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This chapter describes how to hot swap some Cisco 3660 router components. Topics included:
 | Caution Not all Cisco 3660 router components are hot swappable. Only hot swap components described in this chapter. |
| Caution Cisco 3620 and 3640 routers do not have any hot-swappable components. |
The Cisco 3660 router can accommodate two AC or two DC power supplies (PS1 and PS2) in bays at the rear of the unit (see Figure 5-1). Each unit provides up to 250 Watts of power, and a single installed power supply meets the router's requirements. The second installed power supply provides redundancy, load sharing, and increased system availability. It can be removed without affecting system operation.
 | Warning Do not touch the power supply when the power cord is connected. For systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. For systems without a power switch, line voltages are present within the power supply when the power cord is connected. |
Use the following procedure to remove a power supply:
Step 1 Identify the failed power supply by checking the power supply LEDs (PS1 and PS2) on the router's front panel. (For an explanation of power supply LEDs, see Table A-3.)
Step 2 Facing the rear panel, identify the failed power supply by checking the bay (PS1 or PS2) that it is installed in, and checking that the LED on the power supply is orange or off. (See Figure 5-1 for the location of the power supply LED.)
Step 3 Turn OFF power to the failed power supply and unplug the power cable.
Step 4 Loosen the two captive screws holding the power supply in the chassis bay, using the Phillips or flat-blade screwdriver. (See Figure 5-1.)
Step 5 Slide the power supply out of the bay. (See Figure 5-1.)
Install a replacement power supply as described in the "Installing a Power Supply" section that follows. If you are not planning to install a power supply at this time, see the "Power Supply Filler Panel" section.
Use the following procedure to install a power supply:
Step 1 Check that the power switch on the power supply is in the OFF position.
Step 2 Align the power supply with the chassis bay, and slide it in until the center hole (between the captive screws) is aligned with the hole in the bay's lower shelf. (See Figure 5-1.)
Step 3 Tighten the two captive screws that secure the power supply in the chassis bay, using the Phillips or flat-blade screwdriver. (See Figure 5-1.)
Step 4 Connect the power cord to the replacement power supply.
Step 5 Turn ON power to the replacement power supply.
Step 6 Check that the LED on the power supply is green. (See Figure 5-1 for the location of the power supply LED.)
Step 7 Check that the power supply LED (PS1 or PS2) on the front panel is green. (For an explanation of power supply LEDs, see Table A-3.)
If your router has only one power supply installed, install a power supply filler panel (with two screws) in the vacant bay. The filler panel ensures proper airflow.
| Warning The plug-socket combination must be accessible at all times because it serves as the main disconnecting device. |
| Caution Never operate the router unless the unit is completely closed to ensure adequate cooling. |
Take the following steps to power on the router:
Step 1 For routers with AC input, plug the router's power cord into a three-terminal, single-phase power source that provides power within the acceptable range. (See the "Power Supply Considerations" section.)
Step 2 Power ON the router. The LED labeled SYSTEM on the front panel should
light up.
If you encounter problems when you power on the router, see the Appendix A, "Troubleshooting."
The Cisco 3660 router allows you to replace similar network modules without powering off the system or affecting the operation of other interfaces. This provides seamless operation to end users on the network, maintains all routing information, and ensures session preservation.
| Caution Do not hot swap WAN interface cards and voice interface cards in the network modules. Doing so will damage the cards and network modules. |
| Caution Cisco 3660 routers support hot swapping with similar modules only. If you remove a 4-Port Ethernet module, install another 4-Port Ethernet module in its place. |
Slot numbers in the Cisco 3660 router are shown in Figure 5-3. These slots correspond to the Active and Ready LEDs (0/0, 0/1, and 1 through 6) on the front bezel. Each individual network interface is identified by an interface type followed by a slot number and a unit number.
| Caution Do not hot swap the Fast Ethernet connections at 0/0 and 0/1. |
Unit numbers identify the interfaces on the modules and WAN interface cards installed in the router. Unit numbers begin at 0 for each interface type, and continue from right to left and from bottom to top. Modules and WAN interface cards are identified by:
interface type chassis slot/ unit number
For example: Ethernet 1/0.
Voice interfaces are numbered differently from WAN interfaces in that they consist of:
interface type chassis slot/voice module slot/voice interface unit number
For example: Voice 3/1/0
Slot numbers remain unchanged regardless of whether other network modules are installed or removed. However, when you move a network module to a different slot, the unit number changes to reflect the new slot number.
In order to access the network modules, loosen the two captive screws securing the chassis shield to the router. (See Figure 5-4.)
Informational and error messages may be displayed during this procedure. For a description of these messages, see the "Cisco 3660 Error Messages" section.
| Caution Complete all steps (removing and installing) of the hot-swapping procedure for one network module before attempting to hot swap another installed network module. |
Use the following procedure to remove a network module:
Step 1 From the global configuration mode, enter the interface configuration mode, and shut down each interface on the network module. (For information on configuration commands, see the publication Software Configuration Guide.)
Router (config)# interface ethernet 1/0 Router (config-if)# shutdown
For information on the interfaces in this network module, use the show interfaces command.
