Replacing an MX240 SCB

Before replacing an SCB, read the guidelines in Operating and Positioning the MX240 SCB Ejectors.

1. Removing an MX240 SCB
2. Installing an MX240 SCB
3. Upgrading an MX240 Switch Control Board

Removing an MX240 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.

1. Take the host subsystem offline.
2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
4. Rotate the ejector handles simultaneously counterclockwise to unseat the SCB.
5. Grasp the ejector handles, and slide the SCB about halfway out of the chassis.
6. Place one hand underneath the SCB to support it, and slide it completely out of the chassis.
7. Place the SCB on the antistatic mat.
8. If you are not replacing the SCB now, install a blank panel over the empty slot.

Figure 1: Removing an SCB

Installing an MX240 SCB

1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
2. Carefully align the sides of the SCB with the guides inside the chassis.
3. Slide the SCB into the chassis until you feel resistance, carefully ensuring that it is correctly aligned.
4. Grasp both ejector handles, and rotate them simultaneously clockwise until the SCB is fully seated.
5. Place the ejector handles in the proper position, horizontally and toward the center of the board.
6. 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.
7. Check the status of the SCB using the show chassis environment cb command:
   user@host> show chassis environment cb

   CB 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 MX240 Switch Control Board

1. Preparing for the Upgrade
2. Upgrading the First SCB
3. Upgrading the Second SCB
4. 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 MX240 router for the Enhanced MX Switch Control Board (SCB) upgrade:

1. 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 version

   Model: mx240 
   Junos Base OS Software Suite [11.3-20110530];
   

   Note: The Enhanced MX SCB is supported only in Junos Release 11.4 or later.

   The latest software ensures a healthy system—that is—Routing Engines, control boards, and FPCs, before the upgrade.

2. Verify that MX SCB boards are installed by issuing the show chassis hardware command.
   user@host> show chassis hardware

   Item 	Version 	Part Number	Serial Number	Description 
   CB0 	REV 07	710-021523	ABBC8281		MX SCB
   CB1 	REV 07	710-021523	ABBC8323		MX SCB	
   	

   SCB details are displayed as above, along with other hardware components. The MX240 router has only two SCBs, and each SCB has four fabric planes.

3. 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.
4. 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.
5. Set the upgrade flag on, and start the SCB upgrade by issuing the set chassis state cb-upgrade on command.
   user@host# set chassis state cb-upgrade on

   user@host# configure

   user@host# commit
6. Determine the order to replace the existing SCBs with upgraded ones. SCB0 is associated with RE0 and SCB1 is associated with RE1.

   Note: Do not add or remove any router hardware during the upgrade procedure.

Upgrading the First SCB

Tip: MX240 has two slots for SCB—that is, SCB0 and SCB1—and these correspond to RE0 and RE1, respectively, where SCB1 is the first SCB.

To upgrade the first SCB, that is, SCB1:

1. Take the fabric plane offline by issuing the request chassis fabric plane 4 offline command. SCB1 has four fabric planes numbered, 4, 5, 6, and 7.
2. Verify that the fabric plane is offline by issuing the show chassis fabric summary command.
   user@host> show chassis fabric summary

   Plane		State		Uptime
     4		Offline
     5		Online		1 hour, 15 minutes, 35 seconds			

   Verify that the 'State’ of Plane 4 is Offline.

3. Take the remaining fabric planes offline by issuing the request chassis fabric plane 5/6/7 offline command—that is, by changing the fabric plane number each time. Verify that the fabric planes are offline by issuing the command given in Step 2.
4. Take the SCB in slot 1 offline by issuing the request chassis cb offline slot 1 command.
5. Verify that the control board is offline by issuing the show chassis environment cb 1 command:
   user@host> show chassis environment cb 1

   CB 1 status:
   State		Offline
   Power 1		Disabled
   Power 2		Disabled

6. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
7. Remove and replace SCB1 on the router with the enhanced SCB. Use the replacement procedure described inRemoving an MX240 SCB.
8. 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 1

   CB 1 status
   State		Online
   Temperature	30 degrees C / 86 degrees F

   Other details, such as power, are also displayed, along with the state.

