BGP Peer-Session Templates

Another way to make the BGP configuration easier by avoiding configuring the same command set on every router. It makes your life easier if you have various neighbors to which you'd like to apply a common set of attributes.

Step 1: Define the peer-session and give it a name:
(config-router)#template peer-session MYBGP

Step 2: Assign the attributes to the peer-session:
(config-router-stmp)#version 4
(config-router-stmp)#update-source lo0
(config-router-stmp)#password Cisqueros

Step 3: If you have more groups of neighbors, and they all have some commmon settings (for example the ones defined
in the template IBGP), and some different ones. Then create another template, and inherit the first template:
(config-router)#template peer-session GROUP_1 <- FOR AS 100
(config-router-stmp)#inherit peer-session MYBGP
(config-router-stmp)#remote-as 100

(config-router)#template peer-session GROUP_2 <- FOR AS 200
(config-router-stmp)#inherit peer-session MYBGP
(config-router-stmp)#remote-as 200

Step 4: Apply the LAST defined Template to RELEVANT NEIGHBORS, that inherited the settings of the initial Templates:
(config-router)#neighbor 1.1.1.1 inherit peer-session GROUP_1
(config-router)#neighbor 2.2.2.2 inherit peer-session GROUP_1
(config-router)#neighbor 3.3.3.3 inherit peer-session GROUP_2