User manual JUNIPER NETWORKS T640

[. . . ] T640 Core Router Hardware Guide Published: 2010-10-28 Copyright © 2010, Juniper Networks, Inc. Juniper Networks, Inc. 1194 North Mathilda Avenue Sunnyvale, California 94089 USA 408-745-2000 www. juniper. net This product includes the Envoy SNMP Engine, developed by Epilogue Technology, an Integrated Systems Company. This program and its documentation were developed at private expense, and no part of them is in the public domain. This product includes memory allocation software developed by Mark Moraes, copyright © 1988, 1989, 1993, University of Toronto. [. . . ] Grasping the craft interface by the top and bottom edges, press it into place. Tighten the screws at the corners of the craft interface. NOTE: When you install the craft interface in an operating router, allow several minutes for the LEDs on the craft interface to reflect the current state of the router. After you install the replacement craft interface, immediately reinstall the upper front fan tray. Copyright © 2010, Juniper Networks, Inc. 197 T640 Core Router Hardware Guide Figure 100: Installing a Replacement Craft Interface Related Documentation · · · · T640 Craft Interface Description on page 41 T640 Craft Interface LCD and Navigation Buttons on page 43 Troubleshooting Using the T640 Craft Interface LEDs T640 Preventing Electrostatic Discharge Damage on page 306 Replacing the T640 Host Subsystem Components To replace a routing engine or control board: 1. Taking the T640 Host Subsystem Offline on page 198 2. Replacing a T640 Routing Engine on page 206 Taking the T640 Host Subsystem Offline The host subsystem is taken offline and brought online as a unit. Before you replace a T-CB or Routing Engine, you must take the host subsystem offline. Normally, if two host subsystems are installed in the T640 router, RE0 functions as the master and RE1 functions as the backup. You can remove the backup host subsystem (or either of its components) without interrupting the functioning of the router. If you take the master host subsystem offline, the backup host subsystem becomes the master (the router might reboot, depending on your configuration). If the router has only one host subsystem, taking the host subsystem offline causes the router to shut down. Table 33 on page 199 explains the effect of taking the host subsystem offline. 198 Copyright © 2010, Juniper Networks, Inc. Chapter 17: Replacing T640 Router Hardware Components Table 33: Effect of Taking the Host Subsystem Offline Type of Host Subsystem Nonredundant host subsystem Backup host subsystem Effect of Taking the Host Subsystem Offline The router shuts down. The functioning of the router is not interrupted. Removal or failure of the master Routing Engine affects forwarding and routing based on the high availability configuration: · Master host subsystem Dual Routing Engines without any high availability features enabled--Traffic is interrupted while the Packet Forwarding Engine is reinitialized. When the switchover to the new master Routing Engine is complete, routing convergence takes place and traffic is resumed. Graceful Routing Engine switchover (GRES) is enabled--Graceful Routing Engine switchover preserves interface and kernel information. However, graceful Routing Engine switchover does not preserve the control plane. Neighboring routers detect that the router has restarted and react to the event in a manner prescribed by individual routing protocol specifications. To preserve routing without interruption during a switchover, graceful Routing Engine switchover must be combined with nonstop active routing. Nonstop active routing is enabled (graceful Routing Engine switchover must be configured for nonstop active routing to be enabled)--Nonstop active routing supports Routing Engine switchover without alerting peer nodes that a change has occurred. Nonstop active routing uses the same infrastructure as graceful Routing Engine switchover to preserve interface and kernel information. However, nonstop active routing also preserves routing information and protocol sessions by running the routing protocol process (rpd) on both Routing Engines. In addition, nonstop active routing preserves TCP connections maintained in the kernel. Graceful restart is configured--Graceful restart provides extensions to routing protocols so that neighboring helper routers restore routing information to a restarting router. These extensions signal neighboring routers about the graceful restart and prevent the neighbors from reacting to the router restart and from propagating the change in state to the network during the graceful restart period. Neighbors provide the routing information that enables the restarting router to stop and restart routing protocols without causing network reconvergence. [. . . ] Pack the router or component for shipment. Related Documentation · · · · T640 Router Description on page 3 T640 Chassis Description on page 13 Locating T640 Component Serial Numbers Using the CLI on page 369 Packing the T640 Router for Shipment on page 379 Tools and Parts Required to Remove Components from a T640 Router To remove components from the router or the router from a rack, you need the following tools and parts: · · · · · · · · · · 2. 5-mm flat-blade (­) screwdriver, for detaching alarm relay terminal block 7/16-in. (11 mm) nut driver Blank panels to cover empty slots Electrostatic bag or antistatic mat, for each component Electrostatic discharge (ESD) grounding wrist strap Flat-blade (­) screwdriver Mechanical lift, if available Phillips (+) screwdrivers, numbers 1 and 2 Rubber safety cap for fiber-optic interfaces or cable Wire cutters 378 Copyright © 2010, Juniper Networks, Inc. Appendix G: Contacting Customer Support and Returning T640 Router Hardware Related Documentation · · · T640 Router Description on page 3 T640 Chassis Description on page 13 Locating T640 Component Serial Numbers Using the CLI on page 369 Packing the T640 Router for Shipment To pack the router for shipment: 1. Retrieve the shipping crate and packing materials in which the router was originally shipped. If you do not have these materials, contact your Juniper Networks representative about approved packaging materials. 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. 3. [. . . ]