Switching

Cisco Spanning Tree Scalability

René Jorissen on January 12, 2012 0 Comments • Tags: #cisco #scalability #spanning #spanningtree #stp #tree

A colleague (Twitter: @Toonieh) mentioned spanning-tree scalability in a Cisco network. He had an article about this matter. All the credits on this post go to him. I found the article on internet and post it here to be able to find it quickly.. In a Layer 2 looped topology design, spanning tree processing instances … Read More

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