OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Create instances

You can create multiple MSTP instances and map VLANs. A single MSTI provides no more benefit than RSTP. To take full advantage of the MST protocol, create multiple MSTIs and map VLANs to them.

  1. Enter an instance number in CONFIGURATION mode.
    spanning tree mst configuration
  2. Enter the MST instance number in MULTIPLE-SPANNING-TREE mode (0 to 63).
    instance 
                                           instance-number
                                        
  3. Enter the VLAN and IDs to participate in the MST instance in MULTIPLE-SPANNING-TREE mode (1 to 4096).
    instance 
                                           vlan-id
                                        

Create MST instances

OS10(config)# spanning-tree mst configuration
                                 OS10(conf-mst)# name force10
                                 OS10(conf-mst)# revision 100
                                 OS10(conf-mst)# instance 1 vlan 2-10
                                 OS10(conf-mst)# instance 2 vlan 11-20
                                 OS10(conf-mst)# instance 3 vlan 21-30
                              

View VLAN instance mapping

OS10# show spanning-tree mst configuration
                                 Region Name: force10
                                 Revision: 100
                                 MSTI    VID
                                 0       1,31-4093
                                 1       2-10
                                 2       11-20
                                 3       21-30
                              

View port forwarding/discarding state

OS10# show spanning-tree msti 0 brief
                                 Spanning tree enabled protocol msti with force-version mst
                                 MSTI 0 VLANs mapped 1,31-4093
                                 Executing IEEE compatible Spanning Tree Protocol
                                 Root ID    Priority 32768, Address 3417.4455.667f
                                 Root Bridge hello time 2, max age 20, forward delay 15, max hops 20
                                 Bridge ID    Priority 32768, Address 90b1.1cf4.a523
                                 Configured hello time 2, max age 20, forward delay 15, max hops 20
                                 CIST regional root ID Priority 32768, Address 90b1.1cf4.a523
                                 CIST external path cost 500
                                 Interface                                              Designated
                                 Name             PortID  Prio  Cost     Sts   Cost  Bridge ID    PortID
                                 -----------------------------------------------------------------------------------
                                 ethernet1/1/1   128.260  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.260
                                 ethernet1/1/2   128.264  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.264
                                 ethernet1/1/3   128.268  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.268
                                 ethernet1/1/4   128.272  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.272
                                 ethernet1/1/5   128.276  128   500       FWD   0    32768   3417.4455.667f  128.146
                                 ethernet1/1/6   128.280  128   500       BLK   0    32768   3417.4455.667f  128.150
                                 ethernet1/1/7   128.284  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.284
                                 ethernet1/1/8   128.288  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.288
                                 ethernet1/1/9   128.292  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.292
                                 ethernet1/1/10  128.296  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.296
                                 ethernet1/1/11  128.300  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.300
                                 ethernet1/1/12  128.304  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.304
                                 ethernet1/1/13  128.308  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.308
                                 ethernet1/1/14  128.312  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.312
                                 ethernet1/1/15  128.316  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.316
                                 ethernet1/1/16  128.320  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.320
                                 ethernet1/1/17  128.324  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.324
                                 ethernet1/1/18  128.328  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.328
                                 ethernet1/1/19  128.332  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.332
                                 ethernet1/1/20  128.336  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.336
                                 ethernet1/1/21  128.340  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.340
                                 ethernet1/1/22  128.344  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.344
                                 ethernet1/1/23  128.348  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.348
                                 ethernet1/1/24  128.352  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.352
                                 ethernet1/1/25  128.356  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.356
                                 ethernet1/1/26  128.360  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.360
                                 ethernet1/1/27  128.364  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.364
                                 ethernet1/1/28  128.368  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.368
                                 ethernet1/1/29  128.372  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.372
                                 ethernet1/1/30  128.376  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.376
                                 ethernet1/1/31  128.380  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.380
                                 ethernet1/1/32  128.384  128   200000000 BLK   0    32768   90b1.1cf4.a523  128.384
                                 Interface
                                 Name             Role   PortID    Prio  Cost      Sts   Cost  Link-type Edge
                                 --------------------------------------------------------------------------
                                 ethernet1/1/1    Disb   128.260   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/2    Disb   128.264   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/3    Disb   128.268   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/4    Disb   128.272   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/5    Root   128.276   128   500       FWD   0     AUTO      No
                                 ethernet1/1/6    Altr   128.280   128   500       BLK   0     AUTO      No
                                 ethernet1/1/7    Disb   128.284   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/8    Disb   128.288   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/9    Disb   128.292   128   200000000 BLK   0     AUTO      No
                                 ethernet1/1/10   Disb   128.296   128   200000000 BLK 
                              

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