Example for Configuring Basic BGP4+ Functions

Before building BGP4+ networks, you need to configure basic BGP4+ functions.

Networking Requirements

In Figure 1, there are two ASs: AS 65008 and AS 65009. Device A is in AS 65008, and Device B, Device C, and Device D are in AS 65009. BGP4+ must be configured to exchange routing information between the two ASs.

Figure 1 Configuring basic BGP4+ functions

Interfaces 1 through 4 in this example are GE 0/1/0, GE 0/1/8, GE 0/1/16, GE 0/1/0, respectively.

Configuration Roadmap

The configuration roadmap is as follows:

Configure IBGP connections between Device B, Device C, and Device D.
Configure an EBGP relationship between Device A and Device B.

Data Preparation

To complete the configuration, you need the following data:

Router IDs of Device A, Device B, Device C, and Device D
AS numbers of Device A, Device B, Device C, and Device D

Procedure

Configure an IPv6 address for each interface. For configuration details, see Configuration Files in this section.

Configure IBGP connections.

# Configure Device B.

[~DeviceB] bgp 65009
[*DeviceB-bgp] router-id 2.2.2.2
[*DeviceB-bgp] peer 2001:db8:9:1::2 as-number 65009
[*DeviceB-bgp] peer 2001:db8:9:3::2 as-number 65009
[*DeviceB-bgp] ipv6-family unicast
[*DeviceB-bgp-af-ipv6] peer 2001:db8:9:1::2 enable
[*DeviceB-bgp-af-ipv6] peer 2001:db8:9:3::2 enable
[*DeviceB-bgp-af-ipv6] network 2001:db8:9:1:: 64
[*DeviceB-bgp-af-ipv6] network 2001:db8:9:3:: 64
[*DeviceB-bgp-af-ipv6] commit
[~DeviceB-bgp-af-ipv6] quit
[~DeviceB-bgp] quit

# Configure Device C.

[~DeviceC] bgp 65009
[*DeviceC-bgp] router-id 3.3.3.3
[*DeviceC-bgp] peer 2001:db8:9:3::1 as-number 65009
[*DeviceC-bgp] peer 2001:db8:9:2::2 as-number 65009
[*DeviceC-bgp] ipv6-family unicast
[*DeviceC-bgp-af-ipv6] peer 2001:db8:9:3::1 enable
[*DeviceC-bgp-af-ipv6] peer 2001:db8:9:2::2 enable
[*DeviceC-bgp-af-ipv6] network 2001:db8:9:3:: 64
[*DeviceC-bgp-af-ipv6] network 2001:db8:9:2:: 64
[*DeviceC-bgp-af-ipv6] commit
[~DeviceC-bgp-af-ipv6] quit
[~DeviceC-bgp] quit

# Configure Device D.

[~DeviceD] bgp 65009
[*DeviceD-bgp] router-id 4.4.4.4
[*DeviceD-bgp] peer 2001:db8:9:1::1 as-number 65009
[*DeviceD-bgp] peer 2001:db8:9:2::1 as-number 65009
[*DeviceD-bgp] ipv6-family unicast
[*DeviceD-bgp-af-ipv6] peer 2001:db8:9:1::1 enable
[*DeviceD-bgp-af-ipv6] peer 2001:db8:9:2::1 enable
[*DeviceD-bgp-af-ipv6] network 2001:db8:9:2:: 64
[*DeviceD-bgp-af-ipv6] network 2001:db8:9:1:: 64
[*DeviceD-bgp-af-ipv6] commit
[~DeviceD-bgp-af-ipv6] quit
[~DeviceD-bgp] quit

Configure an EBGP connection.

# Configure Device A.

[~DeviceA] bgp 65008
[*DeviceA-bgp] router-id 1.1.1.1
[*DeviceA-bgp] peer 2001:db8:10::1 as-number 65009
[*DeviceA-bgp] ipv6-family unicast
[*DeviceA-bgp-af-ipv6] peer 2001:db8:10::1 enable
[*DeviceA-bgp-af-ipv6] network 2001:db8:10:: 64
[*DeviceA-bgp-af-ipv6] network 2001:db8:8:: 64
[*DeviceA-bgp-af-ipv6] commit
[~DeviceA-bgp-af-ipv6] quit
[~DeviceA-bgp] quit

# Configure Device B.

[~DeviceB] bgp 65009
[*DeviceB-bgp] peer 2001:db8:10::2 as-number 65008
[*DeviceB-bgp] ipv6-family unicast
[*DeviceB-bgp-af-ipv6] peer 2001:db8:10::2 enable
[*DeviceB-bgp-af-ipv6] network 2001:db8:10:: 64
[*DeviceB-bgp-af-ipv6] commit
[~DeviceB-bgp-af-ipv6] quit
[~DeviceB-bgp] quit

Verify the configuration.

