Technical Documentation
Replacing an MX960 SCB
Before replacing an SCB, read the guidelines in Operating and Positioning the MX960 SCB Ejectors.
Removing an MX960 SCB
To remove an SCB (see Figure 1):
 | Note: You can remove the SCB and Routing Engine as a unit, or remove the Routing Engine separately. |
 | Caution: Before removing an SCB, ensure that you know how to operate the ejector handles properly to avoid damage to the equipment. |
| Caution: Before you replace an SCB, you must take the host subsystem offline. If there is only one host subsystem, taking the host subsystem offline shuts down the router. |
- Take the host subsystem offline.
- Place an electrostatic bag or antistatic mat on a flat, stable surface.
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Rotate the ejector handles simultaneously counterclockwise to unseat the SCB.
- Grasp the ejector handles, and slide the SCB about halfway out of the chassis.
- Place one hand underneath the SCB to support it, and slide it completely out of the chassis.
- Place the SCB on the antistatic mat.
- If you are not replacing the SCB now, install a blank panel over the empty slot.
Figure 1: Removing an SCB
Installing an MX960 SCB
To install an SCB (see Figure 2):
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Carefully align the sides of the SCB with the guides inside the chassis.
- Slide the SCB into the chassis until you feel resistance, carefully ensuring that it is correctly aligned.
- Grasp both ejector handles, and rotate them simultaneously clockwise until the SCB is fully seated.
- Place the ejector handles in the proper position, vertically and toward the center of the board.
- Check the LEDs on the SCB faceplate to verify that
it is functioning normally.
- The green OK/FAIL LED should light steadily a few minutes after the SCB is installed.
- If the OK/FAIL LED is red, remove and install the SCB again. If the OK/FAIL LED still lights steadily, the SCB is not functioning properly. Contact your customer support representative.
- Check the status of
the SCB using the show chassis environment cb command:
user@host> show chassis environment cbCB 0 status: State Online Master Temperature 25 degrees C / 77 degrees F Power 1 1.2 V 1198 mV 1.5 V 1508 mV 1.8 V 1830 mV 2.5 V 5059 mV 3.3 V 6593 mV 5.0 V 5111 mV 12.0 V 12181 mV 1.25 V 1250 mV 3.3 V SM3 6587 mV 5 V RE 5078 mV 12 V RE 12026 mV Power 2 11.3 V bias PEM 11253 mV 4.6 V bias MidPlane 4827 mV 11.3 V bias FPD 11408 mV 11.3 V bias POE 0 11446 mV 11.3 V bias POE 1 11408 mV Bus Revision 6 FPGA Revision 0 CB 1 status: State Online Standby Temperature 26 degrees C / 78 degrees F Power 1 1.2 V 1211 mV 1.5 V 1517 mV 1.8 V 1817 mV 2.5 V 2507 mV 3.3 V 3312 mV 5.0 V 5136 mV 12.0 V 12142 mV 1.25 V 1260 mV 3.3 V SM3 3306 mV 5 V RE 5085 mV 12 V RE 11968 mV Power 2 11.3 V bias PEM 11369 mV 4.6 V bias MidPlane 4814 mV 11.3 V bias FPD 11427 mV 11.3 V bias POE 0 11350 mV 11.3 V bias POE 1 11330 mV Bus Revision 39 FPGA Revision 1
Figure 2: Installing an SCB
Upgrading an MX960 SCB
- Preparing for the Upgrade
- Upgrading the First SCB
- Upgrading the SCB in the Backup Routing Engine
- Upgrading the SCB in the Master Routing Engine
- Completing the SCB Upgrade
Preparing for the Upgrade
| Note: Do not make other changes to the CLI during the entire upgrade process. You can ensure that you will not make such changes by opening a telnet session to the master RE CLI operational mode and issuing the configure exclusive command. This command locks the configuration procedure. |
 | Tip: To prevent traffic loss during the upgrade process, we recommend that you operate the line cards at 50% line rate. This 50% limit must be maintained per PFE on each line card. |
To prepare the MX960 router for the Enhanced MX Switch Control Board (SCB) upgrade:
- Verify that the system runs Junos OS Release 11.4 or later
by issuing the show version command on
the master router.
user@host> show versionModel: mx960 Junos Base OS Software Suite [11.3-20110530];
Note: The Enhanced MX SCB is supported only in Junos OS Release 11.3 or later.
