Bgp Path Selection Configuration Example - HP 5500 EI series Configuration Manual

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Router B and Router D are in the same confederation, but belong to different sub-ASs. They obtain
external route information from Router A and generate identical BGP route entries although they
have no direct connection in between.

BGP path selection configuration example

Network requirements
As shown in
Router A and Router C. IBGP runs between Router B and Router D, and between Router D and Router C.
OSPF is the IGP protocol in AS 200.
Configure routing policies to make Router D give priority to the route 1.0.0.0/8 learned from Router C.
Figure 69 Network diagram
Device
Router A
Router B
Configuration procedure
1.
Configure IP addresses for interfaces. (Details not shown.)
2.
Configure OSPF on Router B, Router C, and Router D:
# Configure Router B.
<RouterB> system-view
[RouterB] ospf
[RouterB-ospf] area 0
[RouterB-ospf-1-area-0.0.0.0] network 192.1.1.0 0.0.0.255
[RouterB-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255
[RouterB-ospf-1-area-0.0.0.0] quit
[RouterB-ospf-1] quit
# Configure Router C.
<RouterC> system-view
[RouterC] ospf
[RouterC-ospf] area 0
[RouterC-ospf-1-area-0.0.0.0] network 193.1.1.0 0.0.0.255
Figure
69, all routers run BGP. EBGP runs between Router A and Router B, and between
Interface
Eth1/1
Eth1/2
Eth1/3
Eth1/1
Eth1/2
IP address
Device
1.0.0.1/8
Router D
192.1.1.1/24
193.1.1.1/24
Router C
192.1.1.2/24
194.1.1.2/24
271
Interface
IP address
Eth1/1
195.1.1.1/24
Eth1/2
194.1.1.1/24
Eth1/1
193.1.1.2/24
Eth1/2
195.1.1.2/24

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