279
AS-path : 100
Origin : igp
Attribute value : MED 0, localpref 100, pref-val 0, pre 255
State : valid, internal-confed, best,
The output shows 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
As shown 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
Table 16 Interface and IP address assignment
Device Interface IP address Device Interface IP address
Switch A Vlan-int101 1.0.0.1/8 Switch D Vlan-int400 195.1.1.1/24
Vlan-int100 192.1.1.1/24 Vlan-int300 194.1.1.1/24
Vlan-int200 193.1.1.1/24 Switch C Vlan-int400 195.1.1.2/24
Switch B Vlan-int100 192.1.1.2/24 Vlan-int200 193.1.1.2/24
Vlan-int300 194.1.1.2/24
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
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