The latest software ensures a healthy system—that is, Routing Engines, control boards, and FPCs—before the upgrade.
- Verify that MX SCB boards are installed by issuing the show chassis hardware command.
user@host> show chassis hardwareItem Version Part Number Serial Number Description
CB0 REV 07 710-021523 ABBC8281 MX SCB CB1 REV 07 710-021523 ABBC8323 MX SCB CB2 REV 07 710-021523 ABBD1410 MX SCBSCB details are displayed as above, along with other hardware components.
- Establish console connections to both Routing Engines. You can use a telnet session to connect to the router console by issuing the <router name>-con command. For example, if the router name is juniper, you can connect to RE0 and RE1 consoles by issuing the telnet juniper-con and telnet juniper1-con commands.
- Ensure that graceful switchover (GRES), commit synchronize
(required for nonstop routing), and nonstop routing (NSR) are enabled
or configured by running the set chassis redundancy graceful-switchover,
set system commit synchronize, set routing-options nonstop-routing commands.
Note: These commands are mandatory for this upgrade and may be removed, if desired, after the upgrade.
- Set the upgrade flag on and start the SCB upgrade by issuing
the set chassis state cb-upgrade on command.
user@host# configureuser@host# set chassis state cb-upgrade onuser@host# commit - Determine the order to replace the existing SCBs with
upgraded ones. SCB 0, 1, and 2 are available for the MX960. SCB 0
is associated with RE0, SCB1 is associated with RE1, and ; SCB 2 is
the spare SCB. The SCB order for MX960 is SCB2, SCB1 (backup Routing
Engine slot), and SCB0 (Master Routing Engine slot).
Note: Do not add or remove any router hardware during the upgrade procedure.
Upgrading the First SCB
To upgrade the first SCB—that is—SCB2:
- Take the fabric plane offline by issuing the request chassis fabric plane 4 offline command.
- Verify that the fabric plane is offline by issuing the show chassis fabric summary command.
user@host> show chassis fabric summaryPlane State Uptime 4 Offline 5 Online 1 hour, 15 minutes, 35 seconds
Verify that the State of Plane 4 is Offline.
- Take the next fabric plane offline by issuing the request chassis fabric plane 5 offline command, and then verify that the fabric plane is offline by issuing the command given in Step 2.
- Take the SCB in slot 2 offline by issuing the request chassis cb offline slot 2 command.
- Verify that the control board is offline by issuing the show chassis environment cb 2 command:
user@host> show chassis environment cb 2CB 2 status: State Offline Power 1 Disabled Power 2 Disabled
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Remove and replace SCB2 on the router with the enhanced SCB.
- Verify that the installation is successful and the SCB
is online by issuing the show chassis environment cb 2 command:
user@host> show chassis environment cb 2CB 2 status State Online Temperature 30 degrees C / 86 degrees F
Other details, such as, power are also displayed along with the state.
- Verify that the fabric planes come online correctly by
issuing the show chassis fabric summary command:
user@host> show chassis fabric summaryPlane State Uptime 4 Online 2 minutes, 25 seconds 5 Online 2 minutes, 15 seconds
- Verify the alarms by issuing the show chassis alarms command:
user@host> show chassis alarmsAlarm Time Class Description 2011-06-01 13:26:56 EDT Major CB fabrics are of mixed types 2011-06-01 12:10:41 EDT Major Require a fan tray upgrade
Because only one SCB has been upgraded, the alarm indicates that the SCBs are of mixed type. This alarm is cleared after all the control boards are upgraded.
Upgrading the SCB in the Backup Routing Engine
To upgrade the SCB in the backup Routing Engine:
- Power down the backup Routing Engine from the master Routing Engine by issuing the request system power-off other-routing-engine command.
