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Day 1 - Coggle Diagram

- - - - lowest link cost is prefered
      - can be manually assigned
      - by default is calculate based on bandwitdh
        
        cost is inversely proportional to the bandwidth
      - exchange info using BPDU
  - - - type of port roles
        
        designated port
        
        offer shortest path root switch
        
        per segment/uplink
        
        root port
        
        sames as designated port , offer shortest path to root switch
        
        per non-root switch
    - - root switch
        
        Act as reference point for calculate best path
        
        Auto elect 1 based on lowest switch ID
        
        Consist of sw priority
        
        default switch priority is 32769
        
        can be changed
        
        MAC address of the sw
        
        This one can't be changed
        
        lowest swtich ID become root switch
        
        can configure a secondary root switch
  - - - Make port errordisable if receive BPDU
      - To recover
        
        1, shut/no shut
        
        Make it auto recover
  - - - tate Forward Frames Learn MAC Addresses Duration
      - Blocking is seconds
      - Listening is 15 seconds
      - Learning is 15 seconds
      - Forwarding Yes Yes –
    - - , The message age is not a fixed value. The root bridge sends all its BPDUs with a message age value of 0, and all subsequent switches add 1 to this value. Effectively, this value contains the information on how far you are from the root bridge when you receive a BPDU
      - https://www.cisco.com/c/en/us/support/docs/lan-switching/spanning-tree-protocol/19120-122.html
      - f this age timer reaches max age before another BPDU is received that refreshes the timer, the information is aged out for that port.
- - - - use ARP to learn next hop MAC address
- - - - provide subsecond failover
- - - - IGMP snooping or CGMP ( on switch) can stop flooding