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Table Of Contents

Configuring PSM Interfaces

Enabling Wdmsplit Interfaces

Displaying Wdmsplit Interface Information

Configuring Trunk Fiber Based Protection

Displaying Trunk Fiber Protection Configuration

About Switchovers and Optical Power Thresholds

Unamplified Topologies

Post-Amplified Topologies

Post-Amplified and Preamplified Topologies

Configuring Optical Power Thresholds

Configuring Patch Connections

Displaying Patch Connections

Configuring Wdmsplit Interfaces in the Network Topology

Displaying Topology Information for Wdmsplit Interfaces


Configuring PSM Interfaces

This chapter describes how to configure PSM (protection switch module) interfaces and patch connections on the Cisco ONS 15530. This chapter includes the following sections:

• Enabling Wdmsplit Interfaces

• Configuring Trunk Fiber Based Protection

• About Switchovers and Optical Power Thresholds

• Configuring Optical Power Thresholds

• Configuring Patch Connections

• Configuring Wdmsplit Interfaces in the Network Topology

Enabling Wdmsplit Interfaces

To enable the PSM wdmsplit interfaces, perform the following tasks, starting in global configuration mode:

 
Command
Purpose

Step 1 

Switch(config)# interface wdmsplit slot/subcard/0

Switch(config-if)#

Specifies the west wdmsplit interface and enters interface configuration mode.

Step 2 

Switch(config-if)# no shutdown

Enables the interface.

Step 3 

Switch(config-if)# exit

Switch(config)#

Returns to global configuration mode.

Step 4 

Switch(config)# interface wdmsplit slot/subcard/1

Switch(config-if)#

Specifies the east wdmsplit interface and enters interface configuration mode.

Step 5 

Switch(config-if)# no shutdown

Enables the interface.

Example

The following example shows how to enable wdmsplit interfaces:

Switch(config)# interface wdmsplit 0/0/0
Switch(config-if)# no shutdown
Switch(config-if)# exit
Switch(config)# interface wdmsplit 0/0/1
Switch(config-if)# no shutdown

Displaying Wdmsplit Interface Information

The following example shows how to display wdmsplit interface information.

Switch# show interface wdmsplit 0/1/0
WdmSplit0/1/0 is administratively down, line protocol is down
Status :Active
Received power :0.00 dBm (EF9)
Threshold Value :-22.00 dBm (8CE)

Optical threshold monitored for :Receive Power (in dBm)
Low alarm value = -22.0 dBm (default)
Low Alarm Severity = major
Low warning value = -20.0 dBm (default)
Low Warning Severity = not alarmed
High alarm value = -2.0 dBm (default)
High Alarm Severity = major
High warning value = -4.0 dBm (default)
High Warning Severity = not alarmed
Hardware is split wavelength_add_drop

Configuring Trunk Fiber Based Protection

To configure trunk fiber protection on the wdmsplit interfaces, perform the following steps, beginning in global configuration mode:

 
Command
Purpose

Step 1 

Switch(config)# redundancy

Switch(config-red)#

Enters redundancy mode.

Step 2 

Switch(config-red)# associate group name

Switch(config-red-aps)#

Specifies an APS group name and enters APS configuration mode.

Note The group name is case sensitive.

Step 3 

Switch(config-red-aps)# aps working wdmsplit slot/subcard/port

Configures the working path interface.

Step 4 

Switch(config-red-aps)# aps protection wdmsplit slot/subcard/port

Configures the protection path interface.

Step 5 

Switch(config-red-aps)# aps message-channel {auto-select | inband dcc | ip | osc} far-end name

Configures the name of the corresponding APS group on the other node in the topology.

Step 6 

Switch(config-red-aps)# aps enable

Enables APS activity between the interfaces.

For more information on configuring APS and trunk fiber based protection, refer to Chapter 12, "Configuring APS."

Examples

The following example shows how to configure trunk fiber protection:

Switch(config)# redundancy
Switch(config-red)# associate group psm-group
Switch(config-red-aps)# aps working wdmsplit 0/1/0
Switch(config-red-aps)# aps protection wdmsplit 0/1/1
Switch(config-red-aps)# aps message-channel auto-select far-end group-name psm-group
Switch(config-red-aps)# aps enable

Displaying Trunk Fiber Protection Configuration

To display the trunk fiber configuration, use the following EXEC command:

Command
Purpose

show aps {detail | group name | interface wavepatch slot/subcard/port}

Displays detailed APS configuration information for groups and interfaces.

Note Group names are case sensitive.


