BGP Attributes
The following
BGP (Border Gateway Protocol) 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
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