identifier type 0 <identifier_value> virtual vfi

[Dhikra Marghli]

Inter-area EVPN & VPLS Interconnection configuration on AGGregation-PE

virtual vfi <evi-id>===============>  also  i want expert explain me this command 
  ethernet-segment
   identifier type 0 <identifier_value>===========>  this command is not clear and how i can give identifier_value ?? 

I wait a reply from expert IOS XR service provider 

Thanks

[Dhikra Marghli]

Hello

some one can help me 

Thanks