Examples

The following example shows how to display the protocol encapsulation configuration of a wdmsplit interface:

Switch# show aps group psm-group
APS Group psm-group :

architecture.:1+1, remote prov:unknown
span.........:end-to-end
prot. mode...:network side wdm splitter
direction....:prov:uni, current:uni, remote prov:unknown
revertive....:no
aps state....:enabled (associated)
request timer:holddown:5000 ms, max:15000 ms, count 2
msg-channel..:auto (down), psm-group
created......:2 minutes
auto-failover:disabled
transmit k1k2:sf-lp, 0, 0, 1+1, uni
receive k1k2:no-request, 0, 0, unknown, unknown
switched chan:0
protection(0):WdmSplit0/0/1 (STANDBY - UP)
:channel request:sf-lp
:switchover count:1
:last switchover:0 minutes
working...(1):WdmSplit0/0/0 (ACTIVE - UP)
:channel request:sf-lp
:switchover count:1
:last switchover:0 minutes

About Switchovers and Optical Power Thresholds

The switchovers for trunk fiber protection on the PSM are controlled by an optical power threshold value set in the CLI. The value to set is determined by the characteristics of the point-to-point topology. The PSM supports the following types of point-to-point topologies:

•Unamplified

•Post-amplified

•Preamplified and post-amplified

Note Due to the cumulative effect of the noise from the EDFAs (erbium-doped fiber amplifiers), the PSM cannot support point-to-point topologies with more than two EDFAs on the trunk fiber. For topologies with three or more EDFAs on the trunk fiber, use splitter based protection.

Unamplified Topologies

A topology without amplification is the simplest case. Figure 11-1 shows an unamplified topology and the locations where failures can occur.

Figure 11-1 Point-to-Point Topology Without Amplification

1

Trunk fiber cut

3

Individual channel failures

2

OADM module-to-PSM patch cable cut

   

Note The minimum channel power into the EDFA must be -15 dBm or higher.

The switching behavior for the failures is as follows:

•Trunk fiber cut

The receive power on the active path drops below the minimum detectable level (-31 dBm) and the PSM switches over to the standby path.

•OADM module-to-PSM patch cable cut

In this case, the receive power on both the active and standby paths drops below the minimum detectable level. However, a switchover will occur if the auto-failover is enabled in the hardware. Since the system monitors the standby signal at 1 second intervals, the system might not detect the standby signal failure before the switchover occurs. After this switchover, no further switchovers occur.

•Individual channel failures

No switchover occurs because the change in the channel power is less than 15 dB.

The recommended low alarm threshold value for this topology is -28 dBm and the low warning threshold is at least -26 dBm.

Post-Amplified Topologies

Figure 11-2 shows an example topology with post-amplification and the locations where failures can occur.

Figure 11-2 Point-to-Point Topology with Post-Amplification

1

Trunk fiber cut

3

OADM module-to-PSM patch cable cut

2

PSM-to-EDFA patch cable cut

4

Individual channel failures


Note The minimum channel power into the EDFA must be -15 dBm or higher.

The switching behavior for the failures is as follows:

•Trunk fiber cut

The receive power on the active path drops below the minimum detectable level (-31 dBm), and the PSM switches over to the standby path.

•PSM-to-EDFA patch cable cut

The EDFA generates -9 dBm of noise on the active path so the PSM receives (-9 - D) dBm signal power where D is the link loss between the EDFA and the PSM receiver. If the low alarm optical threshold is set correctly, the PSM switches over to the standby path.

•OADM module-to-PSM patch cable cut

The EDFA generates -9 dBm of noise on both paths so the PSM receives (-9 - D) dBm signal power where D is the link loss between the EDFA and the PSM receiver. If auto-failover is enabled and the low alarm optical threshold is set correctly, the PSM switches to the standby path before it detects that the standby path has also failed. No further switchovers occur.

•Individual channel failures

No switchover occurs because the change in the channel power is less than 15 dB.

The recommended value for the low alarm optical threshold is (-6 - D) dBm, and the low warning threshold is at least 2 dB higher.

Post-Amplified and Preamplified Topologies

Figure 11-3 shows a topology with post-amplification and preamplification and the locations where failures can occur.

Figure 11-3 Point-to-Point Topology with Post-Amplification and Preamplification

1

EDFA-to-PSM patch cable cut

4

OADM module-to-PSM patch cable cut

2

Trunk fiber cut

5

Individual channel failures

3

PSM-to-EDFA patch cable cut

 

 


Note The minimum channel power into the EDFA must be -15 dBm or higher.

The switching behavior for the failures is as follows:

•EDFA-to-PSM patch cable cut

The receive power on the active path drops below the minimum detectable level (-31 dBm) and the PSM switches over to the standby path.

