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Example for Configuring the BFD Echo Function
Networking Requirements
As shown in Figure 2-26, 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.
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 GE1/0/1 interfaces as hybrid interfaces and add the interfaces to VLANs.
# Configure SwitchA.
<Quidway> system-view [Quidway] sysname SwitchA [SwitchA] vlan 13 [SwitchA-vlan13] quit [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] port hybrid pvid vlan 13 [SwitchA-GigabitEthernet1/0/1] port hybrid untagged vlan 13 [SwitchA-GigabitEthernet1/0/1] quit
# Configure SwitchB.
<Quidway> system-view [Quidway] sysname SwitchB [SwitchB] vlan 13 [SwitchB-vlan13] quit [SwitchB] interface gigabitethernet 1/0/1 [SwitchB-GigabitEthernet1/0/1] port hybrid pvid vlan 13 [SwitchB-GigabitEthernet1/0/1] port hybrid untagged vlan 13 [SwitchB-GigabitEthernet1/0/1] 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 GigabitEthernet1/0/1 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 GigabitEthernet1/0/1 port hybrid pvid vlan 13 port hybrid untagged vlan 13 # return