HP FlexFabric 12900E Series Configuration Manual page 259

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To enable MED comparison for routes on a per-AS basis:
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Enable MED comparison for
routes on a per-AS basis.
Enabling MED comparison for routes from confederation peers
This task 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,
and the MED values of them are 2, 3, and 1. Because the third route's AS_PATH attribute contains
AS number 65008 that does not belong to the confederation, BGP does not compare it with other
routes. As a result, the first route becomes the optimal route.
To enable MED comparison for routes from confederation peers:
Step
1. Enter system view.
2. Enter BGP instance view or
BGP-VPN instance view.
3. Enable MED comparison for
routes from confederation
peers.
1.1.1.1 60
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name
[ multi-session-thread ]
•
Enter BGP-VPN
view:
a. bgp
[
instance-name
[ multi-session-thread ]
b. ip
vpn-instance-name
bestroute compare-med
Command
system-view
•
Enter BGP instance view:
bgp as-number [ instance
instance-name
[ multi-session-thread ]
•
Enter BGP-VPN
view:
a. bgp
[
instance-name
[ multi-session-thread ]
b. ip
vpn-instance-name
bestroute med-confederation
247
0
Remarks
N/A
]
instance
N/A
as-number
instance
]
vpn-instance
By default, MED comparison for
routes on a per-AS basis is
disabled.
Remarks
N/A
]
instance
N/A
as-number
instance
]
vpn-instance
By default, MED comparison for
routes from confederation peers is
disabled.
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