Example for Configuring AIS

Networking Requirements

AIS is used to prevent a MEP in an MD of a higher level from sending the same trap as that sent by a MEP in an MD of a lower level to the NMS.

In Figure 1, CE1 is connected to PE1 and CE2 is connected to PE2 through sub-interfaces. A VLAN is created between PEs.

AIS is configured on PEs and alarm suppression is enabled on CEs. In MD nesting scenarios, if a MEP in a low-level MD detects a fault, the MEP sends a trap to the NMS. After a certain period, a MEP in the MD of a higher level also detects the fault and sends the same trap to the NMS. In this case, the MEP in the MD of a higher level must be prevented from sending the same trap to the NMS.

Figure 1 Configuring AIS

Configuration Roadmap

The configuration roadmap is as follows:

Add PEs to an MD, add CEs to an MD, and ensure that the level of the MD to which the PEs belong is lower than that to which CEs belong so that the MEP in the MD of a higher level is suppressed from sending the same trap to the NMS.
Configure alarm suppression to suppress MEPs in MDs of different levels from sending the same trap to the NMS.

Procedure

Configure VLANs.

# Configure PE1.

<HUAWEI> system-view
[HUAWEI] sysname PE1
[PE1] vlan batch 2 10
[PE1] interface gigabitethernet 0/0/1
[PE1-GigabitEthernet0/0/1] port link-type trunk
[PE1-GigabitEthernet0/0/1] port trunk allow-pass vlan 2 10
[PE1-GigabitEthernet0/0/1] quit
[PE1] interface gigabitethernet 0/0/2
[PE1-GigabitEthernet0/0/2] port link-type trunk
[PE1-GigabitEthernet0/0/2] port trunk allow-pass vlan 2 10
[PE1-GigabitEthernet0/0/2] quit

# Configure PE2.

<HUAWEI> system-view
[HUAWEI] sysname PE2
[PE2] vlan batch 2 10
[PE2] interface gigabitethernet 0/0/1
[PE2-GigabitEthernet0/0/1] port link-type trunk
[PE2-GigabitEthernet0/0/1] port trunk allow-pass vlan 2 10
[PE2-GigabitEthernet0/0/1] quit
[PE2] interface gigabitethernet 0/0/2
[PE2-GigabitEthernet0/0/2] port link-type trunk
[PE2-GigabitEthernet0/0/2] port trunk allow-pass vlan 2 10
[PE2-GigabitEthernet0/0/2] quit

# Configure CE1.

<HUAWEI> system-view
[HUAWEI] sysname CE1
[CE1] vlan batch 10
[CE1] interface gigabitethernet 0/0/1
[CE1-GigabitEthernet0/0/1] port link-type trunk
[CE1-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[CE1-GigabitEthernet0/0/1] quit

# Configure CE2.

<HUAWEI> system-view
[HUAWEI] sysname CE2
[CE2] vlan batch 10
[CE2] interface gigabitethernet 0/0/1
[CE2-GigabitEthernet0/0/1] port link-type trunk
[CE2-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[CE2-GigabitEthernet0/0/1] quit

Configure basic Ethernet CFM functions.

Configure basic Ethernet CFM functions on each PE. Specify CFM version as IEEE Standard 802.1ag-2007, create an MD named md1 and an MA named ma1, and bind the MA to the VLAN.

# Configure PE1.

[PE1] cfm version standard [PE1] cfm enable
[PE1] cfm md md1 level 3
[PE1-md-md1] ma ma1
[PE1-md-md1-ma-ma1] map vlan 2
[PE1-md-md1-ma-ma1] quit
[PE1-md-md1] quit

# Configure PE2.

[PE2] cfm version standard
[PE2] cfm enable
[PE2] cfm md md1 level 3
[PE2-md-md1] ma ma1
[PE2-md-md1-ma-ma1] map vlan 2
[PE2-md-md1-ma-ma1] quit
[PE2-md-md1] quit

Configure basic Ethernet CFM functions on each CE. Create an MD named md2 and an MA named ma2, and specify CFM version as IEEE Standard 802.1ag-2007.

# Configure CE1.

[CE1] cfm version standard
[CE1] cfm enable
[CE1] cfm md md2 level 6
[CE1-md-md2] ma ma2
[CE1-md-md2-ma-ma2] map vlan 10
[CE1-md-md2-ma-ma2] quit
[CE1-md-md2] quit

# Configure CE2.

[CE2] cfm version standard
[CE2] cfm enable
[CE2] cfm md md2 level 6
[CE2-md-md2] ma ma2
[CE2-md-md2-ma-ma2] map vlan 10
[CE2-md-md2-ma-ma2] quit
[CE2-md-md2] quit

Create an inward-facing MEP on the CE interface of each PE.

