Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 468

www.dell.com | support.dell.com To confirm that a port is participating in RST, use the show spanning-tree rstp brief command from EXEC privilege mode (Figure 27-6). Figure 27-6. show spanning-tree rstp brief Command Example FTOS#show spanning-tree rstp brief Executing IEEE compatible Spanning Tree Protocol Root ID Priority 32768, Address 0001.e801.cbb4 Root Bridge hello time 2, max age 20, forward delay 15 Bridge ID Priority 32768, Address 0001.e80f.1dad Configured hello time 2, max age 20, forward delay 15 Bpdu filter disabled globally Interface Name ---------TenGig 3/1 TenGig 3/2 TenGig 3/3 TenGig 3/4 PortID -------128.681 128.682 128.683 128.684 Prio ---128 128 128 128 Cost ------20000 20000 20000 20000 Sts --BLK BLK FWD BLK Designated Cost Bridge ID 20000 32768 0001.e80b.88bd 20000 32768 0001.e80b.88bd 20000 32768 0001.e801.cbb4 20000 32768 0001.e801.cbb4 PortID ----128.469 128.470 128.379 128.380 Interface Name ---------TenGig 3/1 TenGig 3/2 TenGig 3/3 TenGig 3/4 FTOS# Role PortID Altr 128.681 Altr 128.682 Root 128.683 Altr 128.684 Prio ---128 128 128 128 Cost ------20000 20000 20000 20000 Sts --- BLK BLK FWD BLK Cost Link-type 20000 P2P 20000 P2P 20000 P2P 20000 P2P Edge ------- No No No No Bpdu Filter -------- No No No No Add and Remove Interfaces • To add an interface to the RST topology, configure it for Layer 2 and it is automatically added. If you previously disabled RSTP on the interface using the command no spanning-tree 0, re-enable it using the spanning-tree 0 command. • To remove an interface from the RST topology, use the no spanning-tree 0 command. For bridge protocol data units (BPDU) filtering behavior, refer to Removing an Interface from the Spanning Tree Group. Modify Global Parameters You can modify the RST parameters. The root bridge sets the values for forward-delay, hello-time, and max-age, and overwrites the values set on other bridges participating in the RST group. • Forward-delay is the amount of time an interface waits in the Listening State and the Learning State before it transitions to the Forwarding State. • Hello-time is the time interval in which the bridge sends RSTP bridge protocol data units (BPDUs). 466 | Rapid Spanning Tree Protocol (RSTP)