Monday, January 2, 2017

The Ethernet OAM Configuration on cfm mep(distributing-mode)

Function

The cfm mep command is used to create a maintenance end point (MEP). An MEP is an end point of the maintenance telecommunications channel. Ethernet operation, administration, and maintenance (OAM) relies on MEPs at the two ends of a channel to detect the connectivity of the channel. So, the MEP must be created.After this command is successfully executed, the created MEP is used to detect the connectivity of channels within a subnet (MA).
The undo cfm mep command is used to delete an MEP. To delete an MEP that is not needed, run this command. After an MEP is deleted, the MEP is not available.

Format

cfm mep mdindex/maindex/mepid direction { up | down } { link-aggregation | protect-group | port } frameid/slotid/portid [ gemportid gemportid ] { [ vlantag1 vlantag1-value [ vlantag2 vlantag2-value ] ] | [ priority priority-value ] | [ trigger if-notify ] | [ lowest-alarm-pri lowest-alarm-pri-value ] } *
cfm mep mdindex/maindex/mepid direction down l2vpn [ priority priority-value | lowest-alarm-pri lowest-alarm-pri-value ] *
cfm mep mdindex/maindex/mepid direction { up | down } port frameid/slotid/portid vpi vpi vci vci { [ vlantag1 vlantag1-value [ vlantag2 vlantag2-value ] ] | [ priority priority-value ] | [ lowest-alarm-pri lowest-alarm-pri-value ] } *
cfm mep mdindex/maindex/mepid direction { up | down } { port | link-aggregation | protect-group } frameid/slotid/portid { { [ vlantag1 vlantag1-value [ vlantag2 vlantag2-value ] ] } | [ priority priority-value ] | [ trigger { if-notify | if-down [ trigger-pri ] } ] | [ lowest-alarm-pri lowest-alarm-pri-value ] }*
undo cfm mep mdindex/maindex/mepid

Parameters

Parameter Description Value
mdindex/maindex/mepid
Indicates the index value of an MEP.
  • mdindex: indicates the index of an MD. You can run the cfm md command to create an MD.
  • maindex: indicates the index of an MA. You can run the cfm ma command to create an MA.
  • mepindex: indicates the ID of an MEP. You can run the cfm mep(profile-mode) command to create an MA.
 Character string type. Range:
  • mdindex: 0-7.
  • maindex: 0-4095.
  • mepid: 1-8191.
direction
Indicates the administrative direction of an MEP. Two directions are supported: up and down.
  • An UP MEP indicates that the MEP transmits packets to the bridge trunk direction.
  • A DOWN MEP indicates that the MEP transmits packets to the physical medium direction.
When a device port is defined as an MEP, it must be defined as the UP MEP or the DOWN MEP. In addition, it can be defined as only either the UP MEP or the DOWN MEP. That is, when a device port is defined as an MEP, it can transmit packets to only one direction.
For example, after the GIU upstream port on the MA5680T/MA5683T/MA5608T is defined as an MEP, it is a DOWN MEP if it can transmit packets to only the upstream direction (convergence layer) according to the definition; it is an UP MEP if it can transmit packets to only the downstream direction (to hardware and logic) according to the definition.		 -
up Indicates that the administrative direction of an MEP is up. -
down Indicates that the administrative direction of an MEP is down. -
link-aggregation frameid/slotid/portid Indicates the subrack ID, slot ID, and link-aggregation port ID. Enter a slash (/) between the subrack, slot, and port IDs. Please see Differences Between Shelves.
protect-group frameid/slotid/portid Indicates the subrack ID, slot ID, and protection group master port ID. Enter a slash (/) between the subrack, slot, and port IDs. Please see Differences Between Shelves.
port frameid/slotid/portid Indicates the subrack ID, slot ID, and port ID. Enter a slash (/) between the subrack, slot, and port IDs. Please see Differences Between Shelves.
l2vpn Indicates the MPLS Layer 2 virtual channel. -
priority priority Indicates the priorities of continuity check messages (CCMs) and link trace messages (LTMs). The larger the value, the higher the priority. Numeral type. Range: 0-7.
Default: 7.
gemportid gemportid Indicates the GEM port ID. To create the MEP for a GEM port, use this parameter. Numeral type. Range: 128-3999.
vpi vpi Indicates the VPI value to be entered. It is used to identify a user when used with the VCI.
Numeral type. Range:
  • xDSL board. Range: 0-255.
  • Other boards. Range: 0-4095.
vci vci Indicates the VCI value to be entered. It is used to identify a user when used with the VPI.
  • Numeral type. xDSL board. Range: 32-255.
  • Numeral type. Other boards. Range: 32-65535.
vlantag1 vlantag1-value Indicates VLAN tag 1, representing an outer VLAN receiving or sending packets. Numeral type. Range: 1-4095.
vlantag2 vlantag2-value Indicates VLAN tag 2, representing an inner VLAN receiving or sending packets. Numeral type. Range: 1-4095.
trigger if-notify Indicates whether the associated protection switching of the MEP is enabled. When it is enabled, the system performs a protection switching when a line fails.
By default, the associated protection switching is disabled.		 -
trigger if-down Indicates that the MEP CC alarm status is associated with the status of the port on which the MEP is configured. When the association is enabled, the system determines whether to activate/deactivate the port based on the current MEP alarm status.
By default, the association is disabled.		 -
trigger-pri Indicates the lowest CC alarm priority at which the "trigger if-down" association is triggered. When the alarm priority of the MEP is equal to or higher than the preset association level, the system deactivates the MEP port; otherwise, the system activates the MEP port. Numeral type. Range: 2-5.
Default value: 2.
lowest-alarm-pri lowest-alarm-pri-value Indicates the lowest alarm priority of the MEP. When the alarm priority of the MEP is lower than the preset lowest alarm priority, no alarm will be reported. Otherwise, an alarm is reported. Numeral type. Range: 1-6.
Default value: 2.

