CCNA 2 - Capitulo 5 - Supplemental Module 1.0

CCNA 2 - Capitulo 5 - Supplemental Module 1.0

1. RAPID SPANNING TREE PROTOCOL (RSTP) 802.1W

   • SUPERSEDES THE ORIGINAL 802.1D (STP)
     • BUT RETAINED BACKWARD COMPATIBILITY
       • 802.1W STP TERMINOLOGY REMAINS PRIMARILY SAME AS THE ORIGINAL 802.1D STP TERMINOLOGY
       • THE SAME ALGORITHM IS USED FOR BOTH STP AND RSTP TO DETERMINE PORT ROLES AND TOPOLOGY
   • RSTP CAN FAST CONVERGENCE A FEW HUNDRED MILLSECONDS
   • CAUTION ? RAPID PVST+ CISCO
     • IMPLEMENTATION OF RSTP ON A PER VLAN BASIS
     • AS INDEPENDENT INSTANCE OF RSTP RUN FOR EACH VLAN
   • DIFFERENCE STP X RSTP
     • RSTP 802.1W
       • BPDU FORWARDING
         • ALL SWITCHES SEND HELLO BPDUs EVERY 2 SECONDS
         • USED AS "KEEPALIVE" MECHANISM
       • PORT STATES RSTP
         • 1.DISABLED
           • HAS BEEN ADMINISTRATEVELY DISABLED BY AND ADMINISTRATOR
           • OR DUE TO A HARDWARE FAILURE
         • 2.DISCARDING
           • SAME AS STP BLOCING STATE
           • IS BLOCKED TO PREVENT LOOPS
           • DOES NOT FORWAD FRAMES
           • LISTENS TO BPDUs TO LEARN THE STP TOPOLOGY
         • 3.FORWARDING
           • INCORPORATE THE LEARNING STATE
           • IMMEDIATELY FORWARDING FRAMES
           • ALSO LEARNS THE MAC OF CONNECTED DEVICE
           • PROCESS BPDUs MONITORING FOR STP TOPOLOGY CHANGES
       • PORT ROLES RSTP
         • ALTERNATE PORT (DISCARDING)
           • ANOTHER PATH IF THE ROOT PORT FAILS
           • ARE IN DISCARDING STATE AND QUICLY TRANSITION TO THE FORWARDING IF
             • ROOT PORT FAILS
           • FOUND ON NON ROOT BRIDGE
         • DESIGNATED PORT (FORWARDING)
           • FORWARD TRAFFIC FROM A SEGMENT TO THE ROOT BRIDGE
           • DETERMINED THROUGH THE BRIDGES ROOT PATH COST AND BRIDGE ID
           • ALL SWITCH WITH STP ENABLED HAVE ONE OR MORE DESIGNATED PORTS
           • ROOT BRIDGE ONLY DESIGNATED PORTS
         • ROOT PORT (FORWARDING)
           • FORWARDS TRAFFIC TO THE ROOT BRIDGE
           • LOWEST PATH COST FROM SWITCH TO THE ROOT BRIDGE
         • BACKUP PORT (DISCARDING)
           • BACKUP TO DESIGNATED PORTS ON A SWITCH
           • DISCARD TRAFFIC AND IMEDIATELY TRANSITION TO THE FORWARDING STATE
             • IF DESIGNATED PORT FAILS
           • ONLY APPLY WHEN HUB IS CONNECTED STP SWITCH
       • TIME TO START FORWARDING FRAMES
         • WITHIN A FEW SECONDS
   • STP 802.1D
     • BPDU FORWARDING
       • ONLY ROOT BRIDGE SENDS BPDU
       • BPDUs ARE RELAYED BY OTHER SWITCHES
     • PORT STATES
       • 5.DISABLE
       • 1.BLOCKING
       • 2.LISTENING
       • 4.LEARNING
       • 5.FORWARDING
     • PORT ROLES
       • DESIGNATED PORT (FORWARDING)
       • ROOT PORT (FORWADING)
       • NON DESIGNATED PORT (BLOCKING)
     • TIME TO START FORWARDING FRAMES
       • UP TO 50 SECONDS WITH DEFAULT TIMER SETTINGS
   • LINK TYPES AND EDGE PORTS
     • LINK TYPE
       • AS DETERMINED BY THE PORT DUPLEX MODE
         • FULL DUPLEX
           • INDICATES A P2P LINK
             • POINT TO POINT
         • HALF DUPLEX
           • INDICATE SHARED PORT
             • SHARED
     • EDGE PORT
       • ACCESS PORT CONNECTING TO ONE DEVICE (HOST , SERVER , AP)
       • TRANSICTION FORWARDING STATE WHEN ENABLED
         • SKKIPIING THE LISTENING AND LEARNING STAGES