# Configure PE1.

[PE1] cfm md md1
[PE1-md-md1] ma ma1
[PE1-md-md1-ma-ma1] mep mep-id 31 interface gigabitethernet 0/0/1 inward
[PE1-md-md1-ma-ma1] mep ccm-send enable
[PE1-md-md1-ma-ma1] remote-mep mep-id 32
[PE1-md-md1-ma-ma1] remote-mep ccm-receive enable
[PE1-md-md1-ma-ma1] quit
[PE1-md-md1] quit

# Configure PE2.

[PE2] cfm md md1
[PE2-md-md1] ma ma1
[PE2-md-md1-ma-ma1] mep mep-id 32 interface gigabitethernet 0/0/1 inward
[PE2-md-md1-ma-ma1] mep ccm-send enable
[PE2-md-md1-ma-ma1] remote-mep mep-id 31
[PE2-md-md1-ma-ma1] remote-mep ccm-receive enable
[PE2-md-md1-ma-ma1] quit
[PE2-md-md1] quit

Create an outward-facing MEP on each CE.

# Configure CE1.

[CE1] cfm md md2
[CE1-md-md2] ma ma2
[CE1-md-md2-ma-ma2] mep mep-id 61 interface gigabitethernet 0/0/1 outward
[CE1-md-md2-ma-ma2] ccm-interval 10000
[CE1-md-md2-ma-ma2] mep ccm-send enable
[CE1-md-md2-ma-ma2] remote-mep mep-id 62
[CE1-md-md2-ma-ma2] remote-mep ccm-receive enable
[CE1-md-md2-ma-ma2] quit
[CE1-md-md2] quit

# Configure CE2.

[CE2] cfm md md2
[CE2-md-md2] ma ma2
[CE2-md-md2-ma-ma2] mep mep-id 62 interface gigabitethernet 0/0/1 outward
[CE2-md-md2-ma-ma2] ccm-interval 10000
[CE2-md-md2-ma-ma2] mep ccm-send enable
[CE2-md-md2-ma-ma2] remote-mep mep-id 61
[CE2-md-md2-ma-ma2] remote-mep ccm-receive enable
[CE2-md-md2-ma-ma2] quit
[CE2-md-md2] quit

Verify the CFM configuration.

# Run the display cfm remote-mep command on CE1 and PE1. You can view MEP information.

[CE1] display cfm remote-mep
The total number of RMEPs is : 1
The status of RMEPs : 1 up, 0 down, 0 disable
--------------------------------------------------
 MD Name            : md2
 Level              : 6
 MA Name            : ma2
 RMEP ID            : 62
 VLAN ID            : 10
 VSI Name           : --
 L2VC ID            : --
 MAC                : 00e0-0003-0003
 CCM Receive        : enabled
 Trigger-If-Down    : disabled
 CFM Status         : up
 Alarm Status       : none
 Interface TLV      : --
 Connect Status     : up

[PE1] display cfm remote-mep
The total number of RMEPs is : 1
The status of RMEPs : 1 up, 0 down, 0 disable
--------------------------------------------------
 MD Name            : md1
 Level              : 3
 MA Name            : ma1
 RMEP ID            : 32
 VLAN ID            : 2
 VSI Name           : --
 L2VC ID            : --
 MAC                : 0044-0141-5410
 CCM Receive        : enabled
 Trigger-If-Down    : disabled
 CFM Status         : up
 Alarm Status       : none
 Interface TLV      : --
 Connect Status     : up

Configure AIS.

# Configure PE1.

[PE1] cfm md md1
[PE1-md-md1] ma ma1
[PE1-md-md1-ma-ma1] ais enable
[PE1-md-md1-ma-ma1] ais link-status interface gigabitethernet 0/0/2
[PE1-md-md1-ma-ma1] ais level 6
[PE1-md-md1-ma-ma1] ais interval 1
[PE1-md-md1-ma-ma1] ais vlan vid 10 mep 31
[PE1-md-md1-ma-ma1] quit
[PE1-md-md1] quit

# Configure PE2.

[PE2] cfm md md1
[PE2-md-md1] ma ma1
[PE2-md-md1-ma-ma1] ais enable
[PE2-md-md1-ma-ma1] ais link-status interface gigabitethernet 0/0/2
[PE2-md-md1-ma-ma1] ais level 6
[PE2-md-md1-ma-ma1] ais interval 1
[PE2-md-md1-ma-ma1] ais vlan vid 10 mep 32
[PE2-md-md1-ma-ma1] quit
[PE2-md-md1] quit

Enable alarm suppression.

