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Example for Configuring Single-Hop BFD on a VLANIF Interface
Networking Requirements
As shown in Figure 2-21, SwitchA connects to SwitchB through the VLANIF interface. Faults on the link between SwitchA and SwitchB need to be fast detected.
Configuration Roadmap
The configuration roadmap is as follows:
Configure BFD sessions on SwitchA and SwitchB.
Procedure
- Configure devices to ensure network connectivity.
# Assign an IP address to each interface. SwitchA is used as an example. The configuration of SwitchB is similar to the configuration of SwitchA, and is not mentioned here.
<Quidway> system-view [Quidway] sysname SwitchA [SwitchA] vlan batch 100 [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] port hybrid pvid vlan 100 [SwitchA-GigabitEthernet1/0/1] port hybrid untagged vlan 100 [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface vlanif 100 [SwitchA-Vlanif100] ip address 10.1.1.5 24 [SwitchA-Vlanif100] quit
- Configure single-hop BFD.
# Enable BFD and create a BFD session on SwitchA.
[SwitchA] bfd [SwitchA-bfd] quit [SwitchA] bfd atob bind peer-ip 10.1.1.6 interface vlanif 100 [SwitchA-bfd-session-atob] discriminator local 1 [SwitchA-bfd-session-atob] discriminator remote 2 [SwitchA-bfd-session-atob] commit [SwitchA-bfd-session-atob] quit
# Enable BFD and create a BFD session on SwitchB.
[SwitchB] bfd [SwitchB-bfd] quit [SwitchB] bfd btoa bind peer-ip 10.1.1.5 interface vlanif 100 [SwitchB-bfd-session-btoa] discriminator local 2 [SwitchB-bfd-session-btoa] discriminator remote 1 [SwitchB-bfd-session-btoa] commit [SwitchB-bfd-session-btoa] quit
- Verify the configuration.
# When the network runs stably, run the display bfd session all verbose command on SwitchA and SwitchB. You can see that a single-hop BFD session is set up and its status is Up. The command output on SwitchA is used as an example.
[SwitchA] display bfd session all verbose -------------------------------------------------------------------------------- Session MIndex : 4097 (One Hop) State : Up Name : atob -------------------------------------------------------------------------------- Local Discriminator : 1 Remote Discriminator : 2 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Vlanif100) Bind Session Type : Static Bind Peer IP Address : 10.1.1.6 NextHop Ip Address : 10.1.1.6 Bind Interface : Vlanif100 FSM Board Id : 0 TOS-EXP : 7 Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000 Actual Tx Interval (ms): 1000 Actual Rx Interval (ms): 1000 Local Detect Multi : 3 Detect Interval (ms) : 3000 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
# Run the shutdown command on the GE1/0/1 interface of SwitchA to simulate a link fault.
[SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] shutdown [SwitchA-GigabitEthernet1/0/1] quit
# After the configuration is completed, run the display bfd session all verbose command on SwitchA and SwitchB. You can see that a single-hop BFD session is set up and its status is Down. The command output on SwitchA is used as an example.
[SwitchA] display bfd session all verbose -------------------------------------------------------------------------------- Session MIndex : 4097 (One Hop) State : Down Name : atob -------------------------------------------------------------------------------- Local Discriminator : 1 Remote Discriminator : 2 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Vlanif100) Bind Session Type : Static Bind Peer IP Address : 10.1.1.6 NextHop Ip Address : 10.1.1.6 Bind Interface : Vlanif100 FSM Board Id : 0 TOS-EXP : 7 Min Tx Interval (ms) : 1000 Min Rx Interval (ms) : 1000 Actual Tx Interval (ms): 13000 Actual Rx Interval (ms): 13000 Local Detect Multi : 3 Detect Interval (ms) : - 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 : Control Detection Time Expired Bind Application : No Application Bind Session TX TmrID : 16897 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 : 0/1
Configuration Files
SwitchA configuration file
# sysname SwitchA # vlan batch 100 # bfd # interface Vlanif100 ip address 10.1.1.5 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # bfd atob bind peer-ip 10.1.1.6 interface Vlanif100 discriminator local 1 discriminator remote 2 commit # return
SwitchB configuration file
# sysname SwitchB # vlan batch 100 # bfd # interface Vlanif100 ip address 10.1.1.6 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # bfd btoa bind peer-ip 10.1.1.5 interface Vlanif100 discriminator local 2 discriminator remote 1 commit # return