3com S7906E Guide De Référence

 

1-6 

value: Default local preference, in the range 0 to 4294967295. The larger the value is, the higher the 

preference is. 

Use the default local-preference command to configure the default local preference.  

Use the undo default local-preference command to restore the default. 

By default, the default local preference is 100. 

Using this command can affect IPv6 MBGP route selection. 

# 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 med-value 

undo default med 

IPv6 MBGP address family view 

2: System level 

med-value: Default MED value, in the range 0 to 4294967295. 

Use the default med command to specify the default MED value.  

Use the undo default med command to restore the default. 

By default, the default med-value is 0. 

The multi-exit discriminator (MED) is an external metric of a route. Different from the local preference, 

the 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 the other conditions are the same, the system selects the route with the lowest MED 

as the best external route.