Peer-groups
Three common eBGP peer-groups
Advertise default-route only
Advertise customer routes
Advertise full routes
All should filter bogus inbound information
Address space that you use in your IGP!!
RFC 1918 address space
Class D and E addresses
Prefixes that are too specific (Class A /32s for example)
Un-assigned Class A, B, and C address space (optional)
“max-prefix” can be used for additional protection