243
Not advertised to any peers yet
# Display the BGP routing table on Switch D.
[SwitchD] display bgp routing-table
Total Number of Routes: 1
BGP Local router ID is 4.4.4.4
Status codes: * - valid, ^ - VPNv4 best, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Network NextHop MED LocPrf PrefVal Path/Ogn
*>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
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 the same BGP route entries; it
seems like they reside in the same AS although they have no direct connection in between.
BGP path selection configuration example
Network requirements
In Figure 95, 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.
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