Table Of Contents
Network Clocking on Cisco 7600 Series Ethernet Services Plus Line Cards
Contents
Information About Network Clocking
How to Configure Network Clocking
Configuring BITS Clock Support
Usage Guidelines
Example
Configuring 10GE Interface as Clock Source
Usage Guidelines
Example
Verifying the Clock Source
Clock Source Recovery
Cisco 7600 Synchronous Ethernet
Restrictions and Usage Guidelines
Configuring Synchronous Ethernet on the Cisco 7600 Router with ES+ Line Card
Configuring the Clock Recovery from SyncE
Configuring the Clock Recovery from BITS Port
Configuring the System to External
Configuring the Line to External
Managing Synchronization on ES+ Card
Verification
Network Clocking on Cisco 7600 Series Ethernet Services Plus Line Cards
This chapter provides information about configuring network clocking on the following Cisco 7600 Series ES+ Extended Transport (ES+XT) line cards:
•
76-ES+XT-2TG3CXL
•76-ES+XT-4TG3CXL
For more information about the commands in this chapter, see the Cisco IOS Release 12.2 SR Command References at http://www.cisco.com/univercd/cc/td/doc/product/software/ios122sr/cr/index.htm.
Note The information provided in this chapter is applicable to both the ES+ and ES+T line cards unless specified otherwise.
Contents
This chapter contains the following sections:
•Information About Network Clocking
•How to Configure Network Clocking
Information About Network Clocking
The network clocking support for 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL line cards is built on top of the existing network clocking feature with SIP-200 and SIP-400 line cards. All the original network clock sources provided by SPA interfaces on SIP-200 and SIP-400 line cards operate the same way as before. Additionally, you can use network clocking support for the 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL to configure:
•BITS clock source
•10GE interface clock source
These enhancements provide Synchronous Ethernet (SyncE) feature support for service provider applications making the 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL line cards the preferred choices for carrier Ethernet environments.
The 76-ES+XT-2TG3CXL or 76-ES+XT-4TG3CXL line cards operate in three different modes for clock synchronization depending on the configuration and the current source state.
•Free-running—A line card that is not participating in network clocking or a line card that is actively sourcing the clock operates in free-running mode. In this mode, the line card internal oscillator generates the reference clock to the backplane.
Note In a nonpartcipating mode or a disabled mode, the line card distributes a Stratum 3-quality timing signal to an external reference clock. Other interfaces on different line cards receive either the backplane reference clock or the external reference clock depending on their configurations.
Note Line card operation is in free-running mode only if it is not participating in the system clocking, is configured as the active source using on-board oscillator, or does not currently have a valid clock source before the first clock synchronization; otherwise the line cards operate in normal mode.
• Normal—In normal mode, the module synchronizes with an externally supplied network timing reference, sourced from one of the chassis BITS inputs or recovered from a network interface. In this mode, the accuracy and stability of the output signal is determined by the accuracy and stability of the input reference.
•Holdover—In holdover mode, the network timing module generates a timing signal based on the stored timing reference used when operating in normal mode. Holdover mode is automatically selected when the recovered reference is lost or has drifted excessively.
Note You cannot configure the drift range; it is set internally on the line card to +/-9.2~12 ppm (parts per million) by default. This ppm setting is typical for applications that requires a clock quality level of Stratum 3/3E, ITU-T G.813 option 1.
Note All line cards operate in the free-running mode until the network clock is configured.
How to Configure Network Clocking
The following sections provide information on configuring network clocking:
•Configuring BITS Clock Support
•Configuring 10GE Interface as Clock Source
•Verifying the Clock Source
•Clock Source Recovery
Configuring BITS Clock Support
You can select and configure the BITS port on the 76-ES+XT-2TG3CXL or 76-ES+XT-4TG3CXL line card as the system clock source. This will synchronize the system backplane clock with the corresponding BITS port input clock and distribute the BITS port input clock across the chassis as the transmit clock reference for all other interfaces that support network clocking.
Usage Guidelines
Use the following guidelines:
•When the network clocking configuration is present in the startup configuration, the clocking configuration is not applied until five minutes after the configuration has been parsed. This prevents clocking instability on the backplane when the interfaces and controllers come up out of order.
