Dell Force10 C150 Manual

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Deploying the Dell Force10 MXL into a Cisco Nexus Network Environment38Root Bridge. This scenario was observed with only a single ping being lost during the failback,indicating that the re-convergence took about 1 second.3) Failover: Backbone Failure Simulation (Backbone Fast). In this test a shutdown was issued onN5K1’s interface 1/25. This caused MXL2 to place its interface 1/43 interface into the Role ofDesignated. This scenario was observed with only a single ping being lost, indicating that there-convergence took about 1 second.4) Failback: Backbone Failure Simulation (Backbone Fast). ). In this test a no shutdown wasissued on NX5K1’s interface 1/25. This caused STP on MXL2 to place its interface 1/43 into aRole of Alternate. This scenario was observed with only a single ping being lost, indicating thatthe re-convergence took about 1 second.Nexus MSTP and MXL MSTP – Greater than 64 InstancesThe Force10 MXL supports up to 64 MSTIs (Multiple Spanning Tree Instances). MSTI 0 is reserved forthe CIST (Common Internal Spanning Tree) leaving Multiple Spanning Tree Instances 1 – 63 on whichVLANs can be assigned. In the event that the Nexus switches are using more than 64 Instances, thenthe question arises regarding how to configure and interoperate with the Force10 MXL bladeswitch. The best practice is that VLANs assigned to instances greater than 63 on the Nexusswitches, should be left to default to MSTI 0 (Common Internal Spanning Tree) on the Force10 MXLblade switch. The previous six tests were conducted in 2 MSTP environments:1) VLANs on Multiple Spanning Tree Instances in the 1 – 63 range.2) VLANs left on Multiple Spanning Tree Instance 0 (CIST) as the Instance numbers as assignedon the Nexus switches could not be matched since they were greater than 63.The failover / failback results described above were observed in both environments.Nexus Rapid PVST+ and MXL PVST ObservationsAs previously mentioned, the Nexus switches can run in one of two Spanning Tree modes, MSTP orRapid PVST+Here is the command for configuring the Nexus Switches to run Rapid PVST+:N5K2#configureN5K2 (conf)#spanning-tree mode rapid-pvstN5K2 (conf)#exitN5K2#The process for configuring the MXL switch to run MSTP:First, check to see if STP is already configured. If it is, then disable and remove it from theconfiguration, before configuring PVST.Determine if Spanning Tree is already enabledIn this example, RSTP is already running so it was disabled before configuring PVST.MXL2#show run | grep spanningprotocol spanning-tree rstpMXL2#configureMXL2#protocol spanning-tree rstp