BGP Attributes

The following BGP attributes are supported by the switch:

• Origin—Defines the origin of the route. Possible values are Interior Gateway Protocol (IGP), Exterior Gateway Protocol (EGP), and incomplete.
• AS_Path—The list of ASs that are traversed for this route. The local AS-path is added to the BGP update packet after the policy is applied.
• AS4_Path—This attribute is used by 4-byte peers when sending updates to 2-byte peers. This attribute carries AS-number information that can be represented only in 4-bytes.
• Next_hop—The IP address of the next hop BGP router to reach the destination listed in the NLRI field.
• Multi_Exit_Discriminator—Used to select a particular border router in another AS when multiple border routers exist.
• Local_Preference—Used to advertise this router‘s degree of preference to other routers within the AS.
• Atomic_aggregate—Indicates that the sending border router has used a route aggregate prefix in the route update.
• Aggregator—Identifies the BGP router AS number and router ID for the router that performed route aggregation.
• AS4_Aggregator: This attribute is used by 4-byte peers when sending updates to 2-byte peers. This attribute carries AS-number information that can be represented only in 4-bytes.
• Community—Identifies a group of destinations that share one or more common attributes.
• Cluster_ID—Specifies a 4-byte field used by a route reflector to recognize updates from other route reflectors in the same cluster.
• Originator_ID—Specifies the router ID of the originator of the route in the local AS.
• Extended Community—Provides a mechanism for labeling BGP-4 update messages that carry information
• Multiprotocol reachable NLRI—Used to advertise a feasible BGP route for the non IPv4-unicast address family
• Multiprotocol unreachable NLRI—This attribute is used to withdraw multiple unfeasible routes from service