Bgp Path Selection Configuration Example - HP 6125XLG Layer 3 - Ip Routing Configuration Manual

State
The output indicates the following:
Switch F can send route information to Switch B and Switch C through the confederation by
•
establishing only an EBGP connection with Switch A.
• Switch B and Switch D are in the same confederation, but belong to different sub-ASs. They obtain
external route information from Switch A and generate identical BGP route entries although they
have no direct connection in between.

BGP path selection configuration example

Network requirements
In Figure 70, all switches run BGP. EBGP runs between Switch A and Switch B, and between Switch A
and Switch C. IBGP runs between Switch B and Switch D, and between Switch D and Switch C. OSPF is
the IGP protocol in AS 200.
Configure routing policies, making Switch D use the route 1.0.0.0/8 from Switch C as the optimal.
Figure 70 Network diagram
Device
Switch A
Switch B
Configuration procedure
1. Configure IP addresses for interfaces. (Details not shown.)
2. Configure OSPF on Switch B, Switch C, and Switch D:
# Configure Switch B.
<SwitchB> system-view
[SwitchB] ospf
[SwitchB-ospf] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 192.1.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] network 194.1.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit
: valid, internal-confed, best,
Interface IP address
Vlan-int101 1.0.0.1/8
Vlan-int100 192.1.1.1/24
Vlan-int200 193.1.1.1/24
Vlan-int100 192.1.1.2/24
Vlan-int300 194.1.1.2/24
Device
Switch D
Switch C
280
Interface IP address
Vlan-int400 195.1.1.1/24
Vlan-int300 194.1.1.1/24
Vlan-int400 195.1.1.2/24
Vlan-int200 193.1.1.2/24