Step 2 Repeat Step 1 of this procedure for every interface on the network module.
Step 3 Unplug all network interface cables connected to the network module.
Step 4 Loosen the two captive screws holding the network module in the chassis slot. (See Figure 5-5.)
Step 5 Slide the network module out of the slot. (See Figure 5-5.)
Install a replacement (similar) network module as described in the "Installing a Network Module" section that follows. If you are not planning to install a network module at this time, see the "Network Module Filler Panel" section.
Informational and error messages may be displayed during this procedure. For a description of these messages, see the "Cisco 3660 Error Messages" section.
Use the following procedure to install a network module:
Step 1 Align the replacement network module with the guides in the chassis slot and slide it gently into the slot. (See Figure 5-5.)
Step 2 Push the module into place until you feel its edge connector mate securely with the connector on the backplane.
Step 3 Tighten the two captive screws that secure the network module in the chassis slot, using the Phillips or flat-blade screwdriver. (See Figure 5-5.)
Step 4 Reconnect the network interface cables previously removed in Step 3 of the "Removing a Network Module" section.
Step 5 Check that the network module LEDs light up, and that the Active/Ready LEDs on the front panel also light up. (For an explanation of network module LEDs see the publication, Cisco Network Modules Hardware Installation Guide; for an explanation of Active/Ready LEDs, see Table A-4.)
Step 6 From the global configuration mode, enter the interface configuration mode, and activate each interface on the network module. (For information on configuration commands, see the publication Software Configuration Guide.)
Router (config)# interface ethernet 1/0 Router (config-if)# no shutdown
For information on the interfaces in this network module, use the show interfaces command.
Step 7 Repeat Step 6 of this procedure for every interface on the network module.
If the router is not fully configured with network modules, install filler panels in the vacant chassis slots to ensure proper airflow. (See Figure 5-6.)
When you have finished replacing network modules, replace the chassis shield as described:
Step 1 Align the chassis shield with the rear panel of the router. (See Figure 5-4.)
Step 2 Secure the louvered chassis shield by tightening the two captive screws at the side of the shield. (See Figure 5-4.)
Step 3 Reinstall network cables.
Step 4 If necessary, remove one or more of the cable panels on the chassis shield (see Figure 5-7), and route cables through this opening.
This prevents the cables from being bent or stressed by the chassis shield.
The Cisco 3660 router fan cage maintains acceptable operating temperatures within the router. If higher temperatures are detected or a fan failure warning message is received, you might need to replace the fan cage. (Refer to the "Cisco 3660 Error Messages" section.)
Use the following procedure to remove the bezel and fan cage:
Step 1 Facing the front of the router, locate the two screw covers on the bezel's right edge. (See part 1 in Figure 5-8.)
Step 2 Using a Phillips screwdriver, loosen the two captive screws.
(See part 2 in Figure 5-8.)
Step 3 Swing out the bezel/fan cage assembly (to approximately 85 degrees), and lift it slightly to disengage it from the chassis tab slots. (See parts 1 and 2 in Figure 5-9.)
| Caution Do not swing the bezel/fan cage assembly more than 90 degrees out from the chassis. Doing so will bend the tabs and prevent correct installation of the bezel/fan cage assembly. |
Step 4 Separate the bezel/fan cage assembly from the chassis. (See part 3 in Figure 5-9.)
| Caution Do not operate the router for an extended length of time with the fan cage removed. The resulting out-of-range operating temperatures could affect router operation. |
Step 1 Close the bezel screw covers. (See Figure 5-8.)
Step 2 Place the bezel/fan cage assembly (bezel side down) on a flat surface.
Step 3 Using the Torx screwdriver, remove the Torx screw securing the bezel to the fan cage. (See part 1 in Figure 5-10.)
Step 4 Slide the fan cage in the direction of its tabbed edge, and lift it away from the bezel. (See part 2 in Figure 5-10.)
Step 1 Place the bezel (face down) on a flat surface.
Step 2 Position the fan cage (fan side up) on the bezel. (See Figure 5-10.)
Make sure that the fan cage lays flat on the bezel; the tabbed edge of the fan cage will extend slightly beyond the bezel's edge.
Step 3 Slide the fan cage away from the tabbed edge so that all sides are aligned.
(See part 2 in Figure 5-10.)
Step 4 Replace the Torx screw securing the bezel to the fan cage.
(See part 1 in Figure 5-10.)
Step 1 Facing the front of the router, align the tabbed edge of the bezel/fan cage assembly with the chassis tab slots (see part 3 in Figure 5-9), and push down slightly to engage the tabs (see part 2 in Figure 5-9).
Step 2 Swing the bezel/fan cage assembly into the chassis. (See part 1 in Figure 5-9.)
Step 3 Locate the two screw covers on the bezel's right edge. (See part 1 in Figure 5-8.)
Step 4 Using a Phillips screwdriver, tighten the two captive screws and close the screw covers. (See part 2 in Figure 5-8.)
Posted: Tue Nov 30 15:38:21 PST 1999
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