•Network clocking is enabled by default for the 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL.
•Cisco IOS Release 12.2(33)SRD1 does not support synchronization status messaging (SSM) through BITS input.
•If there is a BITS clock source flap because of Loss of Signal (LOS), Loss of Frame (LOF), T1 Blue Alarm, or E1 Alarm Indication Signal (AIS), there is an interval of 150 seconds before the source becomes valid and active.
•In the event of an Out-of-Range (OOR) switchover (revertive mode), the source switchover occurs when the clock offset crosses the +/-12 ppm threshold. If this occurs, you must reconfigure the source.
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock slot slot bits number {2m | e1 [crc4] | j1 [esf]| t1 [d4 | esf [133ft | 266ft | 399ft | 533ft | 655ft]}
4. network-clock select priority slot slot bits number
5. exit
Detailed Steps
To configure BITS clock support for the Cisco 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL, use the following commands.
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
network-clock slot slot bits number {2m
| e1 [crc4] | j1 [esf]| t1 [d4 | esf
[133ft | 266ft | 399ft | 533ft |
655ft]}
Example:
Router(config)# network-clock slot 1
bits 0
|
(Optional) Configure BITS port signaling types.
The default signal type is T1 with ESF framing and a Line Build-Out Select value of 133 feet.
|
Step 4
|
network-clock select priority slot slot
bits number
Example:
Router(config)# network-clock select 1
slot 1 bits 0
|
Names a source to provide timing for the network clock and specifies the selection priority for this clock source.
|
Step 5
|
exit
Example:
Router(config)# exit
|
Exits global configuration mode and returns to privileged EXEC mode.
|
Example
The following example shows how to configure BITS clock support for the Cisco 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL.
Router# configure terminal
Router(config)# network-clock slot 1 bits 0 ?
2m 2.048MHz square wave signal type
Router(config)# network-clock slot 1 bits 0 t1 ?
Router(config)# network-clock slot 1 bits 0 t1 d4 ?
133ft Line Build-Out Select 0 to 133 feet
266ft Line Build-Out Select 133 to 266 feet
399ft Line Build-Out Select 266 to 399 feet
533ft Line Build-Out Select 399 to 533 feet
655ft Line Build-Out Select 533 to 655 feet
Router(config)# network-clock slot 1 bits 0 t1 d4 266ft
Router(config)# network-clock select 1 slot 1 bits 0
Configuring 10GE Interface as Clock Source
This will set up the line card to extract the received clock from the 10GE interface, either the LAN PHY or the WAN PHY, and have the system backplane clock synchronized to it. Then the system will use it as the transmission clock reference for all other interfaces in the chassis that support the network clocking feature.
Usage Guidelines
Use the following guidelines:
•When the network clocking configuration is present in the startup configuration, the clocking configuration is not applied until five minutes after the configuration has been parsed. This prevents clocking instability on the backplane when the interfaces/controllers come up out of order.
•Network clocking is enabled by default for the 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL.
•Cisco IOS Release 12.2(33)SRD1 does not support Ethernet Synchronization Message Channel (ESMC) on LAN PHY and SSM received from SONET/SDH frames for WAN PHY.
•If there is a clock source flap because of interface up and down events, there is an interval of 150 seconds before the source becomes valid and active.
•In the event of an Out-of-Range (OOR) switchover (revertive mode), but the interface stays up, the source switchover occurs when the clock offset crosses the +/-12 ppm threshold. If this occurs, you must reconfigure the source.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface TenGigabitEthernet slot/port
4. clock source {internal | line | loop}
5. exit
6. network-clock select priority interface TenGigabitEthernet slot/port
7. exit
Detailed Steps
To configure 10GE interface as the clock source, use the following commands.
