410 CHAPTER 30: BGP CONFIGURATION
*>i 9.1.1.0/24 10.1.3.1 0 100 0 100i
[SwitchD] display bgp routing-table 9.1.1.0
BGP local router ID : 4.4.4.4
Local AS number : 65001
Paths: 1 available, 1 best
BGP routing table entry information of 9.1.1.0/24:
From : 10.1.3.1 (1.1.1.1)
Relay Nexthop : 0.0.0.0
Original nexthop: 10.1.3.1
AS-path : 100
Origin : igp
Attribute value : MED 0, localpref 100, pref-val 0, pre 255
State : valid, internal, best,
Not advertised to any peers yet
BGP Path Selection
Configuration
Network requirements
■ In the figure below, all switches run BGP. Between Switch A and Switch B, and
between Switch A and Switch C are EBGP connections. Between Switch B and
Switch D, and between Switch D and Switch C are IBGP connections.
■ 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.
Network diagram
Figure 136 Network diagram for BGP path selection configuration
Configuration procedure
1 Configure IP addresses for interfaces (omitted).
2 Configure OSPF on Switch B, C, and D.
# Configure Switch B.
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
Switch A
AS 100
Vlan-int101
Switch C
AS 200
Vlan-int200
Switch B
Switch D
Vlan-int100
Vlan-int200
Vlan-int400
Vlan-int400
Vlan-int300
Vlan-int300Vlan-int100
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