•Trunk fiber cut

The EDFA generates -9 dBm of noise so the PSM receives (-9 - L) dBm signal power, where L is the output attenuation from the EDFA. The PSM switches over to the standby path if the low alarm threshold is correctly configured.

•PSM-to-EDFA patch cable cut

The receive power drops but not below the minimum detectable level because of the cumulative noise from the two EDFAs. The PSM switches over to the standby signal if the low alarm threshold is correctly configured.

•OADM module-to-PSM patch cable cut

The receive power drops but not below the minimum detectable level because of the cumulative noise from the two EDFAs. If auto-failover is enabled, the PSM switches to the standby path before it detects that the standby path has also failed. No further switchovers occur.

•Individual channel failures

No switchover occurs because the change in the channel power is less than 15 dB.

Figure 11-4 shows an example topology and the locations where failures can occur.

Figure 11-4 Failure Scenario with Noise from Two EDFAs

You can calculate the noise using the following formula:

10 dB * log(10((-9)/10) + 10((-9-D+17)/10))  dB - L dB

where D is the link loss between the EDFAs and L is equal to 17 minus the configured gain on the EDFA closest to the PSM receiver.

The recommended value for the low alarm optical threshold is the calculated noise value plus 3 dBm.

Set the low warning threshold at least 2 dB higher.

Configuring Optical Power Thresholds

The optical power thresholds provide a means of monitoring the signal power received from the active trunk fiber path. Two types of thresholds are provided:

•Low alarm

•Low warning

When the low alarm threshold is crossed on the active path, the PSM switches over to the standby path. When either of the thresholds are crossed, the system sends messages to the console and generates traps, if traps are enabled.

To configure optical power thresholds for wdmsplit interfaces on a PSM, perform the following steps, beginning in global configuration mode:

 
Command
Purpose

Step 1 

Switch(config)# interface wdmsplit slot/subcard/0

Switch(config-if)#

Selects wdmsplit interface that carries traffic for the west direction and enters interface configuration mode.

Step 2 

Switch(config-if)# optical threshold power receive {low | high} {alarm | warning} value [severity {critical | major | minor | not alarmed | not reported}]

Specifies the optical power threshold value in units of 0.1 dBm. The range is -280 to 0. The default values are as follows:

Low alarm: -22 dBm

Low warning: -20 dBm

Alarm severity: major

Warning severity: not alarmed

Step 3 

Switch(config-if)# exit

Switch(config)#

Returns to global configuration mode.

Step 4 

Switch(config)# interface wdmsplit slot/subcard/1

Switch(config-if)#

Selects the wdmsplit interface that carries traffic for the east direction and enters interface configuration mode.

Step 5 

Switch(config-if)# optical threshold power receive {low | high} {alarm | warning} value [severity {critical | major | minor | not alarmed | not reported}]

Specifies the optical power threshold value in units of 0.1 dBm.

Examples

The following example shows how to configure optical power thresholds for wdmsplit interfaces on a PSM:

Switch(config)# interface wdmsplit 0/1/0
Switch(config-if)# optical threshold power receive low alarm -27
Switch(config-if)# optical threshold power receive low warning -25
Switch(config-if)# exit
Switch(config)# interface wdmsplit 0/1/1
Switch(config-if)# optical threshold power receive low alarm -26
Switch(config-if)# optical threshold power receive low warning -24

Displaying Optical Power Threshold Configuration

To display the optical power thresholds for a wdmsplit interface, use the following EXEC command:

Command
Purpose

show interfaces wdmsplit slot/subcard/port

Displays interface information.


Example

The following example shows how to display the optical threshold configuration for an interface:

Switch# show interfaces wdmsplit 0/1/0
WdmSplit0/1/0 is administratively down, line protocol is down
Status :Active
Received power :0.00 dBm (EF9)
Threshold Value :-22.00 dBm (8CE)

Optical threshold monitored for :Receive Power (in dBm)
Low alarm value = -22.0 dBm (default)
Low Alarm Severity = major
Low warning value = -20.0 dBm (default)
Low Warning Severity = not alarmed
High alarm value = -2.0 dBm (default)
High Alarm Severity = major
High warning value = -4.0 dBm (default)
High Warning Severity = not alarmed
Hardware is split wavelength_add_drop

Configuring Patch Connections

To configure patch connections between a PSM and an OADM module, use the following global configuration command:

Command
Purpose

patch wdm slot/subcard1 wdmrelay slot/subcard2/port

or

patch wdmrelay slot/subcard1/port wdm slot/subcard2

Configures the patch connection between a PSM and an OADM module.

patch wavepatch slot/subcard/port wdmrelay slot/subcard2/port

or

patch wdmrelay slot/subcard1/port wavepatch slot/subcard/port

Configures the patch connection between a PSM and a 2.5-Gbps transponder module or 10-GE transponder module.

