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With the bestroute compare-med command configured, the router puts routes received from the same AS
into a group. The router then selects the route with the lowest MED from the same group, and compares
routes from different groups. This mechanism avoids the above-mentioned problem.
If the bestroute compare-med and balance commands are configured at the same time, the balance
command does not take effect.
Examples
# In BGP IPv4 unicast instance view, enable MED comparison for routes on a per-AS basis.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv4-family unicast
[Sysname-bgp-ipv4] bestroute compare-med
# In BGP-VPN IPv4 unicast instance view, enable MED comparison for routes on a per-AS basis.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ip vpn-instance vpn1
[Sysname-bgp-vpn1] ipv4-family unicast
[Sysname-bgp-ipv4-vpn1] bestroute compare-med
# In BGP IPv6 unicast instance view, enable MED comparison for routes on a per-AS basis.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv6-family unicast
[Sysname-bgp-ipv6] bestroute compare-med
bestroute med-confederation
Use bestroute med-confederation to enable MED comparison for routes received from confederation
peers.
Use undo bestroute med-confederation to restore the default.
Syntax
bestroute med-confederation
undo bestroute med-confederation
Default
MED comparison is disabled for routes received from confederation peers.
Views
BGP IPv4 unicast instance view, BGP-VPN IPv4 unicast instance view, BGP IPv6 unicast instance view
Predefined user roles
network-admin
Usage guidelines
This command enables BGP to compare the MEDs of routes received from confederation peers. However,
if a route received from a confederation peer has an AS number that does not belong to the
confederation, BGP does not compare the route with other routes. For example, a confederation has
three AS numbers 65006, 65007, and 65009. BGP receives three routes from different confederation
peers. The AS_PATH attributes of these routes are 65006 65009, 65007 65009, and 65008 65009,
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