R3303-HP 6600/HSR6600 Routers Layer 3 - IP Routing Configuration Guide

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BGP path selection configuration
Network requirements
• In Figure 80, all routers run BGP. EBGP runs between Router A and Router B, and between 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 80 Network diagram
Device Interface IP address Device Interface IP address
Router A GE2/1/1 1.0.0.0/8 Router D S2/2/0 195.1.1.1/24
S2/2/0 192.1.1.1/24 S2/2/1 194.1.1.1/24
S2/2/1 193.1.1.1/24 Router C S2/2/0 195.1.1.2/24
Router B S2/2/0 192.1.1.2/24 S2/2/1 193.1.1.2/24
S2/2/1 194.1.1.2/24
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure OSPF on routers B, C, and 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
[RouterC-ospf-1-area-0.0.0.0] network 195.1.1.0 0.0.0.255
[RouterC-ospf-1-area-0.0.0.0] quit
Router A
AS 100
GE2/1/1
S2/2/0
Router C
AS 200
S2/2/1
S2/2/0
S2/2/0
S2/2/1
S2/2/1
Router B
Router D
S2/2/0
S2/2/1