Default Med - H3C S7500E Series Command Manual

Command Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches

5.1.14 default med

Syntax
default med med-value
undo default med
View
BGP view
Parameters
med-value: Default MED value, in the range 0 to 4294967295.
Description
Use the default med command to specify a default MED value.
Use the undo default med command to restore the default.
By default, the default med-value is 0.
Multi-exit discriminator (MED) is an external metric for routes. Different from local
preference, MED is exchanged between ASs and will stay in the AS once it enters the
AS. The route with a lower MED is preferred. When a router running BGP obtains
several routes with an identical destination but different next-hops from various external
peers, it will select the best route depending on the MED value. In the case that all other
conditions are the same, the system first selects the route with the smallest MED as the
best external route.
Examples
# In BGP view, configure the default MED as 25.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] default med 25
5.1.15 default-route imported
Syntax
default-route imported
undo default-route imported
View
BGP view
Chapter 5 BGP Configuration Commands
5-12