Example for Configuring Multi-hop BFD for IPv6

This section provides an example for configuring multi-hop BFD for IPv6 to detect faults in an IPv6 link on a network.

Networking Requirements

To rapidly detect faults in an IPv6 link on a network, establish a multi-hop BFD session for IPv6. On the network shown in Figure 1, a multi-hop BFD session in asynchronous mode is established to detect faults in the link between Device A and Device C.

Figure 1 Multi-hop BFD for IPv6

Interfaces 1 and 2 in this example represent GE 0/1/0, and GE 0/1/8, respectively.

Precautions

BFD sessions for IPv6 must be established on both ends.

Configuration Roadmap

The configuration roadmap is as follows:

Enable BFD globally on Device A and Device C.
Configure multi-hop BFD for IPv6 on Device A to detect faults in the link from Device A to Device C.
Configure multi-hop BFD for IPv6 on Device C to detect faults in the link from Device C to Device A.

Data Preparation

To complete the configuration, you need the following data:

Peer IPv6 address monitored by BFD
Local and remote discriminators of BFD sessions
BFD session names

Procedure

Assign an IPv6 address to each interface on Device A, Device B, and Device C, and configure Open Shortest Path First version 3 (OSPFv3) to ensure that these devices communicate with each other.

# Configure Device A.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] ospfv3 1
[*DeviceA-ospfv3-1] router-id 1.1.1.1
[*DeviceA-ospfv3-1] area 0
[*DeviceA-ospfv3-1-area-0.0.0.0] quit
[*DeviceA-ospfv3-1] quit
[DeviceA] interface gigabitethernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] undo shutdown
[*DeviceA-GigabitEthernet0/1/0] ipv6 enable
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8:1::1 64
[*DeviceA-GigabitEthernet0/1/0] ospfv3 1 area 0
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

# Configure Device B.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] ospfv3 1
[*DeviceB-ospfv3-1] router-id 2.2.2.2
[*DeviceB-ospfv3-1] area 0
[*DeviceB-ospfv3-1-area-0.0.0.0] quit
[*DeviceB-ospfv3-1] quit
[~DeviceB] interface gigabitethernet 0/1/0
[*DeviceB-GigabitEthernet0/1/0] undo shutdown
[*DeviceB-GigabitEthernet0/1/0] ipv6 enable
[*DeviceB-GigabitEthernet0/1/0] ipv6 address 2001:db8:1::2 64
[*DeviceB-GigabitEthernet0/1/0] ospfv3 1
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit
[~DeviceB] interface gigabitethernet 0/1/8
[~DeviceB-GigabitEthernet0/1/8] undo shutdown
[*DeviceB-GigabitEthernet0/1/8] ipv6 enable
[*DeviceB-GigabitEthernet0/1/8] ipv6 address 2001:db8:2::1 64
[*DeviceB-GigabitEthernet0/1/8] ospfv3 1 area 0
[*DeviceB-GigabitEthernet0/1/8] commit
[~DeviceB-GigabitEthernet0/1/8] quit

# Configure Device C.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceC
[*HUAWEI] commit
[~DeviceC] ospfv3 1
[*DeviceC-ospfv3-1] router-id 3.3.3.3
[*DeviceC-ospfv3-1] area 0
[*DeviceC-ospfv3-1-area-0.0.0.0] quit
[*DeviceC-ospfv3-1] quit
[~DeviceC] interface gigabitethernet 0/1/8
[*DeviceC-GigabitEthernet0/1/8] undo shutdown
[*DeviceC-GigabitEthernet0/1/8] ipv6 enable
[*DeviceC-GigabitEthernet0/1/8] ipv6 address 2001:db8:2::2 64
[*DeviceC-GigabitEthernet0/1/8] ospfv3 1 area 0
[*DeviceC-GigabitEthernet0/1/8] commit
[~DeviceC-GigabitEthernet0/1/8] quit

After the configuration is complete, Device A and Device C can ping each other. The following example uses the command output on Device A.

