Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document.
Note: Even the most advanced machine translation cannot match the quality of professional translators.
Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Example for Configuring a BGP Confederation
Networking Requirements
As shown in Figure 9-34, there are multiple BGP routers in AS 200. It is required that the number of IBGP connections be reduced.
Configuration Roadmap
The configuration roadmap is as follows:
Configure a BGP confederation on each router in AS 200 to divide AS 200 into three sub-ASs: AS 65001, AS 65002, and AS 65003. Three routers in AS 65001 establish full-mesh IBGP connections to reduce the number of IBGP connections.
Procedure
- Configure an IP address to each interface.
# Configure IP addresses for all interfaces of RouterA.
<Huawei> system-view [Huawei] sysname RouterA [RouterA] interface gigabitethernet 0/0/1 [RouterA-GigabitEthernet0/0/1] ip address 10.1.4.1 255.255.255.0 [RouterA-GigabitEthernet0/0/1] quit [RouterA] interface gigabitethernet 1/0/0 [RouterA-GigabitEthernet1/0/0] ip address 200.1.1.1 255.255.255.0 [RouterA-GigabitEthernet1/0/0] quit [RouterA] interface gigabitethernet 2/0/0 [RouterA-GigabitEthernet2/0/0] ip address 10.1.1.1 255.255.255.0 [RouterA-GigabitEthernet2/0/0] quit [RouterA] interface gigabitethernet 3/0/0 [RouterA-GigabitEthernet3/0/0] ip address 10.1.2.1 255.255.255.0 [RouterA-GigabitEthernet3/0/0] quit [RouterA] interface gigabitethernet 4/0/0 [RouterA-GigabitEthernet4/0/0] ip address 10.1.3.1 255.255.255.0 [RouterA-GigabitEthernet4/0/0] quit
The configurations of RouterB, RouterC, RouterD, RouterE and RouterF are similar to the configuration of RouterA, and are not mentioned here.
- Configure the BGP confederation.
# Configure Router A.
[RouterA] bgp 65001[RouterA-bgp] router-id 1.1.1.1[RouterA-bgp] confederation id 200[RouterA-bgp] confederation peer-as 65002 65003[RouterA-bgp] peer 10.1.1.2 as-number 65002[RouterA-bgp] peer 10.1.2.2 as-number 65003[RouterA-bgp] ipv4-family unicast[RouterA-bgp-af-ipv4] peer 10.1.1.2 next-hop-local[RouterA-bgp-af-ipv4] peer 10.1.2.2 next-hop-local[RouterA-bgp-af-ipv4] quit# Configure Router B.
[RouterB] bgp 65002[RouterB-bgp] router-id 2.2.2.2[RouterB-bgp] confederation id 200[RouterB-bgp] confederation peer-as 65001[RouterB-bgp] peer 10.1.1.1 as-number 65001[RouterB-bgp] quit# Configure Router C.
[RouterC] bgp 65003[RouterC-bgp] router-id 3.3.3.3[RouterC-bgp] confederation id 200[RouterC-bgp] confederation peer-as 65001[RouterC-bgp] peer 10.1.2.1 as-number 65001[RouterC-bgp] quit - Configure IBGP connections inside AS 65001.
# Configure Router A.
[RouterA] bgp 65001[RouterA-bgp] peer 10.1.3.2 as-number 65001[RouterA-bgp] peer 10.1.4.2 as-number 65001[RouterA-bgp] ipv4-family unicast[RouterA-bgp-af-ipv4] peer 10.1.3.2 next-hop-local[RouterA-bgp-af-ipv4] peer 10.1.4.2 next-hop-local[RouterA-bgp-af-ipv4] quit# Configure Router D.
[RouterD] bgp 65001[RouterD-bgp] router-id 4.4.4.4[RouterD-bgp] confederation id 200[RouterD-bgp] peer 10.1.3.1 as-number 65001[RouterD-bgp] peer 10.1.5.2 as-number 65001[RouterD-bgp] quit# Configure Router E.
[RouterE] bgp 65001[RouterE-bgp] router-id 5.5.5.5[RouterE-bgp] confederation id 200[RouterE-bgp] peer 10.1.4.1 as-number 65001[RouterE-bgp] peer 10.1.5.1 as-number 65001[RouterE-bgp] quit - Configure the EBGP connection between AS 100 and AS 200.
# Configure Router A.
[RouterA] bgp 65001[RouterA-bgp] peer 200.1.1.2 as-number 100[RouterA-bgp] quit# Configure Router F.