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
interface TenGigabitEthernet slot/port
Example:
Router(config)# interface
tengigabitethernet 1/1
|
Specifies the Ten Gigabit Ethernet interface to configure, where:
•slot/port—Specifies the location of the interface.
|
Step 4
|
clock source {internal | line | loop}
Example:
Router(config-if)# clock source line
|
Select interface clock source type to ''Recover clock from line.'' This will make this interface eligible for system clock source selection.
|
Step 5
|
exit
Example:
Router(config-if)# exit
|
Exits interface configuration mode and returns to global configuration mode.
|
Step 6
|
network-clock select priority interface
TenGigabitEthernet slot/port
Example:
Router(config)# network-clock select 1
interface TenGigabitEthernet 1/1
|
Names a source to provide timing for the network clock and specifies the selection priority for this clock source.
|
Example
The following example shows how to configure 10GE interface as the clock source.
Router# configure terminal
Router(config)# interface tengigabitethernet 1/1
Router(config-if)# clock source line
Router(config)# network-clock select 1 interface TenGigabitEthernet 1/1
Verifying the Clock Source
Use the show network-clocks command to verify network clocking on the route processor (RP) side.
Router# show network-clocks
Active source = Slot 1 BITS 0
Active source backplane reference line = Secondary Backplane Clock
Standby source = TenGigabitEthernet1/1
Standby source backplane reference line = Primary Backplane Clock
(Standby source not driving backplane clock currently)
All Network Clock Configuration
---------------------------------
Priority Clock Source State Reason
1 POS3/0/1 Hardware not present
3 TenGigabitEthernet1/1 Valid
Current operating mode is Revertive
Current OOR Switchover mode is Switchover
There are no slots disabled from participating in network clocking
-------------------------
Slot Port Signal Type/Mode Line Build-Out Select
1 0 T1 D4 DSX-1 (133 to 266 feet)
Use the show platform hardware network-clocks command to verify output on the line card side.
Router-dfc# show platform hardware network-clocks
Port 1: N Port 2: N Port 3: N Port 4: N
Backplane Bus Status and Source:
Primary : Disabled, Port 0 RX_DEMAP Clock
Secondary : Enabled, BITS Rx Clock
BITS : Disabled, Port 0 RX_DEMAP Clock
ZL30138 Configuration and Status:
Mode of Operation : Automatic Normal
Ref0 Priority : 15 Ref1 Priority : 15
Ref2 Priority : 15 Ref3 Priority : 15
Ref4 Priority : 00 Ref5 Priority : 15
Ref6 Priority : 15 Ref7 Priority : 15
Reference Monitoring: Custom A frequency 25000 kHz
Ref# SCM CFM GST PFM Mode Detected
----------------------------------------------------------
0 0 0 0 0 CustA 38.88 MHz
1 1 1 1 1 CustA not detected
2 0 0 0 1 CustA 38.88 MHz
3 1 1 1 1 CustA not detected
5 1 1 1 1 Auto not detected
6 1 1 1 1 Auto not detected
BITS Configuration and Status:
Signal Type : T1 D4 Framing
Clock Divider : 1.544 MHz
Clock Source Recovery
For clock source recovery on the 76-ES+XT-2TG3CXL and 76-ES+XT-4TG3CXL, consider the following guidelines:
With BITS port as the clock source:
•Clock state shows "Hardware not present" if the line card is removed.
•Clock becomes "Validate but not present" if BITS Rx reports LOS, LOF, Blue Alarm (T1), or AIS (E1)
•If there are no BITS RX alarms, the clock state is "Valid."
With 10GE ports as the clock source:
•Clock state shows Hardware not present if the line card is removed.
•Clock becomes Validate but not present if the interface is down.
•If interface goes back up, the clock state is "Valid."
For both 10GE port clock recovery and BITS port clock recovery, when the clock source is recovered, the line card will send notification to the RP. Then after a 150-second debounce period, the RP sends a control message to every participant to synchronize with the valid clock source again.
Cisco 7600 Synchronous Ethernet
Synchronous Ethernet (SyncE) defined by the ITU-T standards such as G.8261 and G.8262 leverages the PHY layer of Ethernet to transmit clock information to the remote sites. SyncE over Ethernet provides a cost-effective alternative to the SONET networks. For SyncE to work, each network element along the synchronization path must support SyncE. To implement SyncE, the Bit clock of the Ethernet is aligned to a reliable clock traceable to Primary Reference Clock (PRC).
