Bgp Path Selection Configuration - 3Com MSR 50 Series Configuration Manual

BGP Path Selection
Configuration
1 Configure IP addresses for interfaces (omitted)
2 Configure OSPF on routers B, C and D
*>i 9.1.1.0/24
[RouterD] 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
Network requirements
In the figure below, all routers run BGP. Between Router A and Router B,
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Router A and Router C are EBGP connections. Between Router B and Router D,
Router D and Router C are IBGP connections.
OSPF is the IGP protocol in AS 200.
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Configure routing policies to make Router D give priority to the route 1.0.0.0/8
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learned from Router C.
Network diagram
Figure 252 Network diagram for BGP path selection configuration
AS 100
Eth1/0
S2/0
S2/1
Router A
Device Interface
Router A Eth1/0
S2/0
S2/1
Router B S2/0
S2/1
Configuration procedure
# Configure Router B
BGP Typical Configuration Examples
10.1.3.1 0
AS 200
S2/0
S 2/1
Router B
S2/0
S2/1
Router C
IP address Device
1.0.0.0/8 Router D
192.1.1.1/24
193.1.1.1/24 Router C
192.1.1.2/24
194.1.1.2/24
100 0 100i
S2/1
S2/0
Router D
Interface IP address
S2/0 195.1.1.1/24
S2/1 194.1.1.1/24
S2/0 195.1.1.2/24
S2/1 193.1.1.2/24
871