Concept Guide

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Changing MED Attributes
By default, Dell EMC Networking OS uses the MULTI_EXIT_DISC or MED attribute when comparing EBGP paths received from dierent
BGP neighbors or peers from the same AS for the same route. You can congure the device to compare the MED attributes from
neighbors or peers in dierent AS using the bgp always-compare-med command.
To change the usage of MED attribute to choose the best path among the advertised, enter any or all of the following commands.
• Enable MED comparison in the paths from neighbors with dierent ASs.
CONFIG-ROUTER-BGP mode
bgp always-compare-med
By default, this comparison is not performed.
• Change the bestpath MED selection.
CONFIG-ROUTER-BGP mode
bgp bestpath med {confed | missing-as-best}
– confed: Chooses the bestpath MED comparison of paths learned from BGP confederations.
– missing-as-best: Treats a path without a MED value as the most preferred one.
To view the non-default values, use the show config command in CONFIGURATION ROUTER BGP mode.
Changing the LOCAL_PREFERENCE Attribute
In Dell EMC Networking OS, you can change the value of the LOCAL_PREFERENCE attribute, so that the preferred path can be changed.
To change the default values of this attribute for all routes received by the router, use the following command.
• Change the LOCAL_PREF value.
CONFIG-ROUTER-BGP mode
bgp default local-preference value
value: the range is from 0 to 4294967295. The default is 100.
Example conguration of changing the LOCAL_PREFERENCE attribute
DellEMC# configure terminal
DellEMC(conf)# router bgp 400
224
Border Gateway Protocol (BGP)