Switching

Fiber optics and UDLD

René Jorissen on October 20, 2008 0 Comments • Tags: #aggressive #bpdu #detection #fiber #forwarding #learning #link #listening #mode #normal #optics #stp #udld #unidirectional

UDLD (Unidirectional Link Detection) is a protocol to help prevent forwarding loops in switched networks. A fiber cable is build from two separate fibers (transmit and receive), where one of the two fiber could fail, which would result in a switch port not able to receive or send traffic. This scenario could result in some … Read More

Configuration Example, Firewalling

PIX / ASA – Threat Detection

René Jorissen on June 19, 2008 0 Comments • Tags: #80 #asa #basic #detection #intrusion #pix #prevention #scanning #threat

From software release 8.0 and later the Cisco PIX and Cisco ASA firewalls support the feature called Threat Detection. In the default configuration Basic Threat Detection is enabled on the security appliance. Using Threat Detection the appliance monitors the rate of dropped packets and security events due to these reasons (Source): Denial by access lists; … Read More