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Example for Configuring Basic BGP Functions
Networking Requirements
As shown in Figure 9-26, BGP runs between Routers; an EBGP connection is established between Router A and Router B; IBGP full-mesh connections are established between Router B, Router C, and Router D.
Configuration Roadmap
The configuration roadmap is as follows:
- Configure IBGP connections between Router B, Router C, and Router D.
- Configure an EBGP connection between Router A and Router B.
Procedure
- Configure an IP address for each interface.
# Configure Router A.
<Huawei> system-view[Huawei] sysname RouterA[RouterA] interface gigabitethernet 1/0/0[RouterA-GigabitEthernet1/0/0] ip address 8.1.1.1 8[RouterA-GigabitEthernet1/0/0] quitThe configurations of Router B, Router C, and Router D are similar to the configuration of Router A, and are not mentioned here.
- Configure IBGP connections.
# Configure Router B.
[RouterB] bgp 65009[RouterB-bgp] router-id 2.2.2.2[RouterB-bgp] peer 9.1.1.2 as-number 65009[RouterB-bgp] peer 9.1.3.2 as-number 65009# Configure Router C.
[RouterC] bgp 65009[RouterC-bgp] router-id 3.3.3.3[RouterC-bgp] peer 9.1.3.1 as-number 65009[RouterC-bgp] peer 9.1.2.2 as-number 65009[RouterC-bgp] quit# Configure Router D.
[RouterD] bgp 65009[RouterD-bgp] router-id 4.4.4.4[RouterD-bgp] peer 9.1.1.1 as-number 65009[RouterD-bgp] peer 9.1.2.1 as-number 65009[RouterD-bgp] quit - Configure an EBGP connection.
# Configure Router A.
[RouterA] bgp 65008[RouterA-bgp] router-id 1.1.1.1[RouterA-bgp] peer 200.1.1.1 as-number 65009# Configure Router B.
[RouterB-bgp] peer 200.1.1.2 as-number 65008# View the status of BGP peers.
[RouterB-bgp] display bgp peerBGP local router ID : 2.2.2.2
Local AS number : 65009
Total number of peers : 3 Peers in established state : 3
Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv
9.1.1.2 4 65009 49 62 0 00:44:58 Established 0
9.1.3.2 4 65009 56 56 0 00:40:54 Established 0
200.1.1.2 4 65008 49 65 0 00:44:03 Established 1
The preceding command output shows that BGP connections have been established between Router B and other Routers.
- Configure Router A to advertise route 8.0.0.0/8.
# Configure Router A to advertise a route.
[RouterA-bgp] ipv4-family unicast[RouterA-bgp-af-ipv4] network 8.0.0.0 255.0.0.0[RouterA-bgp-af-ipv4] quit# View the routing table of Router A.
[RouterA-bgp] 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: 1 Network NextHop MED LocPrf PrefVal Path/Ogn *> 8.0.0.0 0.0.0.0 0 0 i# View the routing table of Router B.
[RouterB-bgp] display bgp routing-tableBGP Local router ID is 2.2.2.2 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 1 Network NextHop MED LocPrf PrefVal Path/Ogn *> 8.0.0.0 200.1.1.2 0 0 65008i# View the routing table of Router C.
[RouterC] display bgp routing-tableBGP Local router ID is 3.3.3.3 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 1 Network NextHop MED LocPrf PrefVal Path/Ogn i 8.0.0.0 200.1.1.2 0 100 0 65008i![]()
The preceding command output shows that Router C has learned the route to destination 8.0.0.0 in AS 65008. The route, however, is invalid because the next hop 200.1.1.2 of this route is unreachable.
- Configure BGP to import direct routes.
# Configure Router B.
[RouterB-bgp] ipv4-family unicast[RouterB-bgp-af-ipv4] import-route direct# View the BGP routing table of Router A.
[RouterA-bgp] 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: 4 Network NextHop MED LocPrf PrefVal Path/Ogn *> 8.0.0.0 0.0.0.0 0 0 i *> 9.1.1.0/24 200.1.1.1 0 0 65009? *> 9.1.3.0/24 200.1.1.1 0 0 65009? 200.1.1.0 200.1.1.1 0 0 65009?# View the BGP routing table of Router C.
[RouterC] display bgp routing-tableBGP Local router ID is 3.3.3.3 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 4 Network NextHop MED LocPrf PrefVal Path/Ogn *>i 8.0.0.0 200.1.1.2 0 100 0 65008i *>i 9.1.1.0/24 9.1.3.1 0 100 0 ? i 9.1.3.0/24 9.1.3.1 0 100 0 ? *>i 200.1.1.0 9.1.3.1 0 100 0 ?The preceding command output shows that the route to destination 8.0.0.0 becomes valid because the next-hop address of this route is the address of Router A.
# Run the ping command on Router C.
[RouterC] ping 8.1.1.1PING 8.1.1.1: 56 data bytes, press CTRL_C to break
Reply from 8.1.1.1: bytes=56 Sequence=1 ttl=254 time=31 ms
Reply from 8.1.1.1: bytes=56 Sequence=2 ttl=254 time=47 ms
Reply from 8.1.1.1: bytes=56 Sequence=3 ttl=254 time=31 ms
Reply from 8.1.1.1: bytes=56 Sequence=4 ttl=254 time=16 ms
Reply from 8.1.1.1: bytes=56 Sequence=5 ttl=254 time=31 ms
--- 8.1.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 16/31/47 ms
Configuration Files
Configuration file of Router A
#
sysname RouterA#
interface GigabitEthernet1/0/0
ip address 8.1.1.1 255.0.0.0
#
interface GigabitEthernet2/0/0
ip address 200.1.1.2 255.255.255.0
#
bgp 65008
router-id 1.1.1.1
peer 200.1.1.1 as-number 65009
#
ipv4-family unicast
undo synchronization
network 8.0.0.0
peer 200.1.1.1 enable
#
return
Configuration file of Router B
#
sysname RouterB#
interface GigabitEthernet1/0/0
ip address 9.1.1.1 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 200.1.1.1 255.255.255.0
#
interface GigabitEthernet3/0/0
ip address 9.1.3.1 255.255.255.0
#
bgp 65009
router-id 2.2.2.2
peer 9.1.1.2 as-number 65009
peer 9.1.3.2 as-number 65009
peer 200.1.1.2 as-number 65008
#
ipv4-family unicast
undo synchronization
import-route direct
peer 9.1.1.2 enable
peer 9.1.3.2 enable
peer 200.1.1.2 enable
#
return
Configuration file of Router C
#
sysname RouterC#
interface GigabitEthernet2/0/0
ip address 9.1.2.1 255.255.255.0
#
interface GigabitEthernet3/0/0
ip address 9.1.3.2 255.255.255.0
#
bgp 65009
router-id 3.3.3.3
peer 9.1.2.2 as-number 65009
peer 9.1.3.1 as-number 65009
#
ipv4-family unicast
undo synchronization
peer 9.1.2.2 enable
peer 9.1.3.1 enable
#
return
Configuration file of Router D
#
sysname RouterD#
interface GigabitEthernet1/0/0
ip address 9.1.1.2 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 9.1.2.2 255.255.255.0
#
bgp 65009
router-id 4.4.4.4
peer 9.1.1.1 as-number 65009
peer 9.1.2.1 as-number 65009
#
ipv4-family unicast
undo synchronization
peer 9.1.1.1 enable
peer 9.1.2.1 enable
#
return
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