BCMSN: RSTP Configuration
Posted by Aragoen Celtdra on 22nd June 2009
Configure RSTP
- In the traditional 802.1D spanning tree protocol, a switch operates in Per-Vlan Spanning Tree Plus (PVST+).
- In order to use RSTP, the spanning-tree mode must changed.
- The following interface configuration command makes sure that a port operates as an RSTP edge port:
Switch(config-if)#spanning-tree portfast
- This configuration is the same PortFast feature in 802.1D that ensures the port transitions automatically from blocking to forwarding.
- Recall that a port that is operating in full-duplex mode is automatically considered by the switch point-to-point.
- To manually override the automatic determination, use the following interface config command:
Switch(config-if)#spanning-tree link-type point-to-point
Rapid Per-Vlan Spanning Tree Protocol (RPVST+)
- As we mentioned above, PVST+ is the default STP mode on Catalyst switches.
- This mode allows one spanning tree instance for each VLAN active on the switch.
- To use the more efficient RSTP mode, configure the switch to begin using the Rapid PVST+ (RPVST+) mode using the following global configuration command:
Switch(config)#spanning-tree mode rapid-pvst
- When this configured on a production network, any STP process is restarted.
To configure the switch back to PVST+ mode, use:
Switch(config)#spanning-tree mode pvst
To verify the STP mode, use the following command:
Switch#show spanning-tree vlan vlan-id
This entry is not an authoritative guide. These are merely notes and rehash of the primary text materials and resources that I use. For a thorough guide of the BCMSN course, consider purchasing Building Cisco Multilayer Switched Networks (BCMSN) (Authorized Self-Study Guide) (4th Edition)by Richard Froom, Balaji Sivasubramanian, and Erum Frahim and CCNP BCMSN Official Exam Certification Guide (4th Edition) by Dave Hucaby ; as well as following the links on the reference section of this entry.
Posted in BCMSN Prep, CCNP, Spanning Tree | No Comments » | 