Avici Systems Inc.

Field Replacement Procedure

SSR Server Module

02131-03 Rev. AA

This procedure is for replacing or installing a SSR server module. Before beginning this procedure, carefully inspect the package to ensure no damage occurred during shipping or delivery. If you suspect any possible damage to any field replacement unit, contact Customer Service immediately.

Tools Needed

You will need a 1/2-inch flat-head screwdriver.

Support Services

To obtain information on customer service and training, there are three ways to contact Avici Customer Service:

Server Modules

The SSR offers two servers, the primary (active) and secondary (passive) server. The SSR only accepts a "green" server. A green server is identified by the green diamond located at the top of the module. For a list of the available server types and the units they apply to, refer to Table 1.

NOTE An SSR only accepts a green server. Do not try to insert a red server, blue server, or red triangle server into an SSR. All servers are the same, except for the outer enclosure.

Table 1. Avici Server Modules
Type SSR Series II TSR

Red server

--

--

Yes

Blue server

--

--

Yes

Red triangle server

--

Yes

Yes

Green server

Yes

--

--

Primary and Secondary Servers

Each green server provides a 300 Mhz PowerPC 604e CPU, 576 Mbytes of memory (64 Mb on the baseboard and 512 Mb of add-on PMC memory), and 32Kbytes of NVRAM for maintaining configuration and 8 Mbytes of flash for software images.

The green server also supports five 10/100BaseT Ethernet ports and one DB-9 console port connection.

Each green server resides in a module enclosure together with a power conversion card and persistent file storage.

Physically identical to the primary server, the passive server is designed and implemented to take over in the event the primary server becomes unusable. The servers connect to the bay controllers via the server connector panel. The server's ETH 3 and ETH 4 ports connect to the server connector panel and these connections lead to an Ethernet repeater located on the bay controllers. This repeater allows the bay controller and servers to look like one logical LAN.

Refer to Figure 1 for a logical view of the server connector panel and its connections.

Figure 1. SSR Server Connections via ETH 3/ETH 4 (first heartbeat)

The primary and secondary servers contain two heartbeat connections for redundancy. The ETH 3 and ETH 4 multicast connections are required to form the first peering session. The first heartbeat is a multicast message over the bay controller network. The second heartbeat is over the server's ETH 0 port and this unicast connection requires an external network. The two heartbeats ETH 3/ETH 4 and ETH 0 work in unison and begin as soon as you have established an active/backup pair also known as "final" state.

NOTE The server's ETH 0 port provides a redundant warm stand-by connection between the servers in the event the primary warm server communication path via ETH 3 and ETH 4 goes down.

If a server stops receiving heartbeats (multicast or unicast) a trap will be immediately sent (within one second) stating that the communication (primary or secondary) is no longer available. After four minutes of non-connection to the other server via both paths, the server will send a trap notifying that the server is gone and the central office critical alarm is activated. The central office alarm is based on loss of communication with the bay controller. Since every server must register with the bay controller (and constantly update itself with the bay controllers, servers must see each other (since it is the same physical link/protocol). Warm stand-by relies on the bay controller to create the central office alarm if a server goes down. After 5 minutes of no communication on both paths, the backup server will assume the active role.

For server software configuration details, refer to the IPriori CLI Reference (Vol. 1). When configuring the servers, keep in mind that the server configured with the lowest ID number will be the active or primary server.

SSR Module Population Rules

Each SSR chassis has two shelves numbered 1 (top) and 2 (bottom). Each shelf has 11 slots to house the router and server modules. Each shelf can house one server module and 10 router modules. The server modules can only be placed in the left most slot on each shelf, slots (S1 and S2). The router modules occupy slots 1-10 and 11-20. All router modules must be inserted in pairs.

SSR Chassis Shelf and Slot Numbering

The two shelves and their slots are illustrated in Figure 2.

Figure 2. SSR Chassis Shelf and Slot Numbering

Module Orientation

Slots in the SSR only accept red router modules and a green server.

NOTE The SSR will not accept any blue labeled modules.

The module color label is located on the top side of the module and on each shelf.

Populating The First Chassis

The rules for populating the first SSR chassis with module pairs are as follows:

Populating The Second Chassis

The population rules for the second chassis are the same as for the first.

Server Attached Modules

In each SSR, the server attaches to one or two router modules known as Server-Attached Modules (SAMs). The power receptacle on the server module plugs directly into three power pins on the inside of the system near the backplane and does not plug into a module slot in the backplane.

Removal of the server module is detected by the SAM module after the SAM attempts to communicate with the server and receives no response. The SAMs act as intermediaries by providing access to all router modules. It is necessary to re-cable the connection to the SAM when replacing the server. When removing a server module you must do a controlled shut down. Refer to IPriori Software Configuration Guide (Vol.1) for information about removing a module.

NOTE You may choose any two modules to act as your SAM modules. For maximum fault tolerance, we recommend that the primary and backup SAM module be on different shelves for power redundancy and separate columns for communications.

Removing the Server Module

Prior to removing the server module take note of the position of the interface cables on the module enclosure faceplate and the color of the label located on the top of the server module. The label color (green only) indicates which module can be inserted into a particular slot in the shelf. If you have a server module with the wrong indicator mark, call Support Services.

CAUTION (1) Within five minutes of removal of a module, a replacement module or a filler module must be installed in the empty slot.

