Monthly Archives: October 2014

RSTP and Fast Convergence

*+-Fast Convergence for Designated Ports RSTP protocol’s fast convergence depends on the use of point-to-point links connecting switches. In order to quickly transition a designated port into non-discarding state, the upstream switch needs to make sure that the downstream neighbor

Posted in CCIE R&S

RSTP – Spanning Tree

*+-So…Spanning Tree didn’t converge quickly enough for some people, and enabling PortFast everywhere kind of defeats the purpose, so 802.1w Rapid Spanning Tree was born. RSTP in essence puts into place some additional features to speed up STP reconvergence. Old-school

Posted in CCIE R&S

End to end FCoE troubleshooting check with UCS, Nexus 5000 etc.

*+-UCS: *  FCoE port channel created?  assigned the right vsan? * fcoe vlan created and mapped to vsan? N5k/MDS/upstream FCoE switch: * Ethernet port up? in port channel? allow the fcoe vlan? * vlan created? *vsan created in vsan database?

Posted in CCIE Datacenter

FCoE NPIV NPV port channel between n5k and n7k

*+-Sample config for  FCoE NPIV NPV port channel between n5k and n7k , you are going to have a hard time troubleshooting why your vsan is stuck at initializing if you miss some of the commands~ =====n7k==== feature lldp   —–>

Posted in CCIE Datacenter