Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 473
SNMP Traps for Root Elections and Topology Changes, Fast Hellos for Link State Detection
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Figure 27-9. bridge-priority Command Example FTOS(conf-rstp)#bridge-priority 4096 FTOS(conf-rstp)#2d0h22m: %STKUNIT3-M:CP %SPANMGR-5-STP_ROOT_CHANGE: RSTP root changed. My Bridge ID: 4096:001e.c9f1.00cf Old Root: 32768:0001.e88a.fdb3 New Root: 4096:001e.c9f1.00cf Old root bridge ID New root bridge ID SNMP Traps for Root Elections and Topology Changes To enable SNMP traps for RSTP, MSTP, and PVST+ collectively, use the snmp-server enable traps xstp command. Fast Hellos for Link State Detection Use RSTP fast hellos to achieve sub-second link-down detection so that convergence is triggered faster. The standard RSTP link-state detection mechanism does not offer the same low link-state detection speed. RSTP fast hellos decrease the hello interval to the order of milliseconds and all timers derived from the hello timer are adjusted accordingly. This feature does not inter-operate with other vendors, and is available only for RSTP. To configure the hello time, use the following command: Task Command Syntax Configure a hello time on the order of milliseconds. hello-time milli-second interval Range: 50 - 950 milliseconds FTOS(conf-rstp)#do show spanning-tree rstp brief Executing IEEE compatible Spanning Tree Protocol Root ID Priority 0, Address 0001.e811.2233 Root Bridge hello time 50 ms, max age 20, forward delay 15 Bridge ID Priority 0, Address 0001.e811.2233 We are the root Configured hello time 50 ms, max age 20, forward delay 15 Command Mode PROTOCOL RSTP Note: The hello time is encoded in BPDUs in increments of 1/256ths of a second. The standard minimum hello time in seconds is 1 second, which is encoded as 256. Millisecond hello times are encoded using values less than 256; the millisecond hello time equals (x/1000)*256. When you configure the millisecond hellos, the default hello interval of two seconds is still used for edge ports; the millisecond hello interval is not used. Rapid Spanning Tree Protocol (RSTP) | 471
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