Sec 22 RSTP

RSTP: Rapid Spanning Tree Protocol (802.1w)

Compare to 30 second delay in STP, RSTP is faster. It require root bridge. Second switch to root goes to alternate mode and act as backup.

Point-to-Point (PTP) port needs to be full-duplex. edge-port is the end-client, switch forware packets to non-edge ports.

RSTP switch generates BPDU every 2 seconds. It ages when there is no 3 BPDU message (6 seconds).

change STP to RSTP

SW1(config)#spanning mode rapid-pvst

Display STP status

SW1#show spanning summary