SyncE is implemented on an ES+ card for Cisco 7600 series routers. An ES+ card has a dedicated external interface known as BITs interface to recover clock from a Synchronization Supply Unit (SSU). The 7600 router uses this clock for SyncE. The BITS interface supports E1(European SSUs) and T1 (American BITS) framing. Table 12-1 lists the framing modes for BITS port on an ES+ card:
Table 12-1 Framing Modes for BITS Port on an ES+ card
BITS/SSU port support Matrix
|
Framing modes supported
|
Tx Port
|
Rx Port
|
T1
|
T1 ESF
|
Yes
|
Yes
|
T1
|
T1 SF
|
Yes
|
Yes
|
E1
|
E1 CRC4
|
Yes
|
Yes
|
E1
|
E1 FAS
|
Yes
|
Yes
|
E1
|
E1 CAS
|
No
|
Yes
|
E1
|
E1 CAS CRC4
|
No
|
Yes
|
You can implement SyncE on an ES+ card with four different configurations:
•Clock Recovery from SyncE: System clock is recovered from the SyncE clocking source (gigabit and ten gigabit interfaces only). Router uses this clock as the Tx clock for other SyncE interfaces or ATM/CEoP interfaces.
•Clock Recovery from External Interface: System clock is recovered from a BITS clocking source.
•Line to External: The clock received from an Ethernet is forwarded to an external SSU. The SynE feature provides the functionality for clock cleanup. For a router in the middle of synchronization chain, the received clock may have unacceptable wander and jitter. The router recovers the clock from the SyncE interface, converts it to the format required for the BITS interface, and sends to a SSU through the BITS port. The SSU performs the cleanup and sends it back to the BITs interface. The cleaned up clock is received back from the SSU. This clock is used as Tx clock for the SyncE ports. For 7600 router, the interface from which the clock is recovered and the BITS port to the SSU should reside on the same ES+ card.
•System to External: The system clock is used as Tx clock for an external interface. By default the system clock is not transmitted on the external interface.
The SyncE enabled ES+ line card provides the squelching functionality, where an Alarm indication Signal (AIS) is sent to the Tx interfaces if the clock source goes down. The squelching functionality is implemented in two cases:
•Line to external: If the line source goes down, an AIS is transmitted on the external interface to the SSU.
•System to external: If the router loses all the clock sources, an AIS is sent on the external interface to the SSU.
Squelching is performed only towards an external device such as SSU or PRC.
You can have a maximum of six clock sources for a 7600 Router and a maximum of 4 clock sources on an ES+ card. The clock source with highest priority is made the default clock source. You can manage the clock sources on an ES+ card by changing the priority of the clock sources. You can also manage the synchronization on ES+ cards using the following management options:
•Hold-of Time: If a clock source goes down, the router waits for a specific hold-off time before removing the source. By default, the value of hold-of time is 300 ms.
•Wait to Restore: If a SyncE interface comes up, the router waits for a specific period of time before considering the SyncE interface for synchronization source. By default, the value is 300 sec.
•Force Switch: Forcefully select a synchronization source irrespective of whether the source is available or within the specified range.
•Manual Switch: Forcefully select a synchronization source provided the source is available and within the range.
The ES+ is a family of fixed-port SyncE line cards supporting 20 and 40 Gbps bandwidth for the 7600 series routers. The following ES+ cards support SyncE:
•4x10G XFP ports (Longsword)
•40x1G SFP ports (Urumi),
• 2x10G XFP ports (Gladius),
• 20x1G SFP ports (Katar).
Restrictions and Usage Guidelines
Follow these restrictions and usage guidelines when configuring the SyncE on an ES40 line card:
•If the network clock algorithm is enabled, all the ES+ cards on the router use the system clock as Tx clock (synchronous mode) for its ethernet interfaces. You cannot change the synchronous mode on a per interface basis for the line card. The whole line cards functions in the same mode.
•On an ES+ card, you can have a maximum of 4 ports configured as clock source at a time.
•For a 20x1 gigabit ES+ line card, you can select a maximum of two ports from each NPU.
•For a 40x1 gigabit ES+ line card, you can select only one port from each NPU.
• No SSM / ESMC support on SyncE.
