“The primary function of a Border Gateway Protocol (BGP) speaking system is to exchange network reachability information with other BGP systems. This network reachability information includes information on the list of Autonomous Systems (ASes) that reachability information traverses. This information is sufficient for constructing a graph of AS connectivity for this reachability, from which routing loops may be pruned and, at the AS level, some policy decisions may be enforced.” –rfc4271A You can configure BGP to run in either internal (iBGP) or external (eBGP) mode.
Relevant Configuration
Enable BGP
switch(config)# protocol bgp
Configure a BGP Instance
switch(config)# router bgp 100
Apply IP address to the VLAN interface on Router 1. Run:
switch (config interface vlan 10)# ip address 10.10.10.1 /24
Apply IP address to the VLAN interface on Router 2. Run:
switch (config interface vlan 10)# ip address 10.10.10.2 /24
On BGP router 1
switch(config router bgp 100)# neighbor 10.10.10.2 remote-as 100
On BGP router 2
switch(config router bgp 100)# neighbor 10.10.10.1 remote-as 100
Show Commands to Validate Functionality
show ip bgp summary
Expected Results