HP 5500 EI series User Manual

214
Step Command Remarks
4. Enable MED comparison for
routes from different ASs.
compare-different-as-med By default, this feature is disabled.
To enable MED comparison for routes from different ASs (IPv6):
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A
3. Enter BGP IPv6 unicast
address family view.
address-family ipv6 [ unicast ] N/A
4. Enable MED comparison for
routes from different ASs.
compare-different-as-med
By default, this feature is disabled.
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 shown in Figure 56, Router D learns network 10.0.0.0 from both Router A and Router B. Because
Router B has a smaller router ID, the route learned from Router B is optimal.
Network NextHop MED LocPrf PrefVal Path/Ogn
*>i 10.0.0.0 2.2.2.2 50 0 300e
* i 3.3.3.3 50 0 200e
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 NextHop MED LocPrf PrefVal Path/Ogn
*>i 10.0.0.0 1.1.1.1 60 0 200e
* i 10.0.0.0 2.2.2.2 50 0 300e
AS 300
AS 100
AS 200
Router A
Router D
Router ID : 3.3.3.3
Router ID : 1.1.1.1
Router C
Eth1/1
1.1.1.1
Eth1/1
3.3.3.3/24
Router B
Router ID : 2.2.2.2
Eth1/1
2.2.2.2/24
AS 400
Router E
10.0.0.0

HP 5500 EI series Specifications

General

Brand	HP
Model	5500 EI series
Category	Switch
Language	English