- Ensure that the Routing Engine is powered down by issuing
the show chassis routing-engine 1 command. The slot of the
Routing Engine may be 0 or 1, and is shown as 1 in this example:
user@host> show chassis routing-engine 1Routing Engine Status: Slot 1: Current State Present
Verify that the Current State is Present, which indicates that the Routing Engine is offline.
- Take the first fabric plane of the backup Routing Engine offline by issuing the request chassis fabric plane 3 offline command.
- Verify that the fabric plane is offline by issuing the show chassis fabric summary command.
user@host> show chassis fabric summaryPlane State Uptime 2 Online 3 minutes, 45 seconds 3 Offline
Check if the State of Plane 3 is Offline.
- Take the next fabric plane offline by issuing the request chassis fabric plane 2 offline command and verify that the fabric plane is offline by issuing the command in Step 4.
- Take the SCB in slot 1 offline by issuing the request chassis cb offline slot 1 command.
- Verify that the SCB is offline by issuing the show
chassis environment cb 1 command:
user@host> show chassis environment cb 1CB 1 status: State Offline Power 1 Disabled Power 2 Disabled
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Remove and replace the offline SCB on the router with the enhanced SCB.
- Verify that the installation is successful and the SCB
is online by issuing the show chassis environment cb 1 command:
user@host> show chassis environment cb 1CB 1 status State Online Temperature 30 degrees C / 86 degrees F
Other details, such as power, are also displayed along with the state.
- Verify that the fabric planes 2 and 3 come online correctly
by issuing the show chassis fabric summary command:
user@host> show chassis fabric summaryPlane State Uptime 2 Online 2 minutes, 5 seconds 3 Online 1 minutes, 55 seconds
- Verify that the backup routing engine is back online by
issuing the show chassis routing-engine 1 command:
user@host> show chassis routing-engine 1Routing Engine Status: Slot 1: Current State Backup
Upgrading the SCB in the Master Routing Engine
To upgrade the SCB in the master Routing Engine slot:
- Switch mastership between the backup Routing Engine and master Routing Engine by issuing the request chassis routing-engine master switch command. Now the backup Routing Engine becomes the master Routing Engine.
- Log in to the new master Routing Engine after the switchover.
- Switch the configuration mode to ensure that you are still in configure exclusive mode by issuing the exit command and then the configure exclusive command, from the old master Routing Engine.
- Log in to the current master Routing Engine again and issue the configure exclusive command.
- Power down the backup Routing Engine from the master Routing Engine by issuing the request system power-off other-routing-engine command.
- Ensure that the Routing Engine is powered down by issuing
the show chassis routing-engine 0 command. The slot of the
Routing Engine may be 0 or 1, and is shown as 1 in this example:
user@host> show chassis routing-engine 1Routing Engine Status: Slot 0: Current State Present
Verify that the Current State is Present, which indicates that the Routing Engine is offline or powered down.
- Take the first fabric plane of the backup Routing Engine offline by issuing the request chassis fabric plane offline 1 command.
- Verify that the fabric plane is offline by issuing the show chassis fabric summary command.
user@host> show chassis fabric summaryPlane State Uptime 1 Offline 2 Online 3 minutes, 25 seconds
Verify that the State of Plane 1 is Offline.
- Take the next fabric plane offline by issuing the request chassis fabric plane offline 0 command and verify that the fabric plane is offline by issuing the command given in Step 2.
- Take the SCB in slot 0 offline by issuing the request chassis cb offline slot 0 command.
- Verify that the control board is offline by issuing the show chassis environment cb 0 command:
user@host> show chassis environment cb 0CB 0 status: State Offline Power 1 Disabled Power 2 Disabled
- Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
- Remove and replace the offline SCB on the router with the enhanced SCB.
- Verify that the installation is successful and the SCB
is online by issuing the show chassis environment cb 0 command:
user@host> show chassis environment cb 0CB 0 status State Online Temperature 30 degrees C / 86 degrees F
Other details, such as power, are also displayed, along with the state.
