Set BGP Local Pref through two providers, balancing — RouterOS (Mikrotik)

If you want most of your traffic to go through one provider. Then in default
you need to set different Set BGP Local Pref

RouterOS (Mikrotik)

/routing filter

add action=accept address-family=ip chain=FROM-ONE-PROVIDER.RU comment="Accept DEFAULT" prefix=0.0.0.0/0 prefix-length=0 protocol=bgp set-bgp-local-pref=10

add action=accept address-family=ip chain=FROM-TWO-PROVIDER.RU comment="Accept DEFAULT" prefix=0.0.0.0/0 prefix-length=0 protocol=bgp set-bgp-local-pref=20

ONE-PROVIDER — set-bgp-local-pref=10

TWO-PROVIDER.RU — set-bgp-local-pref=20

Print ONE-PROVIDER

[g@router.galaxydata.ru] > interface monitor-traffic vlan-5-one-bgp
                         name:  vlan-1080-dataekb-bgp
        rx-packets-per-second:                  2 232
           rx-bits-per-second:                5.4Mbps
     fp-rx-packets-per-second:                      0
        fp-rx-bits-per-second:                   0bps
          rx-drops-per-second:                      0
         rx-errors-per-second:                      0
        tx-packets-per-second:                      0
           tx-bits-per-second:                   0bps
     fp-tx-packets-per-second:                      0
        fp-tx-bits-per-second:                   0bps
          tx-drops-per-second:                      0
    tx-queue-drops-per-second:                      0
         tx-errors-per-second:                      0

Print TWO-PROVIDER

[g@router.galaxydata.ru] > interface monitor-traffic vlan-6-two-bgp 
                         name:  vlan-3904-domru-bgp
        rx-packets-per-second:               37 203
           rx-bits-per-second:            102.3Mbps
     fp-rx-packets-per-second:                    0
        fp-rx-bits-per-second:                 0bps
          rx-drops-per-second:                    0
         rx-errors-per-second:                    0
        tx-packets-per-second:               41 619
           tx-bits-per-second:            164.3Mbps
     fp-tx-packets-per-second:                    0
        fp-tx-bits-per-second:                 0bps
          tx-drops-per-second:                    0
    tx-queue-drops-per-second:                    0
         tx-errors-per-second:                    0

Router Filter Print

[g@r.galaxydata.ru] > /routing filter print where chain=FROM-ONE-PROVIDER
Flags: X - disabled
0 ;;; Accept DEFAULT
chain=FROM-ONE-PROVIDER prefix=0.0.0.0/0 prefix-length=0 protocol=bgp address-family=ip invert-match=no action=accept set-bgp-local-pref=10 set-bgp-prepend-path=""

Router Filter Print

[g@r.galaxydata.ru] > /routing filter print where chain=FROM-TWO-PROVIDER
Flags: X - disabled
0 ;;; Accept DEFAULT
chain=FROM-TWO-PROVIDER prefix=0.0.0.0/0 prefix-length=0 protocol=bgp address-family=ip invert-match=no action=accept set-bgp-local-pref=20 set-bgp-prepend-path=""