F3215-HP Load Balancing Module Network Management Command Reference-6PW101

252
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] default local-preference 180
default med (BGP view)
Use default med to specify a default MED value.
Use undo default med to restore the default.
Syntax
default med med-value
undo default med
Default
The default med-value is 0.
Views
BGP view
Default command level
2: System level
Parameters
med-value: Specifies the default MED value, in the range of 0 to 4294967295.
Usage guidelines
Multi-exit discriminator (MED) is an external metric for routes. Different from local preference, MED is
exchanged between ASs and stays 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 selects 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
default-route imported (BGP view)
Use default-route imported to allow default route redistribution into the BGP routing table.
Use undo default-route imported to disallow the redistribution.
Syntax
default-route imported
undo default-route imported
Default
Default route redistribution is not allowed.