vyos(config-route-map)# set extcommunity bandwidth 
  (1-25600)       Bandwidth value in Mbps
  cumulative      Cumulative bandwidth of all multipaths (outbound-only)
  num-multipaths  Internally computed bandwidth based on number of multipaths (outbound-only)
vyos(config-route-map)# set extcommunity bandwidth 2500 
  <cr>            
  non-transitive  Attribute is set as non-transitive

vyos(config-router)# bgp bestpath bandwidth 
  default-weight-for-missing  Assign a low default weight (value 1) to paths not having link bandwidth
  ignore                      Ignore link bandwidth (i.e.,  do regular ECMP,  not weighted)
  skip-missing                Ignore paths without link bandwidth for ECMP (if other paths have it)