Example for Configuring Single-Hop BFD for a Layer 3 Eth-Trunk
This section provides an example for establishing single-hop BFD sessions on Eth-Trunk interfaces to monitor the directly connected link between the Eth-Trunk interfaces.
Networking Requirements
Eth-Trunks enhance link reliability. BFD sessions are established to rapidly monitor Eth-Trunks. As shown in Figure 1, the Eth-Trunk connecting Device A and Device B consists of two GE links.
This example requires BFD to be performed over the Eth-Trunk.
Precautions
BFD sessions must be established on the Eth-Trunk interface of both the local and remote devices.
Configuration Roadmap
The configuration roadmap is as follows:
Create an Eth-Trunk interface on both the local and remote devices.
Configure single-hop BFD for the Eth-Trunk.
Data Preparation
To complete the configuration, you need the following data:
Local Eth-Trunk interface that sends and receives BFD control packets
Peer IP address monitored by BFD (the IP address of the Eth-Trunk interface)
Names of the BFD sessions for monitoring the Eth-Trunk
Local and remote discriminators of BFD sessions
Procedure
- Configure an Eth-Trunk interface.
# Create an Eth-Trunk interface on Device A and set the lower threshold of the Eth-Trunk in the Up state to 1.
<HUAWEI> system-view [~HUAWEI] sysname DeviceA [*HUAWEI] commit [~DeviceA] interface eth-trunk 1 [*DeviceA-Eth-Trunk1] undo shutdown [*DeviceA-Eth-Trunk1] ip address 10.1.1.1 24 [*DeviceA-Eth-Trunk1] least active-linknumber 1 [*DeviceA-Eth-Trunk1] commit [~DeviceA-Eth-Trunk1] quit [~DeviceA] interface gigabitethernet 0/1/0 [~DeviceA-Gigabitethernet0/1/0] undo shutdown [*DeviceA-Gigabitethernet0/1/0] eth-trunk 1 [*DeviceA-Gigabitethernet0/1/0] commit [~DeviceA-Gigabitethernet0/1/0] quit [~DeviceA] interface gigabitethernet 0/1/8 [~DeviceA-Gigabitethernet0/1/8] undo shutdown [*DeviceA-Gigabitethernet0/1/8] eth-trunk 1 [*DeviceA-Gigabitethernet0/1/8] commit [~DeviceA-Gigabitethernet0/1/8] quit
# Create an Eth-Trunk interface on Device B and set the lower threshold of the Eth-Trunk in the Up state to 1.
<HUAWEI> system-view [~HUAWEI] sysname DeviceB [*HUAWEI] commit [~DeviceB] interface eth-trunk 1 [*DeviceB-Eth-Trunk1] undo shutdown [*DeviceB-Eth-Trunk1] ip address 10.1.1.2 24 [*DeviceB-Eth-Trunk1] least active-linknumber 1 [*DeviceB-Eth-Trunk1] commit [~DeviceB-Eth-Trunk1] quit [~DeviceB] interface gigabitethernet 0/1/0 [~DeviceB-Gigabitethernet0/1/0] undo shutdown [*DeviceB-Gigabitethernet0/1/0] eth-trunk 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] eth-trunk 1 [*DeviceB-Gigabitethernet0/1/8] commit [~DeviceB-Gigabitethernet0/1/8] quit
After completing the configurations, run the display interface eth-trunk command on Device A or Device B. The command output shows that the interface status is Up.
The following example uses the command output on Device A.
[~DeviceA] display interface eth-trunk 1 Eth-Trunk1 current state : UP (ifindex: 19) Line protocol current state : UP Last line protocol up time : 2015-08-04 08:34:41 Link quality grade : GOOD Description: Route Port,Hash arithmetic : According to flow,Maximal BW: 100M, Current BW: 100 M, The Maximum Transmit Unit is 1500 Internet Address is 10.1.1.1/24 IP Sending Frames' Format is ***, Hardware address is xxxx-xxxx-xxxx Current system time: 2010-08-04 08:35:02 Physical is ETH_TRUNK Last 300 seconds input rate 0 bits/sec, 0 packets/sec Last 300 seconds output rate 0 bits/sec, 0 packets/sec Input: 0 packets,0 bytes 0 unicast,0 broadcast,0 multicast 0 errors,0 drops Output:0 packets,0 bytes 0 unicast,0 broadcast,0 multicast 0 errors,0 drops Last 300 seconds input utility rate: 0.00% Last 300 seconds output utility rate: 0.00% ----------------------------------------------------- PortName Status Weight ----------------------------------------------------- Gigabitethernet0/1/0 UP 1 Gigabitethernet0/2/0 UP 1 ----------------------------------------------------- The Number of Ports in Trunk : 2 The Number of UP Ports in Trunk : 2
The Eth-Trunk interfaces on Device A and Device B can ping each other.
