248
BGP routing table information of 9.1.1.0/24:
From : 10.1.3.1 (1.1.1.1)
Relay nexthop : 10.1.3.1
Original nexthop: 10.1.3.1
OutLabel : NULL
AS-path : 100
Origin : igp
Attribute value : MED 0, localpref 100, pref-val 0, pre 255
State : valid, internal-confed, best,
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 the same BGP route entries as if they were
in one AS, although they have no direct connection in between.
BGP path selection configuration example
Network requirements
In Figure 64, 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 64 Network diagram
Device Interface IP address
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