Modifying an IMA GroupResetting an IMA Group

In this interface, you can query and set parameters of the IMA group.

Navigation Path

In the NE Explorer, select an NE and choose Configuration > Interface Management > ATM IMA Management from the Function Tree. Then, click the IMA Group Management tab.

Guideline

You can enable or disable the IMA Protocol Statusof the IMA group only after configuring the bound path of the corresponding VCTRUNK of the IMA group.
If the IMA protocol is enabled, only Min. Active Transmission Links, Min. Active Receiving Links and Maximum Delay Between Links(ms)can be set.
You can modify the IMA Protocol Version, IMA Transmit Frame Length and IMA Symmetry Mode only after you disable the IMA Protocol Enable Status.

Buttons

Button	Description
Reset	In the case of deployment and troubleshooting, can reset an IMA group to re-enable the IMA group protocol. Select the IMA group. Click Reset. A dialog box is displayed, indicating that the operation succeeds. Click Close. NOTE: You must complete the creation of the IMA group.
Apply	When attributes of an IMA group displayed are not consistent with those in the network, modify attributes of this IMA group. Select the IMA group. Modify related attributes of the IMA group. Click Apply. A dialog box is displayed, indicating that the operation succeeds. Click Close. NOTE: NOTICE: If any service is configured and activated at the ATM Trunk port for the IMA group, modification of the IMA group may interrupt services. Exercise caution for this.

Button

Description

Reset

In the case of deployment and troubleshooting, can reset an IMA group to re-enable the IMA group protocol.

Select the IMA group. Click Reset. A dialog box is displayed, indicating that the operation succeeds. Click Close.

NOTE:

You must complete the creation of the IMA group.

Apply

When attributes of an IMA group displayed are not consistent with those in the network, modify attributes of this IMA group.

Select the IMA group. Modify related attributes of the IMA group. Click Apply. A dialog box is displayed, indicating that the operation succeeds. Click Close.

NOTE:

NOTICE:

If any service is configured and activated at the ATM Trunk port for the IMA group, modification of the IMA group may interrupt services. Exercise caution for this.

Parameters

**Table 1** Descriptions of the parameters for IMA Group Management
Field	Value	Description
VCTRUNK	Slot number-Board name-Sub-slot number-Sub-board name-Sub-board port number (Trunk number-Port name)	Displays the VCTRUNK.
IMA Protocol Status	Enabled, Disabled	Enables or disables the IMA protocol. Determines whether to enable the IMA protocol on a VCTRUNK port. Enabled: indicates that the IMA protocol runs on the members bound to a VCTRUNK. Disabled: indicates that the IMA protocol does not run the members bound to a VCTRUNK. In this case, the VCTRUNK is a TC channel. When only one VCTRUNK member exists on the UNI side, users can disable the IMA protocol to configure the VCTRUNK member as a TC channel. When multiple VCTRUNK members exist on the UNI side, users need to enable the IMA protocol to configure the VCTRUNK members as an IMA group. In the case of PE equipment, the UNI-side VCTRUNK type is independent of the ATM connection type. That is, when the VCTRUNK type is a TC channel or an IMA group, the NNI-ATM connection type can be configured as PVP/PVC/Port Transparent.
Min. Active Transmission Links	1 to 32	Sets the minimum transmitting link number that each IMA group needs to configure. The IMA can be activated only when the number of the active links in the group reach the minimum link number. The rules for setting this parameter are as follows: When IMA Symmetry Mode is set to the Symmetrical Mode and Symmetrical Operation, Minimum Number of Active Transmitting Links and Minimum Number of Active Receiving Links must be set to the same value. The value of Minimum Number of Active Transmitting Links must be smaller than or equal to the actual number of IMA members. This parameter must be set to the same value at the two ends of an IMA group.
Min. Active Receiving Links	1 to 32	Sets the minimum receiving link number that each IMA group needs to configure. The IMA can be activated only when the number of the active links in the group reaches the minimum link number. The rules for setting this parameter are as follows: When IMA Symmetry Mode is set to the Symmetrical Mode and Symmetrical Operation, Minimum Number of Active Transmitting Links and Minimum Number of Active Receiving Links must be set to the same value. The value of Minimum Number of Active Receiving Links must be smaller than or equal to the actual number of IMA members. This parameter must be set to the same value at the two ends of an IMA group.
IMA Protocol Version	1.0, 1.1	Sets the IMA protocol version. NOTE: The IMA protocols at the local end and opposite end should be of the same version.
IMA Transmit Frame Length	32, 64, 128, 256 Default: 128	Sets the IMA transmit length. The transmitting end periodically sends a special cell named ICP to each link, so that the receiving end can reassemble the cells from links with different lengths of delay. The number of cells between ICP cells is the IMA transmit length.
IMA Symmetry Mode	Symmetrical Mode and Symmetrical Operation, Symmetrical Mode and Asymmetrical Operation, Asymmetrical Mode and Asymmetrical Operation	Sets the IMA symmetry mode. Symmetrical Mode: The bandwidth of IMA group transmitting direction is consistent with that of IMA group receiving direction. Asymmetrical Mode: The bandwidth of IMA group transmitting direction is inconsistent with that of IMA group receiving direction. Symmetrical Operation: When some links fail, the transmitting bandwidth will be consistent with the receiving bandwidth. Asymmetrical Operation: When some links fail, the transmitting bandwidth will not be consistent with the receiving bandwidth.
Maximum Delay Between Links (ms)	1 to 120, 1 as the spacing	Sets the maximum delay variation among links of the IMA group.
Clock Mode	CTC Mode and ITC Mode	Specifies the clock mode for an IMA group. This parameter must be set to the same value at the two ends of an IMA group. CTC mode refers to the common transmit clock mode. ITC mode refers to the independent transmit clock mode. In CTC mode, all transmit clocks of the links in an IMA group are from the same clock source. In ITC mode, the transmit clocks of the links in an IMA group are from different clock sources. When the IMA group is set to the line clock mode, the ITC mode is recommended.

**Table 2** Descriptions of the parameters of the Associated Service
Field	Value	Description
Service Type	For example: ATM Service	Indicates the type of the service that is associated with the IMA group.
Service ID	For example: 20	Indicates the ID of the service that is associated with the IMA group. Click a service ID, the current window switches to the service management window of the corresponding service.
Service Name	For example: service	Indicates the name of the services that is associated with the IMA group.
Used Resource	-	Indicates the resource usage rate of the service associated with the IMA group.