Configuring the Link Services Interface with Quick Configuration

You can use the services interfaces Quick Configuration pages to do the following:

Configure the lsq-0/0/0 link services interface.
Configure multilink logical interfaces on the lsq-0/0/0 interface. Multilink logical interfaces allow you to bundle multiple serial interfaces such as T1, T3, E1, E3, and serial interfaces into a single logical link as follows:
- Bundle multiple Point-to-Point Protocol (PPP) links into a single Multilink Point-to-Point Protocol (MLPPP) logical link.
- Bundle multiple Frame Relay data-link connection identifiers (DLCIs) into a single Multilink Frame Relay (MLFR) logical link.

To configure the link services interface:

From the Quick Configuration page, as shown in Figure 16, select the link services interface—for example, lsq-0/0/0—you want to configure.
Enter information into the Quick Configuration page, as described in Table 114.
Click one of the following buttons:
- To apply the configuration and stay on the Quick Configuration page, click Apply.
- To apply the configuration and return to the main configuration page, click OK.
- To cancel your entries and return to the main page, click Cancel.

Table 114: Link Services Interface Quick Configuration Summary

Field	Function	Your Action
Logical Interfaces
Add logical interfaces	Defines one or more logical units that you connect to this link services interface. You must define at least one logical unit for the link services interface.	Click Add.
Logical Interface Description	(Optional) Describes the logical interface.	Type a text description of the logical interface to more clearly identify it in monitoring displays.
IPv4 Addresses and Prefixes	Specifies one or more IPv4 addresses for the interface.	Type one or more IPv4 addresses and prefixes. For example: 10.10.10.10/24 Click Add. Click OK.
Physical Interface Description	(Optional) Adds supplementary information about the physical link services interface.	Type a text description of the link services interface to more clearly identify it in monitoring displays.
Enable subunit queuing	Enables or disables subunit queuing on Frame Relay or VLAN IQ interfaces.	To enable subunit queuing, select the check box. To disable subunit queuing, clear the check box.
Multilink Bundle Options
Bandwidth	Specifies the informational-only bandwidth value for the logical interface.	Type the value.
Drop Timer Period	Specifies a drop timeout value (in milliseconds) to provide a recovery mechanism if individual links in the multilink bundle drop one or more packets. Note: Ensure that the value you specify is larger than the expected differential delay across the links, so that the timeout period does not elapse under normal jitter conditions, but only when there is actual packet loss.	Type a value between 0 and 2000.
Encapsulation	Specifies the encapsulation type for which you want to create a multilink bundle.	From the list, select one of the following: multilink-ppp—Creates a Multilink Point-to-Point Protocol (MLPPP) bundle. multilink-frame-relay-end-to-end—Creates a Multilink Frame Relay (MLFR) bundle.
Fragmentation Threshold	Specifies the maximum size, in bytes, for multilink packet fragments.	Type a value that is a multiple of 64 bytes between 64 and 16320—for example, 1024.
Links needed to sustain bundle	Specifies the minimum number of links required to sustain the multilink bundle.	Type a value between 1 and 8.
MRRU	Specifies the maximum packet size, in bytes, that the multilink interface can process.	Type a value between 1500 and 4500.
Short Sequence	Sets the length of the packet sequence identification number to 12 bits.	Select this check box.
Member Interfaces	Specifies the interfaces that are members of the multilink bundle. The Logical Interfaces list displays all the serial interfaces on the device. The Member Interfaces list displays the interfaces that are members of the multilink bundle. The following rules apply when you add interfaces to a multilink bundle: Only interfaces of the same type can be added to a multilink bundle. For example, a T1 and an E1 interface cannot be added to the same bundle. Only interfaces with the PPP encapsulation can be added to an MLPPP bundle and interfaces with the Frame Relay encapsulation can be added to an MLFR bundle. If you add an interface that is a member of an existing bundle, the interface is deleted from the existing bundle and added to the new bundle.	To add an interface in the multilink bundle, select the interface in the Logical Interfaces list and click the left arrow button to add it in the Member Interfaces list. To remove an interface from the multilink bundle, select the interface in the Member Interfaces list and click the right arrow button to remove it from the Member Interfaces list.