The following example uses the command output on Device A.
[~DeviceA] ping -a 10.1.1.1 10.1.1.2 PING 10.1.1.2: 56 data bytes, press CTRL_C to break Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=255 time=31 ms Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=31 ms Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=62 ms Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=62 ms Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=62 ms --- 10.1.1.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 31/49/62 ms
- Configure single-hop BFD for the Eth-Trunk.
# Enable BFD on Device A and establish a BFD session to monitor the link from Device A to Device B. Bind the BFD session to the Eth-Trunk interface.
[~DeviceA] bfd [*DeviceA-bfd] quit [*DeviceA] bfd atob bind peer-ip 10.1.1.2 interface eth-trunk 1 [*DeviceA-bfd-session-atob] discriminator local 10 [*DeviceA-bfd-session-atob] discriminator remote 20 [*DeviceA-bfd-session-atob] commit [~DeviceA-bfd-session-atob] quit
# Enable BFD on Device B and establish a BFD session to monitor the link from Device B to Device A. Bind the BFD session to the Eth-Trunk interface.
[~DeviceB] bfd [*DeviceB-bfd] quit [*DeviceB] bfd btoa bind peer-ip 10.1.1.1 interface eth-trunk 1 [*DeviceB-bfd-session-btoa] discriminator local 20 [*DeviceB-bfd-session-btoa] discriminator remote 10 [*DeviceB-bfd-session-btoa] commit [~DeviceB-bfd-session-btoa] quit
- Verify the configuration.
After completing the configurations, run the display bfd session all verbose command on Device A and Device B. The command output shows that a single-hop BFD session 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 : atob ------------------------------------------------------------------------------ Local Discriminator : 10 Remote Discriminator : 20 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Eth-Trunk1) Bind Session Type : Static Bind Peer IP Address : 10.1.1.2 Bind Interface : Eth-Trunk1 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 : 2584985432 Session Detect TmrID : - Session Init TmrID : - Session WTR TmrID : - Session Echo Tx TmrID : - Session Description : - ------------------------------------------------------------------------------ Total UP/DOWN Session Number : 1/0
# Run the shutdown command on GE 0/1/0 of Device A to simulate a link fault.
[~DeviceA] interface gigabitethernet 0/1/0 [~DeviceA-Gigabitethernet0/1/0] shutdown [*DeviceA-Gigabitethernet0/1/0] commit [~DeviceA-Gigabitethernet0/1/0] quit
Run the display bfd session all verbose and display interface eth-trunk commands on Device A and Device B. The command output shows that the statuses of the BFD session and Eth-Trunk interface are still 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 : atob ------------------------------------------------------------------------------ Local Discriminator : 10 Remote Discriminator : 20 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Eth-Trunk1) Bind Session Type : Static Bind Peer IP Address : 10.1.1.2 Bind Interface : Eth-Trunk1 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 : Control Detection Time Expired Bind Application : No Application Bind Session TX TmrID : 2584985432 Session Detect TmrID : - Session Init TmrID : - Session WTR TmrID : - Session Echo Tx TmrID : - Session Description : - ------------------------------------------------------------------------------ Total UP/DOWN Session Number : 1/0 [~DeviceA] display interface eth-trunk 1 Eth-Trunk1 current state : UP Line protocol current state : UP Description : HUAWEI, Eth-Trunk1 Interface, Route Port Hash arithmetic : According to flow,Maximal BW: 200M, Current BW: 0M The Maximum Transmit Unit is 1500 bytes Internet Address is 10.1.1.1/24 IP Sending Frames' Format is ***, Hardware address is xxxx-xxxx-xxxx Physical is ETH_TRUNK Last 300 seconds input rate 0 bits/sec, 0 packets/sec Last 300 seconds output rate 0 bits/sec, 0 packets/sec Realtime 0 seconds input rate 0 bits/sec, 0 packets/sec Realtime 0 seconds output rate 0 bits/sec, 0 packets/sec Input: 0 packets,0 bytes, 0 unicast,0 broadcast,0 multicast 0 errors,0 drops,0 unknownprotocol Output:0 packets,0 bytes, 0 unicast,0 broadcast,0 multicast 0 errors,0 drops ----------------------------------------------------- PortName Status Weight ----------------------------------------------------- Gigabitethernet0/1/0 DOWN 1 Gigabitethernet0/1/8 UP 1 ----------------------------------------------------- The Number of Ports in Trunk : 2 The Number of UP Ports in Trunk : 1
Run the shutdown command on GE 0/1/8 of Device A to simulate a link fault.
