Example for Configuring the BFD Echo Function

Networking Requirements

As shown in Figure 1, SwitchA connects to SwitchB through a direct link. SwitchA supports BFD, whereas SwitchB does not support BFD. Faults on the link between SwitchA and SwitchB need to be fast detected.

Figure 1 Networking diagram for configuring the BFD Echo function

Configuration Roadmap

The configuration roadmap is as follows:

Configure the BFD Echo function on SwitchA to detect faults on the link between SwitchA and SwitchB.

Procedure

On SwitchA and SwitchB, create VLANs, and configure GE0/0/1 interfaces as hybrid interfaces and add the interfaces to VLANs.

# Configure SwitchA.

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan 13
[SwitchA-vlan13] quit
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type hybrid
[SwitchA-GigabitEthernet0/0/1] port hybrid pvid vlan 13
[SwitchA-GigabitEthernet0/0/1] port hybrid untagged vlan 13 
[SwitchA-GigabitEthernet0/0/1] quit

# Configure SwitchB.

<HUAWEI> system-view
[HUAWEI] sysname SwitchB
[SwitchB] vlan 13
[SwitchB-vlan13] quit
[SwitchB] interface gigabitethernet 0/0/1
[SwitchB-GigabitEthernet0/0/1] port link-type hybrid
[SwitchB-GigabitEthernet0/0/1] port hybrid pvid vlan 13
[SwitchB-GigabitEthernet0/0/1] port hybrid untagged vlan 13 
[SwitchB-GigabitEthernet0/0/1] quit

Set IP addresses of VLANIF interfaces so that SwitchA can communicate with SwitchB at Layer 3.

# Configure SwitchA.

[SwitchA] interface vlanif13
[SwitchA-Vlanif13] ip address 10.1.1.5 24
[SwitchA-Vlanif13] quit

# Configure SwitchB.

[SwitchB] interface vlanif13
[SwitchB-Vlanif13] ip address 10.1.1.6 24
[SwitchB-Vlanif13] quit

Configure a BFD session supporting the BFD Echo function.

# Configure SwitchA.

[SwitchA] bfd
[SwitchA-bfd] quit
[SwitchA] bfd atob bind peer-ip 10.1.1.6 interface vlanif13 source-ip 10.1.1.5 one-arm-echo
[SwitchA-bfd-session-atob] discriminator local 1
[SwitchA-bfd-session-atob] min-echo-rx-interval 100
[SwitchA-bfd-session-atob] commit
[SwitchA-bfd-session-atob] quit

Verify the configuration.

# When the network runs stably, run the display bfd session all verbose command on SwitchA. You can see that a single-hop BFD session is set up and its status is Up.

[SwitchA] display bfd session all verbose
--------------------------------------------------------------------------------
Session MIndex : 256       (One Hop) State : Up        Name : atob
--------------------------------------------------------------------------------
  Local Discriminator    : 1                Remote Discriminator   : -
  Session Detect Mode    : Asynchronous One-arm-echo Mode
  BFD Bind Type          : Interface(Vlanif13)
  Bind Session Type      : Static
  Bind Peer IP Address   : 10.1.1.6
  NextHop Ip Address     : 10.1.1.6
  Bind Interface         : Vlanif13
  Bind Source IP Address : 10.1.1.5
  FSM Board Id           : 0                TOS-EXP                : 7
  Echo Rx Interval (ms)  : 100
  Actual Tx Interval (ms): 100              Actual Rx Interval (ms): 100
  Local Detect Multi     : 3                Detect Interval (ms)   : 300
  Echo Passive           : Disable          Acl Number             : -
  Destination Port       : 3784             TTL                    : 255
  Proc Interface Status  : Disable          Process PST            : Disable
  WTR Interval (ms)      : -                
  Active Multi           : 3                DSCP                   : - 
  Last Local Diagnostic  : No Diagnostic
  Bind Application       : No Application Bind
  Session TX TmrID       : -                Session Detect TmrID   : -
  Session Init TmrID     : -                Session WTR TmrID      : -
  Session Echo Tx TmrID  : -
  PDT Index              : FSM-0 | RCV-0 | IF-0 | TOKEN-0
  Session Description    : -
--------------------------------------------------------------------------------

     Total UP/DOWN Session Number : 1/0

Configuration Files

SwitchA configuration file

#
sysname SwitchA
#
vlan batch 13
#
bfd
#
interface Vlanif13
 ip address 10.1.1.5 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 13 
 port hybrid untagged vlan 13
#
bfd atob bind peer-ip 10.1.1.6 interface Vlanif13 source-ip 10.1.1.5 one-arm-echo
 discriminator local 1
 min-echo-rx-interval 100
 commit
#
return

SwitchB configuration file

#
sysname SwitchB
#
vlan batch 13
#
interface Vlanif13
 ip address 10.1.1.6 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 13 
 port hybrid untagged vlan 13
#
return