Setting Up Ports

Updated on 01 Oct 2024
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You can configure the parameters for each port on the unit to manage options, such as protection (when available), link speed (auto-negotiation) and flow control.
The Cisco Provider Connectivity Assurance Sensor LT-S (formerly Skylight element: LT/LT-S) is available in two models with the following physical traffic ports:

Port Number	Port Speed	Connector Type
PORT-1	1GbE	SFP-1
PORT-2	1GbE	SFP-2
PORT-3	1GbE	SFP-3
PORT-4	1GbE	SFP-4
PORT-5	1GbE/10 GbE	SFP-5
PORT-6	1GbE/10 GbE	SFP-6
PORT-7	1GbE/10 GbE	SFP-7
PORT-8	1GbE/10 GbE	SFP-8
PORT-9	1GbE	RJ45-9 or SFP-9
PORT-10	1GbE	RJ45-10 or SFP-10
PORT-11	1GbE	RJ45-11 or SFP-11
PORT-12	1GbE	RJ45-12 or SFP-12

The Assurance Sensor LT-S supports fiber SFPs, as shown below:

Port Number	10G Fiber	1G Fiber	100M Fiber	10M Fiber	10G Copper	1G Copper	100M Copper	10M Copper
Ports 1-4	No	YES	No	No	No	YES	YES	YES
Ports 5-6	YES	YES	No	No	No	YES	No	No
Ports 7-8	No	YES	No	No	No	YES	No	No
Ports 9-12	No	YES	YES	YES	No	No	No	No

In addition to its physical ports, the unit also provides six LAG ports for protecting the physical ports. Each LAG port protects SFP/RJ45 ports in the following way:

LAG-1 protects PORT-1 and PORT-2. Traffic is mapped to Traffic-1.
LAG-2 protects PORT-3 and PORT-4. Traffic is mapped to Traffic-3.
LAG-3 protects PORT-5 and PORT-6. Traffic is mapped to Traffic-5.
LAG-4 protects PORT-7 and PORT-8. Traffic is mapped to Traffic-7.
LAG-5 protects PORT-9 and PORT-10. Traffic is mapped to Traffic-9.
LAG-6 protects PORT-11 and PORT-12. Traffic is mapped to Traffic-11.

To view current port settings

Access the page Port ▶Configuration.
A list of all ports and their current status is displayed.

Note: The information displayed will vary depending on the model you are using.

For more information on specific parameters, refer to the following table.

CAUTION: If you set the Port MTU to a value smaller than 1518 bytes on a port used for management, you or another user may lose access to the management Web interface.

Port Configuration and Status (Port ▶Configuration)

Parameter	Description
Status	The following colors in the summary page indicate the port status: Green: The port is up and running. Blue: Indicates that a signal is detected, but that the protection mode for the parent LAG port is "Link-status" and the port is not the working connector. Red: The port is enabled, but the physical link is down and no signal is detected. Yellow: The port is not totally functional. Gray: The port is disabled.
Connector	The type of physical connector associated with the port. Available options are: SFP RJ45 Management
Port Name	The name of the port. By default, Assurance Sensor LT-S ports are named as follows: PORT-1, PORT-2, PORT-3, PORT-4, PORT-5, PORT-6, PORT-7, PORT-8 PORT-9, PORT-10, PORT-11, PORT-12, Management, LAG-1, LAG-2, LAG-3, LAG-4, LAG-5 and LAG-6.
Port State	The port may be either enabled or disabled.
Speed	Sets the port speed and duplex type. Auto-negotiation: The unit automatically negotiates port speed and duplex type with the device to which it is connected. For autonegotiation to be successful, the other device must also be set up for auto-negotiation. On other devices, if Auto-Negotiation is not in use, you can manually define the port speed: 10 Mbps 100 Mbps 1 Gbps 10 Gbps On other devices, if auto-negotiation is not in use, you can manually define the duplex type: Half-Duplex: Transmission in one direction at a time. Full-Duplex: Transmission in both directions at the same time. Note: Unsupported options, if any, are disabled. In 1G mode, auto-negotiation may be selected (advertises 1000 Mbps, full-duplex only). On the Assurance Sensor LT-S , auto-negotiation is not supported by 10G SFPs when inserted in PORT-5, PORT-6, PORT-7 or PORT-8. Auto-negotiation is mandatory for 1000 BASE-T. If you are using a LAG port with the protection mode set to link status, you must enable auto-negotiation on the physical port associated with the LAG port.
MAC Address	The MAC address assigned to the port, for example 00:15:AD:1D:72:00.

To configure current port settings

Access the page Port ▶Configuration.
A list of all ports and their current status is displayed.
Click the name of the port's settings under the Port Name heading.
The Port Configuration page is displayed.
Enter values in the required fields, then click Apply.

