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esr-20(config)# spanning-tree max-age 15
esr-20(config)# spanning-tree forward-time 10

esr-20# show spanning-tree active 
Protocol version: STP
          Root ID: [32768] a8:f9:4b:ad:5a:00
                    Root port: [128] gi1/0/1
                    Pathcost 32768
                    Message Age 300
                    Hello time: 2 Max age time: 20 Forward delay: 15
        Bridge ID: [32768] a8:f9:4b:ad:8e:5d
                    Hello time: 2 Max age time: 15 Forward delay: 10
                    Transmit hold count: 6 Topology change: 0
                    Time since topology change: 16 Topology change count: 2
Name           State   Prio.Num   Cost        Status     Role       PortFast   Type                   
------------   -----   --------   ---------   --------   --------   --------   --------------------   
gi1/0/1        en      128.2      32768       FRW        Root       No         STP                    
gi1/0/2        en      128.3      32768       BLK        Altr       No         STP