Communities; Bgp Attributes; Best Path Selection Criteria - Dell C9000 Series Networking Configuration Manual

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Communities

BGP communities are sets of routes with one or more common attributes. Communities are a way to assign

common attributes to multiple routes at the same time.

Routes learned using BGP have associated properties that are used to determine the best route to a

destination when multiple paths exist to a particular destination.

These properties are referred to as BGP attributes, and an understanding of how BGP attributes influence

route selection is required for the design of robust networks. This section describes the attributes that BGP

uses in the route selection process:

Local Preference

Multi-Exit Discriminators (MEDs)

Paths for active routes are grouped in ascending order according to their neighboring external AS number

(BGP best path selection is deterministic by default, which means the bgp non-deterministic-med

command is NOT applied).

The best path in each group is selected based on specific criteria. Only one "best path" is selected at a time. If

any of the criteria results in more than one path, BGP moves on to the next option in the list. For example,

two paths may have the same weights, but different local preferences. BGP sees that the Weight criteria

results in two potential "best paths" and moves to local preference to reduce the options. If a number of best

paths is determined, this selection criteria is applied to group's best to determine the ultimate best path.

In non-deterministic mode (the bgp non-deterministic-med command is applied), paths are compared

in the order in which they arrive. This method can lead to the system choosing different best paths from a set

of paths, depending on the order in which they were received from the neighbors because MED may or may

not get compared between the adjacent paths. In deterministic mode, the system compares MED between

the adjacent paths within an AS group because all paths in the AS group are from the same AS.

Border Gateway Protocol IPv4 (BGPv4)