Which platform for RSTP Root?

[clogwood]

I have migrated from a CAT/OS 6513 to a new IOS 4928 / NX-OS 5010 environment.

My final task is to move the RSTP root bridge funcion from the 6513 to a device(s) in the new environment.

Do I move the RSTP root bridge function to the IOS 4928 or to the the NX-OS 5010 switches?

My configuration of switches is listed below.

     "Edge Switches"

         |

Catalyst 4928-1 ----> Nexus 5010-1

                                       ^

                                       |

                                    vPC

                                       |

                                       v

Catalyst 4928-2 ----> Nexos 5010-2

         |

    " Edge Switches"

Your advice is appreciated.

Claude

[glen.grant]

  If the Nexus are your core routing switches then the root should be on those 2 switches.

[smehrnia]

Hi,

adding to Glen's advice, if the connections from 4928 to Nexus switches are Layer 2, then use nexus as your root, if otherwise use 4928's.

Hope it Helps,

Soroush.

[Reza Sharifi]

Nexus OS supports only MST and RPVST+

I believe, Cisco's recommendation is to run MST on Nexus switches since It incorporate RSTP.

have a look:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/layer2/421_n1_1/Cisco_n5k_layer2_config_gd_rel_421_n1_1_chapter2.html#con_1067031

HTH