1. CCNP-SWITCHING 300-115 Mohamed Samir YouTube channel Double CCIEs #27042(R/S&SP)

2. Part III Working with Redundant Links

3. Rapid Spanning Tree Protocol

4. SW2
SW1
FA0/1
FA0/1
FA0/11
FA0/2
FA0/2
FA0/11
FA0/1
FA0/1
FA0/2
FA0/2
SW4
SW3

5. Rapid Spanning Tree Protocol (802.1D)
RSTP can be applied on instance or multiple
Rapid PVST+ (RPVST+) and it can operate with MST as well
Root port: best root path cost to the root
Designated port: best root path cost to the Root
Alternate port: less desirable than that of the root port
Backup port: redundant (but less desirable)
State the port
Discarding:Incoming frames simply are dropped; no MAC addresses are learned
Learning:Incoming frames are dropped, but MAC addresses are learned
Forwarding: Incoming frames are forwarded according to MAC addresses that have been (and are being) learned.

6. BPDUs in RSTP
The BPDU version also is set to 2 to distinguish RSTP BPDUs from 802.1D BPDUs
BPDUs are sent out every switch port at hello time intervals … enhance max age time from 20 sec. to 6 sec.
RSTP and STP are compatible and you can migrate without any disturbance

7. RSTP Convergence You can think of convergence as a two-stage process
1. One common root bridge must be “elected.
2. The state of every switch port
Port Types
Edge port: where only a single host connects “ portfast”
if a BPDU ever is received on an edge port, the port immediately loses its edge port status.
Root port: best cost to the root the other alternative root port
Point-to-point port:
A- Full duplex: STP will be quickly on this link
Half duplex : shared media 802.1D traditional must ne run
Synchronous process done to prevent the loop

8. Synchronization
All port non-edge begin in Discarding state.

10. Topology Changes and RSTP
Traditional STP TCN send by root bridge
topology change (TC) messages propagate
only when a nonedge port transitions to the Forwarding state
BPDUs, with their TC bit set, are sent out all the nonedge designated ports.(two hello interval)
all MAC addresses associated with the nonedge designated ports are flushed

11. RSTP Configuration
By default, a switch operates in Per-VLAN Spanning Tree Plus (PVST+) mode using traditional 802.1D STP
RSTP cannot be used until a different spanning-tree mode (MST or RPVST+)
To configure a port as an RSTP edge port
Switch(config-if)# spanning-tree portfast
It should automatic detect point to point but to force you can use
Switch(config-if)# spanning-tree link-type point-to-point
Switch(config)# spanning-tree mode rapid-pvst
Be careful
STP process that is currently running must be restarted.

12. Any questions ?

13. Thank you for your time ! 
شكرا
جزاكم الله خير