•You can configure a maximum of 6 ports as a clock source for a Cisco 7600 router.
• The line to external for clock clean up is supported only if the line interface and the external (BITS) interface are on the same ES+ line card.
• SyncE feature is SSO co-existent, but not compliant. The clock selection algorithm is restarted on a switchover. During the switchover the router goes into hold-over mode.
•You cannot implement the network-clock based clock selection algorithm and the new algorithm simultaneously. Both these algorithms are mutually exclusive.
Configuring Synchronous Ethernet on the Cisco 7600 Router with ES+ Line Card
This section describes how to configure SyncE for Cisco 7600 Router. SyncE is implemented on Cisco 7600 router using four different configurations:
•Configuring the Clock Recovery from SyncE
•Configuring the Clock Recovery from BITS Port
•Configuring the System to External
•Configuring the Line to External
Configuring the Clock Recovery from SyncE
This section describes how to configure SyncE over ES+ card on Cisco 7600 router using clock recovery from SyncE method.
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock synchronization automatic
4. network-clock synchronization ssm option option_Id Generation_Id
5. network-clock input-source priority {interface interface_name slot/card/port | {external slot/card/port }}
6. exit
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
network-clock synchronization automatic
Example:
Router(config)# network-clock synchro-
nization automatic
|
Enables the network clock selection algorithm. This command disables the Cisco specific network-clock process and turns on G.781 based automatic clock selection process.
|
Step 4
|
network-clock synchronization ssm op-
tion {option_id {GEN1 | GEN2}}
Example:
Router(config)#network-clock synchroni-
zation ssm option 2 GEN1
|
Configures the equipment to work in synchronization network. The option_id value 1 refers to synchronization networks design for Europe. This is the default value. The option_id value 2 refers to synchronization networks design for US.
|
Step 5
|
network-clock input-source priority
{interface interface_name
slot/card/port | {external
slot/card/port }}
Example:
Router(config-if-srv)#network-clock in-
put-source 1 interface
TenGigabitEthernet7/1
|
Enables clock recovery from SyncE.
|
Step 6
|
exit
Example:
Router(config)#exit
|
Exits the global configuration mode.
|
Examples
This example shows how to configure clock recovery from SyncE for Cisco 7600 Routers:
Router#configure terminal
Router(config)#network-clock synchronization automatic
Router(config)#network-clock synchronization ssm option 2 GEN1
Router(config)#network-clock input-source 1 interface TenGigabitEthernet7/1
Configuring the Clock Recovery from BITS Port
This section describes how to configure SyncE over ES+ card on Cisco 7600 router using clock recovery from BITS port.
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock synchronization automatic
4. network-clock synchronization ssm option option_Id Generation_Id
5. network-clock input-source priority {interface interface_name slot/card/port | {external slot/card/port }}
6. exit
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
network-clock synchronization automatic
Example:
Router(config)# network-clock synchro-
nization automatic
|
Enables the network clock selection algorithm. This command disables the Cisco specific network-clock process and turns on G.781 based automatic clock selection process.
|
Step 4
|
network-clock synchronization ssm op-
tion {option_id {GEN1 | GEN2}}
Example:
Router(config)#network-clock synchroni-
zation ssm option 2 GEN1
|
Configures the equipment to work in synchronization network. The option_id value 1 refers to synchronization networks design for Europe. This is the default value. The option_id value 2 refers to synchronization networks design for US.
|
Step 5
|
network-clock input-source priority
{interface interface_name
slot/card/port | {external
slot/card/port }}
Example:
Router(config-if-srv)#network-clock in-
put-source 1 External 7/0/0 t1 sf
|
Enables clock recovery from BITS port.
|
Step 6
|
exit
Example:
Router(config)#exit
|
Exits the global configuration mode
|
Examples
This example shows how to configure clock recovery from BITS port for Cisco 7600 Routers:
Router#configure terminal
Router(config)#network-clock synchronization automatic
Router(config)#network-clock synchronization ssm option 2 GEN1
Router(config)#network-clock input-source 1 External 7/0/0 t1 sf
Configuring the System to External
This section describes how to configure SyncE over ES+ card on Cisco 7600 router using System to External method.
