HP 5500 EI series Configuration Manual page 225

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Step
4.
Enable MED comparison for
routes from different ASs.
To enable MED comparison for routes from different ASs (IPv6):
Step
1.
Enter system view.
2.
Enter BGP view.
3.
Enter BGP IPv6 unicast
address family view.
4.
Enable MED comparison for
routes from different ASs.
Enabling MED comparison for routes on a per-AS basis
This task enables BGP to compare the MEDs of routes from an AS.
Figure 56 Route selection based on MED (in an IPv4 network)
AS 200
Router ID : 3.3.3.3
Router A
As shown in
Router B has a smaller router ID, the route learned from Router B is optimal.
Network
*>i
10.0.0.0
* i
When Router D learns network 10.0.0.0 from Router C, it compares the route with the optimal route in
its routing table. Because Router C and Router B reside in different ASs, BGP does not compare the MEDs
of the two routes. Router C has a smaller router ID than Router B so the route from Router C becomes
optimal.
Network
*>i
10.0.0.0
* i
10.0.0.0
AS 400
Router ID : 1.1.1.1
Router C
Eth1/1
Eth1/1
3.3.3.3/24
1.1.1.1
AS 100
Figure
56, Router D learns network 10.0.0.0 from both Router A and Router B. Because
NextHop
2.2.2.2
3.3.3.3
NextHop
1.1.1.1
2.2.2.2
Command
compare-different-as-med
Command
system-view
bgp as-number
address-family ipv6 [ unicast ]
compare-different-as-med
Router E
10.0.0.0
Router B
Router D
MED
50
50
MED
60
50
214
Remarks
By default, this feature is disabled.
Remarks
N/A
N/A
N/A
By default, this feature is disabled.
AS 300
Router ID : 2.2.2.2
Eth1/1
2.2.2.2/24
LocPrf
PrefVal Path/Ogn
0
0
LocPrf
PrefVal Path/Ogn
0
0
300e
200e
200e
300e

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