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Using this command can affect MBGP route selection.
Examples
# In IPv4 MBGP address family view, set the default local preference to 180.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family multicast
[Sysname-bgp-af-mul] default local-preference 180
default med (MBGP address family view)
Syntax
default med med-value
undo default med
View
IPv4 MBGP address family view
Default level
2: System level
Parameters
med-value: Specifies the default MED value, in the range of 0 to 4294967295.
Description
Use default med to specify the default MED value.
Use undo default med 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 stays in the AS after it enters the AS. The route with a lower MED is
preferred. When a router that is 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. If
all other conditions are the same, the system selects the route with the smallest MED as the best external
route.
Examples
# In IPv4 MBGP address family view, configure the default MED as 25.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family multicast
[Sysname-bgp-af-mul] default med 25
default-route imported (MBGP address family view)
Syntax
default-route imported
undo default-route imported
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