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock synchronization automatic
4. network-clock synchronization ssm option option_Id Generation_Id
5. network-clock output-source system priority {external slot/card/port [j1 | 2m | 10m] }
6. exit
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
network-clock synchronization automatic
Example:
Router(config)# network-clock synchro-
nization automatic
|
Enables the network clock selection algorithm. This command disables the Cisco specific network-clock process and turns on G.781 based automatic clock selection process.
|
Step 4
|
network-clock synchronization ssm op-
tion {option_id {GEN1 | GEN2}}
Example:
Router(config)#network-clock synchroni-
zation ssm option 2 GEN1
|
Configures the equipment to work in synchronization network. The option_id value 1 refers to synchronization networks design for Europe. This is the default value. The option_id value 2 refers to synchronization networks design for US.
|
Step 5
|
network-clock output-source system pri-
ority {external slot/card/port [j1 | 2m
| 10m] }
Example:
Router(config)#network-clock out-
put-source system 1 external 4/0/0 t1
sf
|
Configures the system clock to be used on external Tx interfaces.
|
Step 6
|
exit
Example:
Router(config)#exit
|
Exits the global configuration mode.
|
Examples
This example shows how to configure system to external clocking for Cisco 7600 Routers:
Router#configure terminal
Router(config)#network-clock synchronization automatic
Router(config)#network-clock synchronization ssm option 2 GEN1
Router(config)#network-clock input-source 1 External 7/0/0 t1 sf
This example shows how to configure clock clean-up using an SSU:
Router(config)#network-clock output-source line 1 interface GigabitEthernet1/11 External
1/0/0 t1 sf
Router(config)#network-clock input-source 1 External 7/0/0 t1 sf
Configuring the Line to External
This section describes how to configure SyncE over ES+ card on Cisco 7600 router using Line to External method.
SUMMARY STEPS
1. enable
2. configure terminal
3. network-clock synchronization automatic
4. network-clock synchronization ssm option option_Id Generation_Id: Sets the SSM option
5. network-clock output-source line priority {interface interface_name | controller {t1 | e1} slot/card/port}} {external slot/card/port}
6. exit
DETAILED STEPS
| |
Command
|
Purpose
|
Step 1
|
enable
Example:
|
Enables privileged EXEC mode.
•Enter your password if prompted.
|
Step 2
|
configure terminal
Example:
Router# configure terminal
|
Enters global configuration mode.
|
Step 3
|
network-clock synchronization automatic
Example:
Router(config)# network-clock synchro-
nization automatic
|
Enables the network clock selection algorithm. This command disables the Cisco specific network-clock process and turns on G.781 based automatic clock selection process.
|
Step 4
|
network-clock synchronization ssm op-
tion {option_id {GEN1 | GEN2}}
Example:
Router(config)#network-clock synchroni-
zation ssm option 2 GEN1
|
Configures the equipment to work in synchronization network. The option_id value 1 refers to synchronization networks design for Europe. This is the default value. The option_id value 2 refers to synchronization networks design for US.
|
Step 5
|
network-clock output-source line prior-
ity {interface interface_name | con-
troller {t1 | e1} slot/card/port}}
{external slot/card/port}
Example:
Router(config-if-srv)#encapsulation
dot1q 40 second-dot1q 42
|
Configures the line clock to be used on external Tx interfaces.
|
Step 6
|
exit
Example:
Router(config)#exit
|
Exits the global configuration mode.