Note: When disabling a regular port or a LAG port, the following message will be displayed "Configuration changes are service affecting. Are you sure you want to proceed?". Click OK to proceed with your changes or Cancel to go back to the previous screen.

For more information on specific parameters, refer to the following table.

CAUTION: If you set the Port MTU to a value smaller than 1518 bytes on a port used for management, you or another user may lose access to the management Web interface.

<Port_Name> Port Configuration (Port ▶Configuration)

Parameter	Description
Enable	Select this box to enable this port.
Name	Enter a name to identify this port. By default, Assurance Sensor LT-S ports are named as follows: PORT-1, PORT-2, PORT-3, PORT-4,PORT-5, PORT-6, PORT-7, PORT-8, PORT-9, PORT-10, PORT-11, PORT-12, Management, LAG-1, LAG-2, LAG-3, LAG-4, LAG-5 and LAG-6. *.
Alias	The port's assigned alias name as specified by a network manager.
Port MTU	The maximum transmission unit that a port can receive and forward, including all headers; expressed in bytes. When a LAG port is enabled, the physical ports enslaved by the LAG port must have the same MTU settings to ensure error-free transmission. Supported values: 64–10240 Default value: 2000 Notes: Setting the MTU to a value smaller than 1518 bytes on a port used for management may cause a loss of access to the unit. The MTU size supports up to 12 additional bytes over and above the defined value to account for a VLAN stack of up to three tags.
Large Packet Threshold	Packets above this threshold will be classified as Large Packets. The Large Packets count can be viewed on the Port ▶Statistics page.
MAC Address	The MAC address assigned to the port, for example 00:15:AD:1D:72:00.
Connector	The type of physical connector associated with the port. Available options are: SFP RJ45 Management
Media Selection Mode	When configuring a dual-media port, make a selection from the dropdown list to indicate either Automatic or Manual mode.
Selected/Preferred Connector (Dual-media ports only)	When configuring a dual-media port, make a selection from the dropdown list to indicate whether the preferred media type is SFP or RJ45 (copper). Switching between media types has an impact on traffic. Approximate switching times are as follows: SFP preferred ▶RJ45: 6 seconds SFP preferred ▶SFP (switch back): 0.07 seconds RJ45 preferred ▶SFP: 3 seconds RJ45 preferred ▶RJ45 (switch back): 3 seconds /li> Notes: UThe Skylight Assurance Sensor LT-S has been designed with specific behavior when the one type of link is connected, but the other media type is defined as preferred. When there is no active link on the port, the Port ▶Configuration page will display the last active connector, even the preferred connector is changed and the port is set to automatic mode. For example, in the event that the RJ45 link is disconnected, damaged or otherwise goes off-line, the system will continue to display the media type as RJ45; no attempt will be made to update the display to indicate the SFP as the preferred media type. The advantage to this behavior is that you can consult the Port ▶Configuration page in order to determine which media type was connected when the fault occurred.
Enable Fault Propagation	Enables the propagation of link faults (or LACP status) between the ports specified in the field Propagate From Port.
Fault Propagation Mode	One-Way Link: Propagate faults in one direction based on the link status of the opposite port. One-Way EVC: Propagate faults in one direction based on the link status of the opposite port or based on the EVC status.
Propogate From Port	The port for fault propagation may be one of the following: PORT-5 or PORT-6: The unit propagates the fault from any port other than itself, or any LAG other than LAG-3 PORT-7 or PORT-8: The unit propagates the fault from any port other than itself, or any LAG other than LAG-4 LAG-3: The unit propagates the fault from any port other than PORT-5 or PORT-6, or from any LAG other than itself. LAG-4: The unit propagates the fault from any port other than PORT-7 or PORT-8, or from any LAG other than itself. Note: In the case of a LAG, you must first enable the Protection box, then click Apply. The Propagate From Port drop-down list will then be displayed.
Speed Link Speed	Sets the port speed and duplex type. Auto-negotiation: The unit automatically negotiates port speed and duplex type with the device to which it is connected. For autonegotiation to be successful, the other device must also be set up for auto-negotiation. On other devices, if Auto-Negotiation is not in use, you can manually define the port speed: 10 Mbps 100 Mbps 1 Gbps 10 Gbps On other devices, if auto-negotiation is not in use, you can manually define the duplex type: Half-Duplex: Transmission in one direction at a time. Full-Duplex: Transmission in both directions at the same time. Note: Unsupported options, if any, are disabled. In 1G mode, auto-negotiation may be selected (advertises 1000 Mbps, full-duplex only). On the Assurance Sensor LT-S , auto negotiation is not supported by 10G SFPs when inserted in PORT-5, PORT-6, PORT-7 or PORT-8. If you are using a LAG port with the protection mode set to link status, you must enable auto-negotiation on the physical port associated with the LAG port.