Modes

Global config mode

Level

Operator level

Usage Guidelines

  • Currently, an MA supports only 1 local MEP and 8 remote MEPs.
  • Currently, the ports on the MA5600T/MA5603T/MA5608T can serve as either MEPs or MIPs.
  • An MEP of a non-existing MD or MA cannot be created.
  • An existing MEP cannot be created.
  • For the ETHA, ETHB, or OPGD board, creating an MEP on an inter-board aggregation group is not supported.
  • To delete an MEP, you need to specify the index of the MEP to be deleted.
  • There is only one MEP of management of up direction in the same VLAN.
  • Only one associated protection switching can be enabled for the MEPs on one port or in one VLAN.
  • Currently, the associated protection function is not supported.
  • You can run the cfm mep lowest-alarm-pri command to change the lowest alarm priority of the MEP.
  • When a MEP in the UP direction exists on the service port, the Ethernet OAM service can be in the normal state only when the VLAN configured on the MEP is the same as the user-side VLAN of the traffic stream.
  • When an LB or LT is being tested under an MEP, the MEP cannot be deleted.
  • You can run the cfm ma cc-interval command to set the interval for sending CCM packets and run the display cfm ma command to query the interval for sending CCM packets. The number of MEPs supported by the MA5680T/MA5683T/MA5608T is related to the interval for sending CCM packets. Their relationship is as follows.
    Interval for Sending CCM Packets Number of Supported Local MEPs Number of Supported Remote MEPs
    Shorter than 1s (including 3.3ms, 10ms, and 100ms) 512 512
    1s 16 16
    10s 128 128
    1 minute 512 512
    10 minutes 4096 4096
    NOTE:
    When the intervals for sending CCM packets of several MAs on the MA5680T/MA5683T/MA5608T are different, the minimum number of supported MEPs prevails.

Example

To create an MEP with the following attributes on port 0/19/0, do as follows:
  • Index: 0/0/1
  • Direction: up
  • Port: link-aggregation
  • VLAN tag 1: 10
  • VLAN tag 2: 100
  • Priority: 5
  • Lowest alarm priority: 3
huawei(config)#cfm mep
{ mdindex/maindex/mepid<S><Length 5-11> }:0/0/1
{ ais<K>|cc<K>|direction<K>|disable<K>|enable<K>|fng-alarm-time<K>|fng-reset-tim
e<K>|lowest-alarm-pri<K>|priority<K>|trigger<K> }:direction
{ down<K>|up<K> }:up
{ link-aggregation<K>|port<K>|protect-group<K> }:link-aggregation
{ frameid/slotid/portid<S><Length 5-18> }:0/19/0
{ <cr>|gemportid<K>|lowest-alarm-pri<K>|priority<K>|trigger<K>|vlantag1<K> }:vlantag
1
{ vlantag1<U><1,4095> }:10
{ <cr>|lowest-alarm-pri<K>|priority<K>|trigger<K>|vlantag2<K> }:vlantag2
{ vlantag2<U><1,4095> }:100
{ <cr>|lowest-alarm-pri<K>|priority<K>|trigger<K> }:priority
{ priority<U><0,7> }:5
{ <cr>|lowest-alarm-pri<K>|trigger<K> }:lowest-alarm-pri
{ lowest-alarm-pri-value<U><1,6> }:3
{ <cr>|trigger<K> }:

  Command:
          cfm mep 0/0/1 direction up link-aggregation 0/19/0 vlantag1 10 vlantag2 
100 priority 5 lowest-alarm-pri 3
To delete the MEP with the index of 0/0/1, do as follows:
huawei(config)#undo cfm mep
{ mdindex/maindex/mepid<S><Length 5-11> }:0/0/1
{ <cr>|trigger<K> }:

  Command:
          undo cfm mep 0/0/1

System Response

  • The system does not display any message after the command is executed successfully.

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