS security advisories on the fourth Wednesday of March and September in each calendar year.

http://www.theregister.co.uk/2008/03/06/cisco_patch_cycle/

:-)

Urs