Default route in BGP

RouterOS Forwarding Protocols
1

I’m testing BGP between Mikrotik and Cisco, Cisco is advertising the default route to Mikrotik, but the route is not injected into MT routing table:

[admin@MikroTik] ip route> print
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf

DST-ADDRESS PREFSRC G GATEWAY DISTANCE INTERFACE

0 ADC 172.16.16.0/24 172.16.16.2 ether3
1 ADC 172.16.19.0/30 172.16.19.2 ether2
2 A S 172.16.21.1/32 r 172.16.19.1 ether2
3 ADC 172.16.21.2/32 172.16.21.2 Loopback
[admin@MikroTik] ip route> print detail
Flags: X - disabled, A - active, D - dynamic, C - connect, S - static, r - rip, b - bgp, o - ospf
0 ADC dst-address=172.16.16.0/24 prefsrc=172.16.16.2 interface=ether3 scope=10 target-scope=0

1 ADC dst-address=172.16.19.0/30 prefsrc=172.16.19.2 interface=ether2 scope=10 target-scope=0

2 A S dst-address=172.16.21.1/32 gateway=172.16.19.1 interface=ether2 gateway-state=reachable scope=255 target-scope=10

3 ADC dst-address=172.16.21.2/32 prefsrc=172.16.21.2 interface=Loopback scope=10 target-scope=0

[admin@MikroTik] > routing bgp peer print status

REMOTE-ADDRESS REMOTE-AS STATE ROUTES-RECEIVED

0 172.16.21.1 64513 connected 1

anyone can help?

2

BGP peer state other than ‘established’ means that for some reason peers are unable to establish connection completely. Enable BGP logs on mikrotik and look for any error messages
/system logging add topics=bgp,!raw action=memory

Also enable debug logs on cisco.