- Verify that the fabric planes 0 and 1 come online correctly
by issuing the show chassis fabric summary command:
user@host> show chassis fabric summaryPlane State Uptime 0 Online 2 minutes, 9 seconds 1 Online 2 minutes, 2 seconds
- Verify the alarms by issuing the show chassis alarms command:
user@host> show chassis alarmsAlarm Time Class Description 2011-06-01 13:26:56 EDT Major CB fabric links require upgrade/training 2011-06-01 12:10:41 EDT Major Require a fan tray upgrade
The “major” alarm has now changed from “CB fabrics are of mixed types” to “CB fabric links require upgrade/training.” This is because there is a switch control board that requires training to change links from 3G speed to 6G speed of the enhanced SCB. This alarm is displayed until the 3G to 6G link transition is completed.
Completing the SCB Upgrade
To complete the procedure after upgrading the SCBs:
- Verify that any Modular Port Concentrator (MPC) is running
at 3G instead of 6G by issuing the request chassis fabric upgrade-bandwidth
info command:
user@host> request chassis fabric upgrade-bandwidth infoSlot State 0 Upgrade not supported 1 Upgraded 2 Empty 3 Empty 4 Empty 5 Empty 6 Empty 7 Empty
The results indicate that slot 0 does not support the upgrade and slot 1 needs upgrade.
- Upgrade the bandwidth of all MPCs by issuing the request
chassis fabric upgrade-bandwidth fpc all command. If you want
to control the MPC line card upgrade, go to Step 3.
Caution: Use this command only if you are not concerned with the slot upgrade order or if only one old MPC is present in the chassis. Running this command may result in a loss of traffic across that MPC. Using this method may increase that loss, as it does not consider any redundancy or graceful switchover strategies that you may have configured on the system.
- Upgrade the MPC in slot 1 by running the request chassis fabric upgrade-bandwidth fpc slot 1 command.
- Verify that the MPC is upgraded by issuing the request
chassis fabric upgrade-bandwidth info command:
user@host> request chassis fabric upgrade-bandwidth infoSlot State 0 Upgrade not supported 1 Upgraded 2 Empty
- Verify the state of fabric planes for all MPCs by issuing
the show chassis fabric summary command.
user@host> show chassis fabric summaryPlane State Uptime 0 Spare 21 seconds 1 Spare 12 seconds 2 Online 12 minutes 3 Online 12 minutes 4 Online 30 minutes 5 Online 30 minutes
- Verify the state of MPCs by issuing the show chassis
fabric fpcs command.
user@host> show chassis fabric fpcsFPC 1 PFE #0 Plane 0: Links ok Plane 1: Links ok Plane 2: Plane enabled Plane 3: Plane enabled Plane 4: Plane enabled Plane 5: Plane enabled PFE #1 Plane 0: Links ok Plane 1: Links ok Plane 2: Plane enabled Plane 3: Plane enabled Plane 4: Plane enabled Plane 5: Plane enabled PFE #2 Plane 0: Links ok Plane 1: Links ok Plane 2: Plane enabled Plane 3: Plane enabled Plane 4: Plane enabled Plane 5: Plane enabled PFE #3 Plane 0: Links ok Plane 1: Links ok Plane 2: Plane enabled Plane 3: Plane enabled Plane 4: Plane enabled Plane 5: Plane enabled
Fabric plane details of all MPCs are similarly displayed.
- Verify that the major alarms are displayed by issuing
the show chassis alarms command:
user@host> show chassis alarmsAlarm Time Class Description 2011-06-01 13:37:43 EDT Minor Require a fan tray upgrade 2011-06-01 13:37:26 EDT Minor Backup RE Active
The major alarms are not displayed anymore, and the upgrade is successfully completed.
- Disable the upgrade configuration by issuing the set chassis state cb-upgrade off command and then the commit command.
- You can delete that command by issuing the delete chassis state cb-upgrade command and then the commit command.
- Verify the SCBs before you finish by issuing the show
chassis hardware command:
user@host> show chassis hardwareItem Version Part Number Serial Number Description
CB0 REV 02 750-031391 YE8505 Enhanced MX SCB CB1 REV 07 710-031391 YL6769 Enhanced MX SCB CB2 REV 07 710-031391 YE8492 Enhanced MX SCBYou can see that the MX960 now has enhanced SCBs.
