Multi_Exit_Disc Attribute Related Configuration - D-Link xStack DGS-3610 Series Configuration Manual

Chapter 29 BGP Configuration
Caution
29.9.3 MULTI_EXIT_DISC Attribute
Related Configuration
The BGP takes the MED value as the foundation to compare with the priority of the path
learned from the EBGP Peers. The smaller the MED value, the higher the priority of the path
is.
By default, it will only compare with the MED value for the path of the peers from the same
AS when the optimal path is selected. If you hope to compare with the MED value for the
path of the peers from different AS's, execute the following operations in the BGP
configuration mode:
Command
Router(config-router)# bgp
always-compare-med
By default, it will not compare with the MED value for the path of the peers for other AS's
within the AS association when the optimal path is selected. If you hope to compare with the
MED value for the path of the peers from different AS confederations, execute the following
operations in the BGP :configuration mode
Command
Router(config-router)# bgp bestpath
med confed
By default, if the path whose MED attribute is not set is received, The MED value of this path
will be taken as 0. For the smaller the MED value, the higher the priority of the path is, the
MED value of this path reaches the highest priority. If you hope the MED attribute for the
path whose MED attribute is not set presents the lowest priority, execute the following
operations in the BGP configuration mode:
Command
Router(config-router)# bgp bestpath
med missing-as-worst
By default, they will be compared with each other according to the sequence the paths are
received when the optimal path is selected. If you hope to compare with the path of the peers
from the same AS firstly, execute the following operations in the BGP configuration mode:
29-14
This command is not recommended to use under the full mesh network
environment (such as Ethernet), for this command will cause the extra
hops of the message and increase unnecessary overhead.
DGS-3610 Series Configuration Guide
Meaning
(Optional) Allow to compare with the MED value for the
path of different AS's.
Meaning
(Optional) Allow to compare with the MED value for the
path of the peers from other ASs within the
confederation.
Meaning
(Optional) Set the priority of the path whose MED
attribute is not set as the lowest.