Example for Associating EFM with IPv4 Static Routes

After EFM is associated with IPv4 static routes, the system responds to the interface Up or Down event that is triggered by the change of the EFM OAM extension status and determines whether to activate static routes. This mechanism controls route advertisement and ensures that the traffic from the remote end can be correctly forwarded.

Networking Requirements

In Figure 1, Device A and Device B are connected. EFM OAM is enabled on Device A and Device B. A static route destined for 1.1.1.1/32 is configured on Device A, and this static route is associated with EFM.

Figure 1 Associating EFM with IPv4 static routes

Interfaces 1 and 2 in this example represent GE 0/1/0 and GE 0/1/1, respectively.

Configuration Roadmap

The configuration roadmap is as follows:

Enable EFM OAM both globally and on the interfaces of Device A and Device B.
Configure a static route destined for 1.1.1.1/32 on Device A and associate EFM with this static route.

Data Preparation

To complete the configuration, you need the IP addresses of interfaces.

Procedure

Configure an IP address for each interface. For configuration details, see Configuration Files in this section.

Enable EFM OAM both globally and on the interfaces of Device A and Device B.

# Enable EFM OAM both globally and on the interface of Device A.

<DeviceA> system-view
[~DeviceA] efm enable
[*DeviceA] interface GigabitEthernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] undo shutdown
[*DeviceA-GigabitEthernet0/1/0] efm enable
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit
[~DeviceA] quit

# Enable EFM OAM both globally and on the interface of Device B.

<DeviceB> system-view
[~DeviceB] efm enable
[*DeviceB] interface GigabitEthernet 0/1/0
[*DeviceB-GigabitEthernet0/1/0] undo shutdown
[*DeviceB-GigabitEthernet0/1/0] efm enable
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit
[~DeviceB] quit

# Display EFM OAM session information on Device A.

<DeviceA> display efm session all
  Interface                 EFM State                   Loopback Timeout
  ----------------------------------------------------------------------
  GigabitEthernet0/1/0      detect                      --

The preceding command output shows that the EFM OAM status is detect.

Associating EFM with IPv4 static routes.

# Configure a static route destined for 1.1.1.1/32 on Device A and associate EFM with this static route.

<DeviceA> system-view
[~DeviceA] ip route-static 1.1.1.1 255.255.255.255 GigabitEthernet0/1/1 172.16.1.2 track efm-state GigabitEthernet0/1/0
[*DeviceA] commit
[~DeviceA] quit

Verify the configuration.

# Run the display current-configuration | include efm command on Device A. The following command output shows that the static route has been associated with EFM:

<DeviceA> display current-configuration | include efm
efm enable
ip route-static 1.1.1.1 255.255.255.255 GigabitEthernet0/1/1 172.16.1.2 track efm-state GigabitEthernet0/1/0

# Display the IP routing table on Device A. The following command output shows that the static route destined for 1.1.1.1/32 exists in the IP routing table:

<DeviceA> display ip routing-table
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route
------------------------------------------------------------------------------
Routing Table : _public_
         Destinations : 8        Routes : 8

Destination/Mask    Proto   Pre  Cost        Flags NextHop         Interface

        1.1.1.1/32  Static  60   0             D  172.16.1.2      GigabitEthernet0/1/1
      127.0.0.0/8   Direct  0    0             D  127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0             D  127.0.0.1       InLoopBack0
127.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0
     172.16.1.0/24  Direct  0    0             D  172.16.1.1      GigabitEthernet0/1/1
     172.16.1.1/32  Direct  0    0             D  127.0.0.1       GigabitEthernet0/1/1
   172.16.1.255/32  Direct  0    0             D  127.0.0.1       GigabitEthernet0/1/1
255.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0

# Run the shutdown command on GE 0/1/0 of Device A to check whether the EFM OAM status changes.

<DeviceA> system-view
[~DeviceA] interface GigabitEthernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] shutdown
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit
[~DeviceA] quit

# Run the display efm session all command on Device A. The following command output shows that the EFM OAM status changes to discovery:

<DeviceA> display efm session all
  Interface                 EFM State                   Loopback Timeout
  ----------------------------------------------------------------------
  GigabitEthernet0/1/0      discovery                   --

# Display the IP routing table on Device A. The command output shows that the static route destined for 1.1.1.1/32 does not exist. The static route is unavailable because it has been associated with EFM and the EFM session has not been established.

<DeviceA> display ip routing-table
Route Flags: R - relay, D - download to fib, T - to vpn-instance, B - black hole route
------------------------------------------------------------------------------
Routing Table : _public_
         Destinations : 7        Routes : 7

Destination/Mask    Proto   Pre  Cost        Flags NextHop         Interface

      127.0.0.0/8   Direct  0    0             D  127.0.0.1       InLoopBack0
      127.0.0.1/32  Direct  0    0             D  127.0.0.1       InLoopBack0
127.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0
     172.16.1.0/24  Direct  0    0             D  172.16.1.1      GigabitEthernet0/1/1
     172.16.1.1/32  Direct  0    0             D  127.0.0.1       GigabitEthernet0/1/1
   172.16.1.255/32  Direct  0    0             D  127.0.0.1       GigabitEthernet0/1/1
255.255.255.255/32  Direct  0    0             D  127.0.0.1       InLoopBack0

Configuration Files

Router A configuration file

#
sysname DeviceA
#
efm enable
#
interface GigabitEthernet0/1/0
 undo shutdown
 efm enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 172.16.1.1 255.255.255.0
#
 ip route-static 1.1.1.1 255.255.255.255 GigabitEthernet0/1/1 172.16.1.2 track efm-state GigabitEthernet0/1/0
#
return

Router B configuration file

#
sysname DeviceB
#
efm enable
#
interface GigabitEthernet0/1/0
 undo shutdown
 efm enable
#
interface GigabitEthernet0/1/1
 undo shutdown
 ip address 172.16.1.2 255.255.255.0
#
interface LoopBack0
 ip address 1.1.1.1 255.255.255.255
#
return