Cisco WS-C4003 Software Guide - Page 122
Mapping VLANs to a MISTP Instance, Determining MISTP Instance-VLAN Mapping Conflicts
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Using MISTP-PVST+ or MISTP Chapter 7 Configuring Spanning Tree Mapping VLANs to a MISTP Instance When you are using MISTP-PVST+ or MISTP on a switch, you must map at least one VLAN to a MISTP instance in order for MISTP-PVST+ or MISTP to be active. Note See Chapter 10, "Configuring VLANs" for details on using and configuring VLANs. • You can only map Ethernet VLANs to MISTP instances. • At least one VLAN in the instance must have an active port in order for MISTP-PVST+ or MISTP to be active. • You can map as many Ethernet VLANs as you wish to a MISTP instance. • You cannot map a VLAN to more than one MISTP instance. To map a VLAN to a MISTP instance, perform this task in privileged mode: Step 1 Step 2 Task Map a VLAN to a MISTP instance. Verify that the VLAN is mapped. Command set vlan vlan mistp-instance instance show spantree mistp-instance [instance] [active] mod/port This example shows how to map a VLAN to a MISTP instance 1 and verify the mapping: Console> (enable) set vlan 6 mistp-instance 1 Vlan 6 configuration successful Console> (enable) show spantree mist-instance 1 Instance 1 Spanning tree mode MISTP-PVST+ Spanning tree type ieee Spanning tree instance enabled Designated Root 00-d0-00-4c-18-00 Designated Root Priority 49153 (root priority: 49152, sys ID ext: 1) Designated Root Cost 0 Designated Root Port none VLANs mapped: 6 Root Max Age 20 sec Hello Time 2 sec Forward Delay 15 sec Bridge ID MAC ADDR Bridge ID Priority VLANs mapped: Bridge Max Age 20 sec 00-d0-00-4c-18-00 49153 (bridge priority: 49152, sys ID ext: 1) 6 Hello Time 2 sec Forward Delay 15 sec Port Inst Port-State Cost Prio Portfast Channel_id 2/12 1 forwarding 22222222 40 disabled 0 Determining MISTP Instance-VLAN Mapping Conflicts A VLAN can only be mapped to one MISTP instance. If you attempt to map a VLAN to more than one instance, all of its ports are set to blocking mode. You can use the show spantree conflicts command to determine to which MISTP instances you have attempted to map the VLAN. 7-26 Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 78-12647-02