3com S7906E Guide De Référence

 

1-12 

# In BGP view, set the default local preference to 180.  

<Sysname> system-view 

[Sysname] bgp 100 

[Sysname-bgp] default local-preference 180 

# In BGP-VPN instance view, set the default local preference to 180 (the VPN has been created). 

<Sysname> system-view 

[Sysname] bgp 100 

[Sysname-bgp] ipv4-family vpn-instance vpn1 

[Sysname-bgp-vpn1] default local-preference 180 

default med med-value 

undo default med 

BGP view/BGP-VPN instance view  

2: System level 

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

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

Use the undo default med command 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 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 other conditions are the same, the system first selects the route with the smallest MED as 

the best external route. 

# In BGP view, configure the default MED as 25.  

<Sysname> system-view 

[Sysname] bgp 100 

[Sysname-bgp] default med 25 

# In BGP-VPN instance view, configure the default MED as 25 (the VPN has been created). 

<Sysname> system-view 

[Sysname] bgp 100