# Check the status of BGP4+ connections.

[~DeviceB] display bgp ipv6 peer
 BGP 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
  2001:db8:9:1::2 4 65009        8        9     0 00:05:37 Established       2
  2001:db8:9:3::2 4 65009        2        2     0 00:00:09 Established       2
  2001:db8:10::2  4 65008        9        7     0 00:05:38 Established       2

The preceding command output shows that BGP4+ connections have been established between Device B and other routers.

# Display the routing table of Device A.

[~DeviceA] display bgp ipv6 routing-table
 BGP Local router ID is 1.1.1.1
 Status codes: * - valid, > - best, d - damped, x - best external, a - add path,
               h - history,  i - internal, s - suppressed, S - Stale
               Origin : i - IGP, e - EGP, ? - incomplete
 RPKI validation codes: V - valid, I - invalid, N - not-found
 Total Number of Routes: 6
 *>  Network  : 2001:db8:8::                             PrefixLen : 64
     NextHop  : ::                                       LocPrf    :
     MED      : 0                                        PrefVal   : 0
     Label    :
     Path/Ogn : i
 *>  Network  : 2001:db8:9:1::                           PrefixLen : 64
     NextHop  : 2001:db8:10::1                           LocPrf    :
     MED      : 0                                        PrefVal   : 0
     Label    :
     Path/Ogn : 65009 i
 *>  Network  : 2001:db8:9:2::                           PrefixLen : 64
     NextHop  : 2001:db8:10::1                           LocPrf    :
     MED      :                                          PrefVal   : 0
     Label    :
     Path/Ogn : 65009 i
 *>  Network  : 2001:db8:9:3::                           PrefixLen : 64
     NextHop  : 2001:db8:10::1                           LocPrf    :
     MED      : 0                                        PrefVal   : 0
     Label    :
     Path/Ogn : 65009 i
 *>  Network  : 2001:db8:10::                            PrefixLen : 64
     NextHop  : ::                                       LocPrf    :
     MED      : 0                                        PrefVal   : 0
     Label    :
     Path/Ogn : i
  *
     NextHop  : 2001:db8:10::1                           LocPrf    :
     MED      : 0                                        PrefVal   : 0
     Label    :
     Path/Ogn : 65009 i

The preceding command output shows that Device A has learned routes from its peer in AS 65009. AS 65008 and AS 65009 can exchange routing information.

Configuration Files

Device A configuration file

#
sysname DeviceA
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:8::1/64
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:10::2/64
#
bgp 65008
 router-id 1.1.1.1
 peer 2001:db8:10::1 as-number 65009
 #
 ipv4-family unicast
  undo synchronization 
 #
 ipv6-family unicast
  network 2001:db8:8:: 64
  network 2001:db8:10:: 64
  peer 2001:db8:10::1 enable
#
return

Device B configuration file

#
sysname DeviceB
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:1::1/64
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:10::1/64
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:3::1/64
#
bgp 65009
 router-id 2.2.2.2
 peer 2001:db8:9:1::2 as-number 65009
 peer 2001:db8:9:3::2 as-number 65009
 peer 2001:db8:10::2 as-number 65008
 #
 ipv4-family unicast
  undo synchronization 
 #
 ipv6-family unicast
  network 2001:db8:9:1:: 64
  network 2001:db8:9:3:: 64
  network 2001:db8:10:: 64
  peer 2001:db8:9:1::2 enable
  peer 2001:db8:9:3::2 enable
  peer 2001:db8:10::2 enable
#
return

Device C configuration file

#
sysname DeviceC
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:2::1/64
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:3::2/64
#
bgp 65009
 router-id 3.3.3.3
 peer 2001:db8:9:2::2 as-number 65009
 peer 2001:db8:9:3::1 as-number 65009
 #
 ipv4-family unicast
  undo synchronization 
 #
 ipv6-family unicast
  network 2001:db8:9:2:: 64
  network 2001:db8:9:3:: 64
  peer 2001:db8:9:2::2 enable
  peer 2001:db8:9:3::1 enable
#
return

Device D configuration file

#
sysname DeviceD
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:1::2/64
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:9:2::2/64
#
bgp 65009
 router-id 4.4.4.4
 peer 2001:db8:9:1::1 as-number 65009
 peer 2001:db8:9:2::1 as-number 65009
 #
 ipv4-family unicast
  undo synchronization 
 #
 ipv6-family unicast
  network 2001:db8:9:1:: 64
  network 2001:db8:9:2:: 64
  peer 2001:db8:9:1::1 enable
  peer 2001:db8:9:2::1 enable
#
return