Note If you connect to a transponder line card, you must use IP to manage your network topology. If you connect to an ITU trunk card, you must use the ethernetdcc interface to manage your network topology.


Note When the patch between a wdm interface and a wdmrelay interface is configured, CDP topology learning on the wdm interface is disabled.

Example

The following example shows how to configure the patch connections between a PSM and an OADM module:

Switch# configure terminal
Switch(config)# patch wdm 0/0 wdmrelay 0/1/0

Displaying Patch Connections

To display the patch connections, use the following privileged EXEC command:

Command
Purpose

show patch [detail]

Displays the patch connections.

show interfaces {wdm slot/subcard1 | wdmrelay slot/subcard2/port | wavepatch slot/subcard/port}

Displays the interface information.


Example

The following example shows the patch connections:

Switch# show patch
Patch Interface Patch Interface Type Dir Error
------------------ ------------------ --------- ---- ----------------
Wdm0/0 WdmRelay0/1/0 USER Both

Switch# show interfaces wdm0/0
Wdm0/0 is up, line protocol is up
Patched Interface(s) :WdmRelay0/1/0
Wdm Hw capability:N/A
Num of Wavelengths Add/Dropped:5
List of Wavelengths:0, 13, 14, 15, 16
Hardware is wavelength_add_drop

Configuring Wdmsplit Interfaces in the Network Topology

The wdmsplit interfaces on a PSM do not support CDP and must be manually configured in the network topology.

Note The patch connection between the PSM and the OADM module, ITU trunk card, or transponder line card must be configured correctly. For more information on configuring the patches for these interfaces, see the "Configuring Patch Connections" section.

Note When a patch connection between an OADM module and a PSM is configured, topology learning on the wdm interface is disabled.

To add wdmsplit interfaces to the network topology, perform the following steps on the wdmsplit interfaces on both the nodes in the point-to-point network topology, beginning in global configuration mode:

 
Command
Purpose

Step 1 

Switch(config)# interface wdmsplit slot/subcard/0

Switch(config-if)#

Selects the west wdmsplit interface to configure and enters interface configuration mode.

Step 2 

Switch(config-if)# topology neighbor {name node-name | ip-address node-ip-address | mac-address node-mac-address} {port {name port-name | ip-address port-ip-address | mac-address port-mac-address}}

Configures the network topology information for the neighboring node.

Step 3 

Switch(config-if)# topology neighbor agent ip-address ip-address

Specifies the IP address of the network topology agent on the neighboring node.

Step 4 

Switch(config-if)# exit

Switch(config)#

Returns to interface configuration mode.

Step 5 

Switch(config)# interface wdmsplit slot/subcard/1

Switch(config-if)#

Selects the east wdmsplit interface to configure and enters interface configuration mode.

Step 6 

Switch(config-if)# topology neighbor {name node-name | ip-address node-ip-address | mac-address node-mac-address} {port {name port-name | ip-address port-ip-address | mac-address port-mac-address}}

Configures the network topology information for the neighboring node.

Step 7 

Switch(config-if)# topology neighbor agent ip-address ip-address

Specifies the IP address of the network topology agent on the neighboring node.

Example

The following example shows how to add wdmsplit interfaces to the network topology:

Switch(config)# interface wdmsplit 1/1/0
Switch(config-if)# topology neighbor name NodeB port name wdmsplit1/1/0
Switch(config-if)# topology neighbor agent ip-address 10.1.1.1
Switch(config-if)# exit
Switch(config)# interface wdmsplit 1/1/1
Switch(config-if)# topology neighbor name NodeB port name wdmsplit1/1/1
Switch(config-if)# topology neighbor agent ip-address 10.1.1.1

Displaying Topology Information for Wdmsplit Interfaces

To display the topology information for wdmsplit interfaces, use the following EXEC command:

Command
Purpose

show topology neighbor

Displays network topology information.


Example

The following example shows how to display the topology information:

Switch# show topology neighbor
Physical Topology:

Local Port Neighbor Node Neighbor Port Link Dirn
---------- ------------- ------------- ---------
WdmSplit0/1/0 PSM-2 wdms0/1/0 Both
WdmSplit0/1/1       PSM-2 wdms0/1/1            Both

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Posted: Tue Feb 28 04:07:23 PST 2006
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