[~DeviceA] interface gigabitethernet 0/1/8 [~DeviceA-Gigabitethernet0/1/8] shutdown [*DeviceA-Gigabitethernet0/1/8] commit [~DeviceA-Gigabitethernet0/1/8] quit
Run the display bfd session all verbose and display interface eth-trunk commands on Device A and Device B. The command output shows that the statuses of the BFD session and Eth-Trunk interface are both Down.
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 : Down Name : atob ------------------------------------------------------------------------------ Local Discriminator : 10 Remote Discriminator : 20 Session Detect Mode : Asynchronous Mode Without Echo Function BFD Bind Type : Interface(Eth-Trunk1) Bind Session Type : Static Bind Peer IP Address : 10.1.1.2 Bind Interface : Eth-Trunk1 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 : 2584985432 Session Detect TmrID : - Session Init TmrID : - Session WTR TmrID : - Session Echo Tx TmrID : - Session Description : - ------------------------------------------------------------------------------ Total UP/DOWN Session Number : 0/1 [~DeviceA] display interface eth-trunk 1 Eth-Trunk1 current state : DOWN Line protocol current state : DOWN Description : HUAWEI, Eth-Trunk1 Interface, Route Port Hash arithmetic : According to flow,Maximal BW: 200M, Current BW: 0M The Maximum Transmit Unit is 1500 bytes Internet Address is 10.1.1.1/24 IP Sending Frames' Format is ***, Hardware address is xxxx-xxxx-xxxx Physical is ETH_TRUNK Last 300 seconds input rate 0 bits/sec, 0 packets/sec Last 300 seconds output rate 0 bits/sec, 0 packets/sec Realtime 0 seconds input rate 0 bits/sec, 0 packets/sec Realtime 0 seconds output rate 0 bits/sec, 0 packets/sec Input: 0 packets,0 bytes, 0 unicast,0 broadcast,0 multicast 0 errors,0 drops,0 unknownprotocol Output:0 packets,0 bytes, 0 unicast,0 broadcast,0 multicast 0 errors,0 drops ----------------------------------------------------- PortName Status Weight ----------------------------------------------------- Gigabitethernet0/1/0 DOWN 1 Gigabitethernet0/1/8 DOWN 1 ----------------------------------------------------- The Number of Ports in Trunk : 2 The Number of UP Ports in Trunk : 0
Configuration Files
Device A configuration file
# sysname DeviceA # bfd # interface Eth-Trunk1 ip address 10.1.1.1 255.255.255.0 # interface Gigabitethernet0/1/0 undo shutdown eth-trunk 1 # interface Gigabitethernet0/1/8 undo shutdown eth-trunk 1 # bfd atob bind peer-ip 10.1.1.2 interface Eth-Trunk 1 discriminator local 10 discriminator remote 20 return
Device B configuration file
# sysname DeviceB # bfd # interface Eth-Trunk1 ip address 10.1.1.2 255.255.255.0 # interface Gigabitethernet0/1/0 undo shutdown eth-trunk 1 # interface Gigabitethernet0/1/8 undo shutdown eth-trunk 1 # bfd btoa bind peer-ip 10.1.1.1 interface Eth-Trunk 1 discriminator local 20 discriminator remote 10 return