Link Loss Return (LLR) Note: (SFP fiber ports only)	This option determines how the unit notifies its link partner when a valid receive signal is absent on the link. If LLR is disabled, then: For 1000BASE-X links, a Remote Fault Indicator (RFI) using auto-negotiation advertisement is sent to the link partner. For 100BASE-FX links, the Far End Fault Indication (FEFI) idle pattern is sent to the link partner. If LLR is enabled, the unit turns off its transmitter for the lapse of time defined in the LLR Period, after which it is re-enabled. This cycle is repeated until the link is re-established. Entering a value of 0 puts the laser into a disabled state waiting for the opposite side to send a light pulse to re-establish the link. Consequently, a value of 0 should not be configured on both sides, otherwise the link will never be re-established.
Internal Loopback Enable	Click this box to enable or disable the internal loopback mode. Enabling the system loopback mode redirects the transmitted frames to the receive path. Timeout value has a range of 0–60 minutes. The default is 5 minutes.
Protection Enable	Enable protection for this port. The protecting port is reserved by the protection mechanism and cannot be used for monitoring purposes as long as the protection is enabled. Note: This parameter is only available on LAG ports. When using Fault propagation with LAG port protection, you must enable the protection on both LAG ports for the fault propagation to work correctly.
Protection Mode	Switching protection to a standby port can be based on link status, LACP status or ERP status. If you select LACP status, you must create an L2PT rule with an operation mode of Peer and protocol LACP on this port in order to terminate LACP frames. If you select LACP status, you must also set up LAG protection in the page Protection ▶LACP ▶Configuration. If you select link status for a LAG port, you must enable autonegotiation on the physical port associated with the LAG port. If you select ERP status, you must also set up ERP protection in the page Protection ▶ERP ▶Configuration. Note: This parameter is only available on LAG ports.
Working Connector	The working physical port for the specified LAG port. Choosing the port allows you to perform a manual switchover operation. Note: This parameter is only available on LAG ports with the Protection Mode set to link status or LACP status.
Revertive	When enabled, the traffic is switched back to the main port after the reversion period has expired. Note: This parameter is only available on LAG ports with protection mode set to link status or LACP status.
Revertive Period	The time, expressed in seconds, that the system must continuously detect a valid signal on the main port in order to switch back to this port. Notes: The timer is restarted if a signal loss is detected during this period. This parameter is only available on LAG ports with protection mode set to Link Status or LACP Status.
Link Time Out	The time, expressed in seconds, to wait for the link to come up after switching to the standby port. If the timer expires and the link stays down, the system switches back to the working port. Notes: In a back-to-back deployment, it is recommended to set a different link timeout on each unit for a faster link-up time. This parameter applies to only link status and is available only on LAG ports.
Version	The G.8032 protocol version used. Supported options are: 1: ERP version 1. Only one instance of ERP is supported per LAG port. 2: ERP version 2. Multiple instances of ERP can be set up per LAG port. Notes: It is recommended to always use ERP version 2, unless the unit needs to interoperate with another unit that only supports version 1. This parameter only applies to ERP status and is only available on LAG 3
Flow Control	Supported options are: Disable: Pause frames are disabled. Local: Pause frames are processed locally. Note: This parameter is not available on LAG ports.
LLDP Enable	Enable or disable LLDP (Link Layer Discovery Protocol) frame transmission on the port. Notes: This parameter is available on Auxiliary ports only. This parameter is not available on LAG ports.
Rate	The LLDP frame transmission rate on the port, expressed in seconds. Range: 1–3,600 Note: This parameter is not available on LAG ports.
TTL	The Time To Live (TTL) of the LLDPDU frames transmitted on the port. This value is automatically set by the system to [4 x Tx Rate + 1 second]. Note: This parameter is not available on LAG ports.
Current Status	The current link speed and duplex type of the port. Current Connector Configuration: If the link partner is also using Auto MDI, the resulting connector configuration is correct but random. A cross-over cable present on the cabling plant results in both partners using the same connector configuration. Mastership Mode: On 1-Gbps copper ports, this reports the clock mastership mode. In auto mode, the clock master is determined by the auto-negotiation process. In forced mode, the clock is forced into slave if the port is a clock reference for the system, otherwise it is master. Besides, the current status can be: Link Down: The physical link is down and no signal is detected (when a port is disabled, Current Status will also show Link Down). Link Dormant: The port is enabled and a signal is detected but the port cannot forward traffic, as it is in a "stand-by" state. Note: There will be no 'Link down on <port_name> port' alarm on member ports when the parent LAG port is in Fault Propagation state.

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