3Com MSR 50 Series, Руководство по настройке

Страница: 871 / 2443

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