Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up.
Sign up to join this community
"Route-target export" is used to export routes form VRF to mBGP - i need to know the rules which tells which routes will be exported.
For example : if VRF-RED have 10 Routes which include static routes, connected routes, OSPF routes and routes it imported from VRF-YELLOW. Now if VRF-RED export and VRF-GREEN import, then which of the 10 VRF-RED's route VRF-GREEN will get?
It's depends on RT value. If you are using same RT value for VRF-YELLOW , VRF-RED and VRF-GREEN then you will get all the routes in VRF-GREEN. Otherwise, if you are using different RT value for VRF-YELLOW & VRF-RED and different for VRF-RED & VRF-GREEN, you will get all routes except the routes received from VRF-YELLOW.
Don't forget that VPN's depend on the RT's for the import/export policies. RT's are carried with the prefix along the VPNV4 space to identify the origin of the prefix.
