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Example for Configuring BGP to Interact with an IGP
Networking Requirements
The network shown in Figure 9-29 is divided into AS 65008 and AS 65009. In AS 65009, an IGP is used to calculate routes. In this example, OSPF is used as an IGP. The two ASs need to communicate with each other.
Configuration Roadmap
The configuration roadmap is as follows:
- Configure OSPF on Routers B and C so that these devices can access each other.
- Establish an EBGP connection between Routers A and B so that these devices can exchange routing information.
- Configure BGP and OSPF to import routes from each other on Router B so that the two ASs can communicate with each other.
- (Optional) Configure BGP route summarization on Router B to simplify the BGP routing table.
Procedure
- Configure an IP address for each interface.
Configure an IP address to each interface as shown in Figure 9-29. For details about the configuration, see the following configuration files.
- Configuring OSPF
# Configure Router B.
<Huawei> system-view[Huawei] sysname RouterB[RouterB] ospf 1[RouterB-ospf-1] area 0[RouterB-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255[RouterB-ospf-1-area-0.0.0.0] quit[RouterB-ospf-1] quit# Configure Router C.
[RouterC] ospf 1[RouterC-ospf-1] area 0[RouterC-ospf-1-area-0.0.0.0] network 9.1.1.0 0.0.0.255[RouterC-ospf-1-area-0.0.0.0] network 9.1.2.0 0.0.0.255[RouterC-ospf-1-area-0.0.0.0] quit[RouterC-ospf-1] quit - Establish an EBGP connection.
# Configure Router A.
[RouterA] bgp 65008[RouterA-bgp] router-id 1.1.1.1[RouterA-bgp] peer 3.1.1.1 as-number 65009[RouterA-bgp] ipv4-family unicast[RouterA-bgp-af-ipv4] network 8.1.1.0 255.255.255.0# Configure Router B.
[RouterB] bgp 65009[RouterB-bgp] router-id 2.2.2.2[RouterB-bgp] peer 3.1.1.2 as-number 65008 - Configure BGP to interact with an IGP
# On Router B, configure BGP to import OSPF routes.
[RouterB-bgp] ipv4-family unicast[RouterB-bgp-af-ipv4] import-route ospf 1[RouterB-bgp-af-ipv4] quit[RouterB-bgp] quit# View the routing table of Router A.
[RouterA] display bgp routing-tableBGP Local router ID is 1.1.1.1
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 3
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 8.1.1.0/24 0.0.0.0 0 0 i
*> 9.1.1.0/24 3.1.1.1 0 0 65009?
*> 9.1.2.0/24 3.1.1.1 2 0 65009?
# On Router B, configure OSPF to import BGP routes.
[RouterB] ospf[RouterB-ospf-1] import-route bgp[RouterB-ospf-1] quit# View the routing table of Router C.
[RouterC] display ip routing-tableRoute Flags: R - relay, D - download to fib ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 7 Routes : 7 Destination/Mask Proto Pre Cost Flags NextHop Interface 8.1.1.0/24 O_ASE 150 1 D 9.1.1.1 GigabitEthernet1/0/0 9.1.1.0/24 Direct 0 0 D 9.1.1.2 GigabitEthernet1/0/0 9.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet1/0/0 9.1.2.0/24 Direct 0 0 D 9.1.2.1 GigabitEthernet2/0/0 9.1.2.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet2/0/0 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 - (Optional) Configure automatic route summarization.
BGP is used to transmit routing information on large-scale networks. BGP route summarization can be configured to simplify routing tables of devices on these networks.
# Configure Router B.
[RouterB] bgp 65009[RouterB-bgp] ipv4-family unicast[RouterB-bgp-af-ipv4] summary automatic# View the routing table of Router A.
[RouterA] display bgp routing-tableBGP Local router ID is 1.1.1.1
Status codes: * - valid, > - best, d - damped,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
Total Number of Routes: 2
Network NextHop MED LocPrf PrefVal Path/Ogn
*> 8.1.1.0/24 0.0.0.0 0 0 i
*> 9.0.0.0 3.1.1.1 0 65009?
# Run the ping -a 8.1.1.1 9.1.2.1 command on Router A.
[RouterA] ping -a 8.1.1.1 9.1.2.1PING 9.1.2.1: 56 data bytes, press CTRL_C to break
Reply from 9.1.2.1: bytes=56 Sequence=1 ttl=254 time=15 ms
Reply from 9.1.2.1: bytes=56 Sequence=2 ttl=254 time=31 ms
Reply from 9.1.2.1: bytes=56 Sequence=3 ttl=254 time=47 ms
Reply from 9.1.2.1: bytes=56 Sequence=4 ttl=254 time=46 ms
Reply from 9.1.2.1: bytes=56 Sequence=5 ttl=254 time=47 ms
--- 9.1.2.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 15/37/47 ms
Configuration Files
Configuration file of Router A
#
sysname Router A#
interface GigabitEthernet1/0/0
ip address 8.1.1.1 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 3.1.1.2 255.255.255.0
#
bgp 65008
router-id 1.1.1.1
peer 3.1.1.1 as-number 65009
#
ipv4-family unicast
undo synchronization
network 8.1.1.0 255.255.255.0
peer 3.1.1.1 enable
#
return
Configuration file of Router B
#
sysname Router B#
interface GigabitEthernet1/0/0
ip address 9.1.1.1 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 3.1.1.1 255.255.255.0
#
bgp 65009
router-id 2.2.2.2
peer 3.1.1.2 as-number 65008
#
ipv4-family unicast
undo synchronization
summary automatic
import-route ospf 1
peer 3.1.1.2 enable
#
ospf 1
import-route bgp
area 0.0.0.0
network 9.1.1.0 0.0.0.255
#
return
Configuration file of Router C
#
sysname Router C#
interface GigabitEthernet1/0/0
ip address 9.1.1.2 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 9.1.2.1 255.255.255.0
#
ospf 1
area 0.0.0.0
network 9.1.1.0 0.0.0.255
network 9.1.2.0 0.0.0.255
#
return