[RouterF] bgp 100[RouterF-bgp] router-id 6.6.6.6[RouterF-bgp] peer 200.1.1.1 as-number 200[RouterF-bgp] ipv4-family unicast[RouterF-bgp-af-ipv4] network 9.1.1.0 255.255.255.0[RouterF-bgp-af-ipv4] quit - Verify the configuration.
# Check the routing table of Router B.
[RouterB] 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
*>i 9.1.1.0/24 10.1.1.1 0 100 0 (65001) 100i
[RouterB] display bgp routing-table 9.1.1.0BGP local router ID : 2.2.2.2 Local AS number : 65002 Paths: 1 available, 1 best, 1 select BGP routing table entry information of 9.1.1.0/24: From: 10.1.1.1 (1.1.1.1) Route Duration: 00h12m29s Relay IP Nexthop: 0.0.0.0 Relay IP Out-Interface: GigabitEthernet1/0/0 Original nexthop: 10.1.1.1 Qos information : 0x0 AS-path (65001) 100, origin igp, MED 0, localpref 100, pref-val 0, valid, external-confed, best, select, active, pre 255 Not advertised to any peer yet
# Check the BGP routing table of Router D.
[RouterD] display bgp routing-tableBGP Local router ID is 4.4.4.4
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 9.1.1.0/24 10.1.3.1 0 100 0 100i
[RouterD] display bgp routing-table 9.1.1.0BGP local router ID : 4.4.4.4 Local AS number : 65001 Paths: 1 available, 1 best, 1 select BGP routing table entry information of 9.1.1.0/24: From: 10.1.3.1 (1.1.1.1) Route Duration: 00h23m57s Relay IP Nexthop: 0.0.0.0 Relay IP Out-Interface: GigabitEthernet1/0/0 Original nexthop: 10.1.3.1 Qos information : 0x0 AS-path 100, origin igp, MED 0, localpref 100, pref-val 0, valid, internal-confed, best, select, active, pre 255 Not advertised to any peer yet
Configuration Files
Configuration file of Router A
#
sysname RouterA#
interface GigabitEthernet0/0/1
ip address 10.1.4.1 255.255.255.0
#
interface GigabitEthernet1/0/0
ip address 200.1.1.1 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 10.1.1.1 255.255.255.0
#
interface GigabitEthernet3/0/0
ip address 10.1.2.1 255.255.255.0
#
interface GigabitEthernet4/0/0
ip address 10.1.3.1 255.255.255.0
#
bgp 65001
router-id 1.1.1.1
confederation id 200
confederation peer-as 65002 65003
peer 200.1.1.2 as-number 100
peer 10.1.1.2 as-number 65002
peer 10.1.2.2 as-number 65003
peer 10.1.3.2 as-number 65001
peer 10.1.4.2 as-number 65001
#
ipv4-family unicast
undo synchronization
peer 200.1.1.2 enable
peer 10.1.1.2 enable
peer 10.1.1.2 next-hop-local
peer 10.1.2.2 enable
peer 10.1.2.2 next-hop-local
peer 10.1.3.2 enable
peer 10.1.3.2 next-hop-local
peer 10.1.4.2 enable
peer 10.1.4.2 next-hop-local
#
return
Configuration file of Router B
#
sysname RouterB#
interface GigabitEthernet1/0/0
ip address 10.1.1.2 255.255.255.0
#
bgp 65002
router-id 2.2.2.2
confederation id 200
confederation peer-as 65001
peer 10.1.1.1 as-number 65001
#
ipv4-family unicast
undo synchronization
peer 10.1.1.1 enable
#
return
The configuration file of Router C is similar to that of Router B, and is not mentioned here.
Configuration file of Router D
#
sysname RouterD#
interface GigabitEthernet1/0/0
ip address 10.1.3.2 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 10.1.5.1 255.255.255.0
#
bgp 65001
router-id 4.4.4.4
confederation id 200
peer 10.1.3.1 as-number 65001
peer 10.1.5.2 as-number 65001
#
ipv4-family unicast
undo synchronization
peer 10.1.3.1 enable
peer 10.1.5.2 enable
#
return
The configuration file of Router E is similar to that of Router D, and is not mentioned here.
Configuration file of Router F
#
sysname RouterF#
interface GigabitEthernet1/0/0
ip address 200.1.1.2 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 9.1.1.1 255.255.255.0
#
bgp 100
router-id 6.6.6.6
peer 200.1.1.1 as-number 200
#
ipv4-family unicast
undo synchronization
network 9.1.1.0 255.255.255.0
peer 200.1.1.1 enable
#
return
