Dell Force10 C150 Manual page 33

Deploying the Dell Force10 MXL into a Cisco Nexus Network Environment
As mentioned previously the Nexus switches can run in one of two Spanning Tree modes, MSTP or Rapid
PVST+
Here is the command for configuring the Nexus Switches to run MSTP:
N5K2#configure
N5K2 (conf)#spanning-tree mode mst
N5K2 (conf)#exit
N5K2#
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 the
configuration, before configuring MSTP.
Determine if Spanning Tree is already enabled
In this example, RSTP was already running so it was disabled before configuring MSTP.
MXL2#show run | grep spanning
protocol spanning-tree rstp
MXL2#configure
MXL2#protocol spanning-tree rstp
MXL2(conf-rstp)#disable
MXL2(conf-rstp)#exit
MXL2(conf)#no protocol spanning-tree rstp
MXL2(conf)#exit
MXL2#
Enable MSTP Spanning Tree on the MXL
Here are the commands to configure MSTP:
MXL2#configure
MXL2(conf)#protocol spanning-tree mstp
MXL2(conf-pvst)#no disable
MXL2(conf-pvst)#exit
MXL2(conf)#exit
MXL2#
Verify that Spanning Tree is Running as Expected
What is shown below as a result of the show spanning-tree command is:
1) The MXL's MSTP has converged with the Nexus switches and has accepted N5K1 as the Root Bridge
with its Priority of 24576
2) Interface 1/43 has a status of Blocking and is in the Role of Alternate
3) Interface 1/45 has a status of Forwarding and is in the Role of Root.
4) Given that 1/45 has the lowest path cost to the Root Bridge, this is the expected topology
MXL2#show spanning-tree msti 0 brief
MSTI 0 VLANs mapped 1-4094
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