# Configure CE1.

[CE1] cfm md md2
[CE1-md-md2] ma ma2
[CE1-md-md2-ma-ma2] ais enable
[CE1-md-md2-ma-ma2] ais suppress-alarm
[CE1-md-md2-ma-ma2] quit
[CE1-md-md2] quit

# Configure CE2.

[CE2] cfm md md2
[CE2-md-md2] ma ma2
[CE2-md-md2-ma-ma2] ais enable
[CE2-md-md2-ma-ma2] ais suppress-alarm
[CE2-md-md2-ma-ma2] quit
[CE2-md-md2] quit

Verify the configuration.

# After association functions are configured, run the shutdown command on GE0/0/2 of PE1 to simulate a fault occurs in the VLAN between PE1 and PE2.

[PE1] interface gigabitethernet 0/0/2
[PE1-GigabitEthernet0/0/2] shutdown
[PE1-GigabitEthernet0/0/2] quit

# Run the display cfm ma md md1 ma ma1 command on PE1. The value of the Sending Ais Packet field is displayed as Yes in the command output. Run the display cfm ma md md2 ma ma2 command on CE1. The value of the Suppressing Alarms field is displayed as Yes in the command output.

[PE1] display cfm ma md md1 ma ma1
  MD Name            : md1
  MD Name Format     : string
  Level              : 3
  MIP Create-type    : none
  SenderID TLV-type  : defer
  MA Name            : ma1
  MA Name Format     : string
  Interval           : 1000
  Priority           : 7
  VLAN ID            : 2
  VSI Name           : --
  L2VC ID            : --
  MEP Number         : 1
  RMEP Number        : 1
  Suppressing Alarms : No
  Sending AIS Packet : Yes
  Interface TLV      : disabled    RDI Track-action   : all-enabled

[CE1] display cfm ma md md2 ma ma2
  MD Name            : md2
  MD Name Format     : string
  Level              : 6
  MIP Create-type    : none
  SenderID TLV-type  : defer
  MA Name            : ma2
  MA Name Format     : string
  Interval           : 10000
  Priority           : 7
  VLAN ID            : 10
  VSI Name           : --
  L2VC ID            : --
  MEP Number         : 1
  RMEP Number        : 1
  Suppressing Alarms : Yes
  Sending AIS Packet : No
  Interface TLV      : disabled    RDI Track-action   : all-enabled

Configuration Files

PE1 configuration file

#
sysname PE1
#
vlan batch 2 10
#
cfm enable
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 2 10
#
cfm md md1 level 3
 ma ma1
  map vlan 2
  mep mep-id 31 interface GigabitEthernet0/0/1 inward
  mep ccm-send mep-id 31 enable
  remote-mep mep-id 32
  remote-mep ccm-receive mep-id 32 enable
  ais enable
  ais level 6
  ais vlan vid 10 mep 31
  ais link-status interface GigabitEthernet0/0/2
#
return

PE2 configuration file

#
sysname PE2
#
vlan batch 2 10
#
cfm enable
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 2 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 2 10
#
cfm md md1 level 3
 ma ma1
  map vlan 2
  mep mep-id 32 interface GigabitEthernet0/0/1 inward
  mep ccm-send mep-id 32 enable
  remote-mep mep-id 31
  remote-mep ccm-receive mep-id 31 enable
  ais enable
  ais level 6
  ais vlan vid 10 mep 32
  ais link-status interface GigabitEthernet0/0/2
#
return

CE1 configuration file

#
sysname CE1
#
vlan batch 10
#
cfm enable
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
cfm md md2 level 6
 ma ma2
  map vlan 10
  ccm-interval 10000
  mep mep-id 61 interface GigabitEthernet0/0/1 outward
  mep ccm-send mep-id 61 enable
  remote-mep mep-id 62
  remote-mep ccm-receive mep-id 62 enable
  ais enable
  ais suppress-alarm
#
return

CE2 configuration file

#
sysname CE2
#
vlan batch 10
#
cfm enable
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
cfm md md2 level 6
 ma ma2
  map vlan 10
  ccm-interval 10000
  mep mep-id 62 interface GigabitEthernet0/0/1 outward
  mep ccm-send mep-id 62 enable
  remote-mep mep-id 61
  remote-mep ccm-receive mep-id 61 enable
  ais enable
  ais suppress-alarm
#
return