User manual JUNIPER NETWORKS JUNOS NETWORK OPERATION GUIDE REV1

[. . . ] JUNOSTM Internet Software for M-series and T-series Routing Platforms Network Operations Guide Hardware Juniper Networks, Inc. 1194 North Mathilda Avenue Sunnyvale, CA 94089 USA 408-745-2000 www. juniper. net Part Number: 530-012090-01, Revision 1 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. This product includes FreeBSD software developed by the University of California, Berkeley, and its contributors. [. . . ] The M40e and M160 router fuses are located in a fuse box at the rear of the midplane, behind the lower rear impeller assembly. You must remove the lower impeller assembly to access the fuses, as described in the appropriate router hardware guide. When the fuse for an MCS blows, the MCS stops functioning even though it is installed correctly and the power supplies are providing power to the router. For the M40e and M160 routers, when a fuse has blown but the power supplies are still delivering power to router, the amber LED adjacent to the fuse lights. See Figure 151. Figure 151: M40e M160 Router Fuses J243 ABCD MCS0 12A SFM0 10A FPC7 15A FPC6 15A J242 15A 10A 12A 10A FPC5 SFM1 MCS1 SFM3 J244 SPARE 1A SPARE 10A SPARE 12A SPARE 15A J241 SFM2 FPC4 PCG1 FPC3 10A 15A 1A 15A ABCD ABCD ABCD J240 FPC2 FPC1 FPC0 PCG0 15A 15A 15A 1A A B C D 1238 Another indication that a fuse has blown is that the colored indicator bulb inside it becomes visible through the clear cover on the fuse. For information about the indicator bulb color for each fuse type, see the appropriate router hardware guide. A blown fuse can cause a component to fail even though it is correctly installed and the power supplies are functioning. ! The LED that indicates normal operation for the component fails to light. The appropriate CLI show chassis environment command indicates that the component is installed but is not receiving power. Verifying MCS Failure ! 365 JUNOS Internet Software Network Operations Guide: Hardware Step 2: Perform an MCS Swap Test The MCS can fail and not start, or it can cause a connectivity problem between the Routing Engine and the Packet Forwarding Engine components, such as the Flexible PIC Concentrator (FPC) and Switching and Forwarding Module (SFM). You can perform a swap test on the MCS to try to pinpoint the problem. CAUTION: The MCS is hot-pluggable. You should perform a swap test during a maintenance window. Before performing a swap test, always check for bent pins in the midplane and check the MCS for stuck pins in the connector. Pins stuck in the component connector can damage other good slots during a swap test. Action To perform a swap test on an MCS, remove it and replace it with one that you know works. Normally, if two host modules are installed in the router, HOST0 functions as the master and HOST1 as the backup. You can remove the backup host module (or either of its components) without interrupting the functioning of the router. If you take the master host module offline, the router reboots and the backup host module becomes the master. If the router has only one host module, taking it offline causes the router to shut down. Before you replace the Routing Engine or an MCS, you must take the host module offline; the host module is hot-pluggable. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the Routing Engine. Attach an electrostatic discharge (ESD) strap to your bare wrist and connect the strap to one of the ESD points on the chassis. Remove the rear component cover by loosening the screws at the corners of the cover and pulling it straight off of the chassis. If two host modules are installed, check whether the MCS you are removing belongs to the master host module. Use the show chassis environment mcs CLI command or check the MCS LEDs. [. . . ] 36 Simple Network Management Protocol See SNMP Small Form Factor Pluggables See SFPs SNMP agent, description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 MIB, description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 trap, description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 software, router shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]