9. Verify that the fabric planes come online correctly by issuing the show chassis fabric summary command:
   user@host> show chassis fabric summary

   Plane	 State	Uptime
   4	Online	2 minutes, 25 seconds	
   5	Online	2 minutes, 15 seconds
   6	Online	2 minutes, 3 seconds
   7	Online	1 minute, 49 seconds

10. Verify the alarms by issuing the show chassis alarms command:
    user@host> show chassis alarms

    Alarm Time 		Class	Description
    2011-06-01 13:26:56 EDT	Major	CB fabrics are of mixed types

    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 Second SCB

1. Power down the second Routing Engine from the first Routing Engine by issuing the request system power-off other-routing-engine command.
2. Ensure that the Routing Engine is powered down by issuing the show chassis routing-engine 0 command.
   user@host> show chassis routing-engine 0

   Routing Engine Status:
   Slot 0:
   Current State 	Present				

   Verify that the Current State is Present, which indicates that the Routing Engine is offline.

3. Take the first fabric plane of the backup Routing Engine offline by issuing the request chassis fabric plane 0 offline command. SCB0 has four fabric planes numbered, 0, 1, 2, and 3.
4. Verify that the fabric plane is offline by issuing the show chassis fabric summary command.
   user@host> show chassis fabric summary

   Plane	State	Uptime
   0	Offline
   1 	Online 3 minutes, 45 seconds
   

   Verify that the State of plane 0 is Offline.

5. Take the remaining fabric planes offline by issuing the request chassis fabric plane 1/2/3 offline command—that is, by changing the fabric plane number each time. Verify that the fabric planes are offline by issuing the command given in Step 4.
6. Take the SCB in slot 0 offline by issuing the request chassis cb offline slot 0 command.
7. Verify that the control board is offline by issuing the show chassis environment cb 0 command:
   user@host> show chassis environment cb 0

   CB 0 status:
   State		Offline
   Power 1		Disabled
   Power 2		Disabled

8. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
9. Remove and replace the offline SCB on the router with the enhanced SCB. Use the replacement procedure described in Removing an MX240 SCB.
10. Verify that the installation is successful and SCB0 is online by issuing the show chassis environment cb 0 command:
    user@host> show chassis environment cb 0

    CB 0 status
    State		Online
    Temperature	30 degrees C / 86 degrees F

    Other details such as power are also displayed along with the state.

11. Verify that the fabric planes come online correctly by issuing the show chassis fabric summary command:
    user@host> show chassis fabric summary

    Plane	State	Uptime
    0	Online	2 minutes, 5 seconds	
    1	Online	1 minute, 55 seconds
    2	Online	1 minute, 43 seconds
    3	Online	1 minute, 33 seconds

12. Verify that the second Routing Engine is back online by issuing the show chassis routing-engine 0 command:
    user@host> show chassis routing-engine 0

    Routing Engine Status:
    Slot 0:
    Current State		Backup

Completing the SCB Upgrade

1. 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 info

   Slot	State
   0	Upgrade not supported
   1	Needs upgrade
   2	Empty
   3	Empty	
   4	Empty
   5	Empty

   The results indicate that slot 0 does not support the upgrade and slot 1 needs to be upgraded.

2. 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, because it does not consider any redundancy or graceful switchover strategies that you may have configured on the system.

3. Upgrade the MPC in slot 1 by running the request chassis fabric upgrade-bandwidth fpc slot 1 command.
4. Verify that the MPC is upgraded by issuing the request chassis fabric upgrade-bandwidth info command:
   user@host> request chassis fabric upgrade-bandwidth info

   Slot	State
   0	Upgrade not supported
   1	Upgraded
   2	Empty	

5. Verify the state of the fabric planes for all MPCs by issuing the show chassis fabric summary command.
   user@host> show chassis fabric summary

   Plane	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

6. Verify the state of the MPCs by issuing the show chassis fabric fpcs command.
   user@host> show chassis fabric fpcs

   FPC 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.

7. Verify that the major alarms are displayed by issuing the show chassis alarms command:
   user@host> show chassis alarms

   Alarm 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.

8. Disable the upgrade configuration by issuing the set chassis state cb-upgrade off command and then the commit command.
9. You can delete that command by issuing the delete chassis state cb-upgrade command and then the commit command.
10. Verify the SCBs before you finish by issuing the show chassis hardware command:
    user@host> show chassis hardware

    Item 	Version 	Part Number	Serial Number	Description 
    CB0 	REV 02	750-031391	YE8505		Enhanced MX SCB
    CB1 	REV 07	710-031391	YL6769		Enhanced MX SCB	
    	

    You can see that the MX240 now has enhanced SCBs.