Iamwud.co.uk Website Review

1.11 OPTIMIZE BGP IOS-XR CONFIGURATIONS USING AF-GROUPS, SESSION-GROUPS, AND NEIGHBOR-GROUPS. BGP is very “configuration heavy” when the number of neighbors increase. Often, much of the configuration is the same among several neighbors. XR uses af-groups, session-groups and neighbor-groups to share configuration among multiple neighbors and thus simplify the configuration. Each of them is used to group a particular set of configuration. Configuration that’s not specific to an address family, e.g. remote-as All three groups are configured in the main BGP mode and each have their own configuration mode: Let’s start off by looking at the session group. This template is used for configuration that (surprise surprise) is used for the BGP session itself, like the pas*word. An example of a session-group: We apply the session group to a neighbor with the ‘use’ command: neighbor 192.168.0.1 will now attempt to establish a session using the parameters defined in the session group. An af-group is for address-family specific configuration, like policy implementation. For example, let’s say that we have created a So far, these features haven’t been particularly complex. Session-groups for the BGP session and af-groups for things like The third feature, neighbor-group, is kind of combination of session group and af group in that it allows you to group commands from both of these sets. This leads us to the concept of inheritance. All of these grouping features allow you to link to other other instances of the same feature. For example, a session group can “use” another session group, and will inherit everything from it while overriding any part of the inherited config with its own configuration. The same concept applies to af groups. Neighbor groups are special in that the can inherit from both session groups and af groups at the same time, allowing you to create a complete set of configuration for a neighbor, in addition to any specific configuration that you manually add to the neighbor group.