PROCEDURE: Use the following steps to remove the server module from the SSR bay shelf:

Step 1 Push on the server module where instructed. The server door opens and displays the module cable connections. Refer to Figure 3 and Figure 4.

Figure 3. Server Module Door

Step 2 Record the Ethernet and console cable connections for each port on a piece of paper.

Step 3 Disconnect the cables from the interface ports on the module faceplate. Refer to Figure 4.

Figure 4. Server Module Faceplate

Step 4 Using a 1/2-inch flat-blade screwdriver, turn the two captive screws on the server faceplate counter clockwise to loosen. The server module lock latch releases.

Step 5 Carefully pull the server module straight out to release it from the backplane and remove it from the shelf. Refer to Figure 5.

Figure 5. Server Module Removal

Step 6 Place the removed server module in the static-proof bag.

Installing the Server Module

PROCEDURE: Use the following procedure to install the server module:

Step 1 Remove the server module from its static-proof bag.

Step 2 Check that the door of the server module is closed. If the door is open, close it.

Figure 6. Server Module Faceplate

Step 3 Check the color indicator on the top of the module to determine if it is the right type for this slot (green only). If it is not the correct color, contact Support Services. Refer to Figure 7.

Figure 7. Server Module Color Indicator

Step 4 Position the metal tabs of the lock latch release levers under the lip of the server.

Step 5 Align the module with the card guides of the slot and slide the server module into the slot. Refer to Figure 8.

.

Figure 8. Server Module Installation

Step 6 Using a 1/2-inch flat-blade screwdriver, turn the captive screws on the server faceplate clockwise to tighten, continuing to turn carefully until screw rotation is no longer possible. This ensures full engagement. The server module locks into place.

Installing Server Module Cables

Each server module supports five Ethernet ports (ETH 0-4) and one female console (DB-9) port. The Ethernet ports provide for interconnection to other modules within the bay and to the network management system. The console port provides for interconnection to a console terminal for use when configuring via the CLI.

Redundant Bay Controllers

The SSR offers fault tolerance via a connection from both the primary and secondary server's ETH 3 and ETH 4 ports to the bay controller network on the server connector panel.

These server connector ports can be found below each shelf, with ports located in the middle. These ports are BC 1-1 and BC 2-1 (on first shelf) and BC 1-2 and BC 2-2 (on second shelf). Refer to Figure 9.

Figure 9. Server Connector Ports (lower shelf)

To further illustrate the recommended SSR connections on the server connector ports for the primary and secondary servers, please refer to Figure 10. This logical view borrows from Figure 9 and depicts the recommend port hook ups for the primary server in slot S1 (BC 1-1 and BC 2-1) and for the secondary server in slot S2 (BC 1-2 and BC 2-2). The dotted lines illustrate the connections between each of the server connector panel ports to the bay controllers.

Figure 10. Recommended Server Connector Port Connections

Each server connects to the server connector panel located under its shelf.

SSR Chassis Configuration

The server module in the SSR attaches to two router modules, also called Server-Attached Modules (SAMs). The server must be installed in position S1 or S2. Any router module can serve as a SAM. The dual SAM system provides system redundancy.

NOTE You may choose any two modules to act as your SAM modules. For maximum fault tolerance, we recommend that the primary and backup SAM module be on different shelves for power redundancy and separate columns for communications.

PROCEDURE: Use the following steps to install the Ethernet and console cables for the server modules. Refer to Figure 11 for an illustration of the cables and connectors described in these procedures.

Figure 11. Server Module Cable Connections

Step 1 ETH 0 - Attach an RJ-45 Ethernet cable from this connector on the server module to the remote network management system within the central office.

Step 2 CONSOLE - Attach a female DB-9 RJ-45 adapter from this connector on the server module to one end of the UTP cable with RJ-45 connectors on each end. Take the RJ-45 connector on the other end of the UTP cable and plug it into the female adapter, which can plug into a console terminal (PC) port, or connection of your choice.

Step 3 ETH 1 - Attach an RJ-45 Ethernet cable from this connector on the server module to the RJ-45 connector located in the AUX tray of any other router module. (Slide out the AUX tray to make the connection.) This router module is the primary SAM. Refer to Figure 12.

NOTE You may choose any two modules to act as your SAM modules. For maximum fault tolerance, we recommend that the primary and backup SAM module be on different shelves for power redundancy and separate columns for communications.

Step 4 ETH 2 - Attach an RJ-45 Ethernet cable from this connector on the server to the RJ-45 connector located in the AUX tray of any other router module. Slide out the AUX tray to make the connection.

This router module is referred to as the secondary SAM. Refer to Figure 12.

Figure 12. RJ-45 Ethernet Cable Connection

Step 5 ETH 3 - Attach the RJ-45 Ethernet cable from the server module to the server connector panel port BC 1-1). Each of the four server connector ports is connected internally to the bay controller.

Step 6 ETH 4 - Attach the RJ-45 Ethernet cable from the server module to the server connector port BC 2-1). Each of the four server connector panel ports is connected internally to the bay controller.

Figure 13. Server Panel Ethernet Connections (lower shelf)

Step 7 For a warm stand-by server, repeat Step 5 and Step 6 to connect the secondary server to BC 1-2 and BC 2-2.

Copyright © 2001 Avici Systems Inc.
Avici® and TSR® are registered trademarks of Avici Systems Inc.
IPriori™ is a trademark of Avici Systems Inc.

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