|
Examples
This example shows how to configure clock recovery from SyncE for Cisco 7600 Routers:
Router#configure terminal
Router(config)#network-clock synchronization automatic
Router(config)#network-clock synchronization ssm option 2 GEN1
Router(config)#network-clock input-source 1 interface TenGigabitEthernet7/1
Router(config)#network-clock output-source line 1 interface GigabitEthernet1/11 External
1/0/0
Managing Synchronization on ES+ Card
You can manage the synchronization on ES+ cards using the following management CLIs:
•Wait to Restore: Use the network-clock wait-to-restore timer global command to set wait-to-restore time. You can configure the wait to restore time between 0-86400 sec. The default value is 300 sec. The wait to restore timer can be set at global configuration mode and interface configuration mode. The following example shows how to configure wait to restore timer at global configuration mode:
Router(config)#network-clock wait-to-restore 10 global
The following example shows how to configure wait to restore timer at interface configuration mode:
Router(config)#int ten 7/1
Router(config-if)#network-clock wait-to-restore 10
•Hold-off Time: Use network-clock hold-off timer global command to configure hold-off time. You can configure the hold-off time to zero or any value between 50-10000. The default value is 300 ms. The following example shows how to configure hold-off time:
Router(config)#network-clock hold-off 50 global
•Force Switch: Use network-clock switch force {interface interface_name slot/sub-slot/port | external slot/sub-slot/port} command to forcefully select a synchronization source irrespective of whether the source is available and within the range. The following example shows how to configure manual switch:
Router(config)#network-clock switch force interface tenGigabitEthernet 7/1 t1
•Manual Switch: Use network-clock switch manual {interface interface_name slot/sub-slot/port | external slot/sub-slot/port} command to manually select a synchronization source provided the source is available and within the range. The following example shows how to configure manual switch:
Router(config)#network-clock switch manual interface tenGigabitEthernet 7/1 t1
•Clear Manual and Force Switch: Use the network-clock clear switch controller-id command to clear the manual or force switch. The following example shows how to clear a switch:
Router(config)#network-clock clear switch t0
•Lock-out a Source: Use the network-clock set lockout {interface interface_name slot/card/port | external slot/card/port command to lock-out a clock source. A clock source flagged as lock-out is not considered for by selection process for SyncE. To clear the lock-out on a source, use network-clock clear lockout {interface interface_name slot/card/port | external slot/card/port command. The following example shows how to lock-out a clock source:
Router(config)#network-clock set lockout interface tenGigabitEthernet 7/1
The following example shows how to clear lock-out on a clock source:
Router(config)#network-clock clear lockout interface tenGigabitEthernet 7/1
Verification
Use the following commands to verify the MTP configuration:
•You can use the show network-clocks synchronization command to view brief SyncE configuration:
Router#show network-clocks synchronization
Symbols: En - Enable, Dis - Disable, Adis - Admin Disable
* - Synchronization source selected
# - Synchronization source force selected
& - Synchronization source manually switched
Automatic selection process : Enable
Equipment Clock : 2048 (EEC-Option1)
T0 : TenGigabitEthernet7/1
Hold-off (global) : 50 ms
Wait-to-restore (global) : 10 sec
Interface SigType Mode/QL Prio QL_IN ESMC Tx ESMC Rx
Internal NA NA/Dis 251 NA Dis Dis
*Te7/1 NA Sync/Dis 1 NA Dis Dis
AT8/1/0 NA NA/Dis 1 NA Dis Dis
SONET 9/0/0 NA NA/Dis 1 NA Dis Dis
•You can use show network-clocks synchronization detail command to view detailed SyncE configuration:
Router#show network-clocks synchronization detail
Symbols: En - Enable, Dis - Disable, Adis - Admin Disable
* - Synchronization source selected
# - Synchronization source force selected
& - Synchronization source manually switched
Automatic selection process : Enable
Equipment Clock : 2048 (EEC-Option1)
T0 : TenGigabitEthernet7/1
Hold-off (global) : 50 ms
Wait-to-restore (global) : 10 sec
Number of synchronization sources: 3
sm(netsync_ql_dis NETCLK_QL_DISABLE), running yes, state 2A
Last transition recorded: (begin)-> 2A (src_rem)-> 2A
Interface SigType Mode/QL Prio QL_IN ESMC Tx ESMC Rx
Internal NA NA/Dis 251 NA Dis Dis
*Te7/1 NA Sync/Dis 1 NA Dis Dis
AT8/1/0 NA NA/Dis 1 NA Dis Dis
SONET 9/0/0 NA NA/Dis 1 NA Dis Dis
---------------------------------------------
Local Interface: Internal
QL Receive Configured: NA
QL Transmit Configured: NA
Mode: Synchronous(Ql-disabled)
QL Receive Configured: NA
QL Transmit Configured: NA
Slot Disabled: FALSE
