R2511-HP MSR Router Series IP Multicast Command Reference(V5)

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Usage guidelines
Using this command can affect IPv6 MBGP route selection.
Examples
# In IPv6 MBGP address family view, set the default local preference to 180.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv6-family multicast
[Sysname-bgp-af-ipv6-mul] default local-preference 180
default med (IPv6 MBGP address family view)
Use default med to specify the 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
IPv6 MBGP address family view
Default command level
2: System level
Parameters
med-value: Specifies a default MED value in the range of 0 to 4294967295.
Usage guidelines
The multi-exit discriminator (MED) is an external metric of a route. Different from the local preference, the
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 the other conditions are the same, the system selects the route with the lowest MED as the best
external route.
Examples
# Devices A and B belong to AS 100 and device C belongs to AS 200. C is the peer of A and B.
Configure the MED of A as 25 to make C select the path from B.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv6-family multicast
[Sysname-bgp-af-ipv6-mul] default med 25
default-route imported (IPv6 MBGP address family view)
Use default-route imported to enable default route redistribution into the IPv6 MBGP routing table.