BGP Attributes
Attribute Meaning
AS path An ordered list of all the autonomous systems
through which this update has passed. Wellknown,
mandatory.
Origin How BGP learned of this network. i = by network
command, e = from EGP, ? = redistributed from
other source. Well-known, mandatory.
Next hop The IP address of the next-hop router.
Well-known, mandatory.
Local preference A value telling IBGP peers which path to select
for traffic leaving the AS. Well-known,
discretionary.
Multi-Exit Discriminator Suggests to a neighboring autonomous system
(MED) which of multiple paths to select for traffic bound
into your autonomous system. Optional, nontransitive.
Weight Cisco proprietary, to tell a router which of multiple
local paths to select for traffic leaving the AS.
Only has local significance.