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NetStructure™ 480T Routing Switch User Guide
You can use BGP as an exterior border gateway protocol (EBGP),
or you can use it within an AS, as an interior border gateway
protocol (IBGP).
BGP Attributes
These well-known BGP attributes are supported by the 480T
routing switch:
• Origin – Defines the origin of the route. Possible values are IGP,
EGP, and incomplete.
• AS_Path – The list of ASs that are traversed for this route.
• Next_hop – The IP address of the next-hop BGP router to reach
the destination listed in the Network Layer Reachability
Information (NLRI) field.
• Multi_Exit_Discriminator (MED) – 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 is
using a route-aggregate prefix in the route update.
• Aggregator – Identifies the BGP router AS number and IP address
that performed route aggregation.
• 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.
BGP Communities
A BGP community is a group of Border Gateway Protocol
destinations that require common handling. The 480T routing
switch supports these well-known BGP community attributes:
• no-export
• no-advertise
• internet