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Introduction This document contains frequently asked questions (FAQs) about Border Gateway Protocol (BGP). Q. How do I configure BGP? A. Refer to these documents for information on how to configure BGP and BGP functioning: Configuring BGP BGP Case Studies Q. How do I configure BGP with the use of a loopback address? A. The use of a loopback interface ensures that the neighbor stays up and is not affected by malfunctioning hardware. BGP uses the IP address configured on the physical interface directly connected to the BGP peer as the source address when it establishes the BGP peering session, by default. Issue the neighbor <ip address> update-source <interface> command in order to change this behavior and configure the BGP that speaks to the router to establish peering with the use of a loopback address as the source address. Refer to Sample Configuration for iBGP and eBGP With

Lists the administrative distance default values of the protocols that Cisco device supports below; Routing protocol / Route source Default Distance Values Connected interface 0 Static route 1 Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5 External Border Gateway Protocol (eBGP) 20 Internal EIGRP 90 IGRP 100 OSPF 110 Intermediate System-to-Intermediate System (IS-IS) 115 Routing Information Protocol (RIP) 120 Exterior Gateway Protocol (EGP) 140 On Demand Routing (ODR) 160