Cisco Certified Network Professional (CCNP) Question:
Describe four differences between the operation of IBGP and EBGP.
Answer:
► IBGP is the protocol used between routers in the same autonomous system. EBGP is the protocol used between routers in different autonomous systems.
► IBGP routes must be synchronized before they can be transferred to the IP routing table (unless synchronization is disabled).
► 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 IBGP router advertises a prefix to an IBGP peer if the prefix was learned from an EBGP neighbor.
► 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.
► IBGP routes must be synchronized before they can be transferred to the IP routing table (unless synchronization is disabled).
► 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 IBGP router advertises a prefix to an IBGP peer if the prefix was learned from an EBGP neighbor.
► 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.
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