Example for Configuring Single-hop BFD for IPv6

This section provides an example for configuring single-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 single-hop BFD session for IPv6. On the network shown in Figure 1, a single-hop BFD session in asynchronous mode is established to detect faults in the link between Device A and Device B.

Figure 1 Single-hop BFD for IPv6

Interfaces 1 in this example are GE 0/1/0.

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 B.
Create single-hop BFD sessions for IPv6 and bind them to the outbound interfaces on Device A and Device B.

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 IPv6 addresses to interfaces connecting Device A and Device B.

# Assign an IPv6 address to the interface on Device A.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~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 32
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

# Assign an IPv6 address to the interface on Device B.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~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::2 32
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit

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

[~DeviceA] ping ipv6 2001:db8::2
PING 2001:db8::2 : 56  data bytes, press CTRL_C to break
    Reply from 2001:db8::2
    bytes=56 Sequence=1 hop limit=64 time=3 ms
    Reply from 2001:db8::2
    bytes=56 Sequence=2 hop limit=64 time=1 ms
    Reply from 2001:db8::2
    bytes=56 Sequence=3 hop limit=64 time=1 ms
    Reply from 2001:db8::2
    bytes=56 Sequence=4 hop limit=64 time=1 ms
    Reply from 2001:db8::2
    bytes=56 Sequence=5 hop limit=64 time=1 ms
  ---2001:db8::2 ping statistics---
    5 packet(s) transmitted
    5 packet(s) received
    0.00% packet loss
    round-trip min/avg/max=1/1/3 ms

Configure single-hop BFD for IPv6.

# Configure Device A.

[~DeviceA] bfd
[*DeviceA-bfd] quit
[*DeviceA] bfd ipv6session bind peer-ipv6 2001:db8::2 interface gigabitethernet 0/1/0
[*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 B.

[~DeviceB] bfd
[*DeviceB-bfd] quit
[*DeviceB] bfd ipv6session bind peer-ipv6 2001:db8::1 interface gigabitethernet 0/1/0
[*DeviceB-bfd-session-ipv6session] discriminator local 2
[*DeviceB-bfd-session-ipv6session] discriminator remote 1
[*DeviceB-bfd-session-ipv6session] commit
[~DeviceB-bfd-session-ipv6session] quit

Verify the configuration.

After completing the configurations, run the display bfd session all verbose command on Device A or Device B. The command output shows that a single-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
------------------------------------------------------------------------------
  (One Hop)   State : Up                    Name : ipv6session
------------------------------------------------------------------------------
  Local Discriminator    : 1                Remote Discriminator   : 2
  Session Detect Mode    : Asynchronous Mode Without Echo Function
  BFD Bind Type          : Interface(GigabitEthernet0/1/0)
  Bind Session Type      : Static
  Bind Peer IP Address   : 2001:db8::2
  Bind Interface         : GigabitEthernet0/1/0
  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       : 3784             TTL                    : 255
  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       : 0                Session Detect TmrID   : 0
  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
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8::1/32
#
bfd ipv6session bind peer-ipv6 2001:db8::2 interface GigabitEthernet0/1/0
 discriminator local 1
 discriminator remote 2
#
return

Device B configuration file

#
sysname DeviceB
#
bfd
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8::2/32
#
bfd ipv6session bind peer-ipv6 2001:db8::1 interface GigabitEthernet0/1/0
 discriminator local 2
 discriminator remote 1
#
return