BGP Load Balancing
Inbound
- See if the ISP supports BGP Communities with local preference to mark routes on their side
- Adjust the MED, lower is better.
- Advertise longer prefixes to both ISPs
- Use AS_Path prepending
Outbound
- Use Weight
- Use Local Preference
- Advertise a default route into the network
- Filter the provider routes and only install a subset into the RIB.
- Use AS_Path filtering
BGP multipath
- Uses the
maximum-pathskeyword.
Do not become a transit network
- Filter your routes, only advertise subnets you own.