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Nexus 5000 IOS upgrade

Hi:

i am upgrading Nexus 5000 IOS first time. when i  check upgrade impact , i am getting the upgrade is disruptive. can any body guide me what does it mean. Is it minor impact or need a switch reload.

Thanks for you time.

Compatibility check is done:
Module  bootable          Impact  Install-type  Reason
------  --------  --------------  ------------  ------
     1       yes      disruptive         reset  STP ISSU preupgrade check failed
 - Upgrade needs to be disruptive!



Images will be upgraded according to following table:
Module       Image         Running-Version             New-Version  Upg-Required
------  ----------  ----------------------  ----------------------  ------------
     1      system            5.1(3)N2(1c)             5.2(1)N1(9)           yes
     1   kickstart            5.1(3)N2(1c)             5.2(1)N1(9)           yes
     1        bios        v1.2.0(06/19/08)        v1.5.0(11/30/10)           yes
     1   power-seq                    v1.2                    v1.2            no


Additional info for this installation:
--------------------------------------
Remove QoS & ACL config on L3 interfaces and SVIs if any

Service "stp" : Port: port-channel11 in VLAN0001 is Designated. Topology change
could occur during ISSU.
Upgrade needs to be disruptive!!!

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