Stack Cisco 2960x con Cisco 2960s

Cuando lees las tech specs de los 2960x pone que el flex stack es compatible con los 2960s pero cuando toca conectarlos empiezan los problemas. Cisco lo tiene documentado (aqui) pero no es facil de enontrar, voy a dejar un resumen

Si tenemos un stack de 2960s, se nos rompe un switch y tenemos que cambiarlo por un 2960x tenemos que seguir el siguiente proceso

1.- Mismo IOS, tenemos que actualizar los 2960s a una versión igual a la que tengan o la que queramos que tegan los 2960x, lo cual requiere un reboot

2.- Misma plantilla, se comprueba que plantilla están corriendo con show sdm prefer. Si hay que cambiarla
2960s#show sdm prefer
 The current template is "desktop default" template.
 The selected template optimizes the resources in
 the switch to support this level of features for
 8 routed interfaces and 1024 VLANs.

  number of unicast mac addresses:                  6K
  number of IPv4 IGMP groups + multicast routes:    1K
  number of IPv4 unicast routes:                    8K
    number of directly-connected IPv4 hosts:        6K
    number of indirect IPv4 routes:                 2K
  number of IPv4 policy based routing aces:         0
  number of IPv4/MAC qos aces:                      0.5K
  number of IPv4/MAC security aces:                 1K

2960s(config)#sdm prefer ?
  access              Access bias
  default             Default bias
  dual-ipv4-and-ipv6  Support both IPv4 and IPv6
  routing             Unicast bias
  vlan                VLAN bias

por ejemplo la dejamos con default  

2960s(config)#sdm prefer default
requiere un reinicio

3.- Puerto de stack forzado a 10Gb/s en el 2960x (switch stack port-speed 10), require tercer reboot
2960x(config)#switch stack port-speed 10
ya los podemos unir 

Switch Ports Model              SW Version            SW Image                
------ ----- -----              ----------            ----------              
*    1 28    WS-C2960X-24PS-L   15.0(2)EX5            C2960X-UNIVERSALK9-M    
     2 28    WS-C2960S-24PS-L   15.0(2)EX5            C2960S-UNIVERSALK9-M    
     3 28    WS-C2960S-24PS-L   15.0(2)EX5            C2960S-UNIVERSALK9-M

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