[~DeviceA] ping ipv6 2001:db8:2::2
PING 2001:db8:2::2 : 56  data bytes, press CTRL_C to break
    Reply from 2001:db8:2::2
    bytes=56 Sequence=1 hop limit=64 time=22 ms
    Reply from 2001:db8:2::2
    bytes=56 Sequence=2 hop limit=64 time=1 ms
    Reply from 2001:db8:2::2
    bytes=56 Sequence=3 hop limit=64 time=1 ms
    Reply from 2001:db8:2::2
    bytes=56 Sequence=4 hop limit=64 time=1 ms

    Reply from 2001:db8:2::2
    bytes=56 Sequence=5 hop limit=64 time=1 ms
  ---2001:db8:2::2 ping statistics---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max=1/5/22 ms

Configure multi-hop BFD for IPv6 on Device A and Device C.

# Configure Device A.

[~DeviceA] bfd
[*DeviceA-bfd] quit
[*DeviceA] bfd ipv6session bind peer-ipv6 2001:db8:2::2
[*DeviceA-bfd-session-ipv6session] discriminator local 1
[*DeviceA-bfd-session-ipv6session] discriminator remote 2
[*DeviceA-bfd-session-ipv6session] commit
[~DeviceA-bfd-session-ipv6session] quit

# Configure Device C.

[~DeviceC] bfd
[*DeviceC-bfd] quit
[*DeviceC] bfd ipv6session bind peer-ipv6 2001:db8:1::1
[*DeviceC-bfd-session-ipv6session] discriminator local 2
[*DeviceC-bfd-session-ipv6session] discriminator remote 1
[*DeviceC-bfd-session-ipv6session] commit
[~DeviceC-bfd-session-ipv6session] quit

Verify the configuration.

After completing the configurations, run the display bfd session all verbose command on Device A or Device C. The command output shows that a multi-hop BFD session for IPv6 has been established and its status is Up. The following example uses the command output on Device A.

[~DeviceA] display bfd session all verbose
(w): State in WTR  (*): State is invalid
------------------------------------------------------------------------------
  (Multi Hop) State : UP                  Name : ipv6session
------------------------------------------------------------------------------
  Local Discriminator    : 1                Remote Discriminator   : 2
  Session Detect Mode    : Asynchronous Mode Without Echo Function
  BFD Bind Type          : Peer IP Address
  Bind Session Type      : Static
  Bind Peer IP Address   : 2001:db8:2::2
  Bind Interface         : -
  FSM Board Id           : 1                TOS-EXP                : 7
  Min Tx Interval (ms)   : 10               Min Rx Interval (ms)   : 10
  Actual Tx Interval (ms): 10               Actual Rx Interval (ms): 10
  Local Detect Multi     : 3                Detect Interval (ms)   : 30
  Echo Passive           : Disable          Acl Number             : -
  Destination Port       : 4784             TTL                    : 254
  Proc Interface Status  : Disable          Process PST            : Disable
  WTR Interval (ms)      : 0                Config PST             : Disable
  Active Multi           : 3
  Last Local Diagnostic  : No Diagnostic
  Bind Application       : No Application Bind
  Session TX TmrID       : 2720409460       Session Detect TmrID   : -
  Session Init TmrID     : -                Session WTR TmrID      : -
  Session Echo Tx TmrID  : -
  Session Description    : -
------------------------------------------------------------------------------

     Total UP/DOWN Session Number : 1/0

Configuration Files

Device A configuration file

#
sysname DeviceA
#
bfd
#
ospfv3 1
 router-id 1.1.1.1
 area 0.0.0.0
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::1/64
 ospfv3 1 area 0.0.0.0
#
bfd ipv6session bind peer-ipv6 2001:db8:2::2
 discriminator local 1
 discriminator remote 2
return

Device B configuration file

#
sysname DeviceB
#
ospfv3 1
 router-id 2.2.2.2
 area 0.0.0.0
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::2/64
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::1/64
 ospfv3 1 area 0.0.0.0
return

Device C configuration file

#
sysname DeviceC
#
bfd
#
ospfv3 1
 router-id 3.3.3.3
 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::2/64
 ospfv3 1 area 0.0.0.0
#
bfd ipv6session bind peer-ipv6 2001:db8:1::1
 discriminator local 2
 discriminator remote 1
return