If a router has more than one route to the same IP prefix, the best path is the one with the highest LOCAL_PREF (assuming the WEIGHT attribute for the routes is equal).

WEIGHT has only local significance and is not advertised to BGP peers.

If a router has more than one route to the same IP prefix, the best path is the one with the highest WEIGHT value.

If a router has more than one route to the same IP prefix, the best path is the one with the shortest AS _PATH (assuming other BGP attributes are equal).

1. IBGP is the protocol used between routers in the same autonomous system. EBGP is the protocol used between routers in different autonomous systems.
2. IBGP routes must be synchronized before they can be transferred to the IP routing table (unless synchronization is disabled).
3. EBGP sets the next hop attribute to the IP address of the interface used to communicate with the EBGP peer. The next hop attribute is not modified when an IBGProuter advertises a prefix to an IBGP peer if the prefix was learned from an EBGP neighbor.
4. EBGP advertises all prefixes learned from an EBGP neighbor to all other EBGP neighbors. IBGP routers do not advertise prefixes learned from one IBGP neighbor to another IBGP neighbor.