3com S7906E Guide De Référence

 

1-6 

2: System level 

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 value. 

By default, the default local preference is 100. 

Use this command to affect IPv6 BGP route selection. 

# Two devices A and B in the same AS are connected to another AS. Change the local preference of B 

from default value 100 to 180, making the route passing B preferred. 

<Sysname> system-view 

[Sysname] bgp 100 

[Sysname-bgp] ipv6-family 

[Sysname-bgp-af-ipv6] default local-preference 180 

default med med-value 

undo default med 

IPv6 address family view 

2: System level 

med-value: 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 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 the identical destination and different 

next-hops from various external peers, it will select the best route depending on the MED value. In the