CCNP Study Notes 15-RSTP

lack of spanning tree protocol :

The port must undergo a 30s delay from blocking to forwarding

Fast Spanning Tree 802.1w

With STP all functions, convergence time less than 1s

Compatible with 802.1D, but the convergence time is 30s

features :

1, the root port in the new topology can immediately enter the forwarding state, saving two delay. (Synchronization is required to prevent loops)

2, on the point-to-place link, the specified port can quickly enter the forwarding state by shaking hands with the connected bridge.

Link type, divided into: Peer (full-time delay <1s)

: Shared (connect the hub, etc. delay or 30s)

Note : The handshake must be on the point-to link.

After a handshake, the non-edge specified port of the corresponding handshake's bridge becomes blocking state, and you need to initiate a handshake to your neighbor bridge-the handshake spread

3, the port at the edge of the network, which is connected directly to the terminal, not the port connected to the other bridges

can go directly to the forwarding State, no delay required. Equivalent to Portfast

Port Status:

Discarding (discard)

Learning

Forwarding

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RSTP BPDU Flag

CCNP Study Notes 15-RSTP