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# Platform Considerations

Procedures for managing modules vary depending on the type of E Series router that you have. The following sections describe the types of modules that you can manage for each type of E Series router and the general software procedures associated with them.

## ERX7xx Models, ERX14xx Models, and the ERX310 Broadband Services Router

You can manage line modules, I/O modules, and SRP modules on ERX7xx models, ERX14xx models, and the ERX310 router. For more information about these modules, see the ERX Module Guide.

For information about upgrading software on SRP modules, see Installing JUNOSe Software . For information about related procedures and installing modules, see ERX Hardware Guide, Chapter 4, Installing Modules.

### Line Modules and I/O Modules

Most line modules available with these E Series models pair with a corresponding I/O module; however, some line modules do not require a corresponding I/O module. For example, the Service Module (SM) does not have a corresponding I/O module.

By configuring the performance line rate for a line module in the Juniper Networks ERX705 , ERX710, and ERX1410 Broadband Services Routers, you can enable the line modules either to operate at full line rate performance or to allow line modules to operate at a rate dependent on the resources available. For more information, see Configuring Performance Rate of Line Modules on ERX7xx Models and the ERX1410 Router.

The Juniper Networks ERX1440 Broadband Services Router has two turbo slots (numbered 2 and 4). You can install certain line modules in the turbo slots to achieve greater line rate performance than when the modules are installed in other slots. For more information, see JUNOSe Physical Layer Configuration Guide.

Redundancy is supported for some line modules on these models. For more information, see Line Module Redundancy.

For more information about interface types and specifiers for ERX7xx models, ERX14xx models, and the ERX310 router, see Interface Types and Specifiers in JUNOSe Command Reference Guide.

### SRP Modules

If you want to configure the performance line rate for a line module on supported routers, you must consider the bandwidth requirements of the SRP module that is installed on the router. For more information, see Configuring Performance Rate of Line Modules on ERX7xx Models and the ERX1410 Router .

Redundancy is supported for SRP modules on certain E Series routers; for more information, see SRP Module Redundancy.

SRP modules have a corresponding SRP I/O module that contains a Fast Ethernet management port. You can configure this port to access the router from a Telnet session or SNMP. For more information, see Managing the Ethernet Port on the SRP Module .

For information about using high availability mode for stateful SRP switchover, see Managing Modules.

## E120 and E320 Broadband Services Routers

You can manage line modules, SRP modules, SFMs, and IOAs on the E120 and E320 routers. For more information about these modules, see the E120 and E320 Module Guide.

For information about related procedures and installing modules, see E120 and E320 Hardware Guide, Chapter 4, Installing Modules. For information about upgrading software on SRP modules, see the E120 and E320 Hardware Guide.

### Line Modules and IOAs

Line modules on the E120 and E320 routers act as frameforwarding engines for the physical interfaces, which are the IOAs.

You cannot configure the performance line rate of line modules for E120 and E320 Routers. Redundancy is supported for line modules on this router. For more information, see Line Module Redundancy.

On the E120 router, line modules can be installed in slots 0–5. On the E320 router, line modules can be installed in slots 0–5 and 11–16. Both the E120 and E320 routers have two turbo slots, numbered 2 and 4. When a line module is installed in a turbo slot, it spans slots 2–3 and 4–5. The bandwidth of slot 3 or slot 5 is used for a line module in slot 2 or slot 4 if that line module requires the turbo slot.

| Note: If a line module is installed in slot 3 or slot 5, and the line module in slot 2 or 4 requires bandwidth, the system configures the line module it detects first. The state of the other line module is displayed in show version command output as disabled (cfg error).

The 100 Gbps switch fabric that is available with the SRP 100 on the E320 router allocates 3.4 Gbps of overall bandwidth to each regular line module slot and 10 Gbps of overall bandwidth to each of the turbo slots. With a 100 Gbps fabric configuration, you must install the ES2 10G Uplink LM in the turbo slots. For more information, see JUNOSe Physical Layer Configuration Guide.

The 120 Gbps switch fabric on the E120 router allocates 10 Gbps of overall bandwidth to each line module slot. Similarly, the 320 Gbps switch fabric on the E320 router allocates 10 Gbps of overall bandwidth to each line module slot. For both configurations, you can install any line module in any of the slots.

A line module on the E120 and E320 routers can accommodate one full-height IOA or up to two half-height IOAs per slot. In the software, adapter 0 identifies the right IOA bay (E120 router) and the upper IOA bay (E320 router); adapter 1 identifies the left IOA bay (E120 router) and the lower IOA bay (E320 router).

You can configure the slot by using the command-line interface (CLI), as well as the individual IOAs. For example, if you want to disable the line module installed in slot 3, issue the slot disable 3 command. If you want to disable the IOA in the upper bay or left bay of slot 3, issue the adapter disable 3/0 command. Table 37 lists the IOA bay values that you use to manage half-height and full-height IOAs.

For some IOAs, issuing the adapter disable 3/0 command reboots the line module. Modules that support hot-swapping enable you to remove and add an IOA in a slot without rebooting the line module. If the slot is populated with another active IOA, it continues to operate.

Depending on the IOA type, you can manage IOAs from certain slots or bays. Table 37 lists the IOA management information, including valid IOA combinations and hot-swapping support.

Table 37: IOA Management Information

IOA | Right Bay (E120) Upper Bay (E320) (Adapter 0) | Left Bay (E120) Lower Bay (E320) (Adapter 1) | Both Bays Concurrently | Combined with Other IOAs in Same Slot | Hot-Swapping Support
--- | --- | --- | --- | --- | ---
ES2-S1 GE-4 | Yes | Yes | No | No | Yes
ES2-S1 GE-8 | Yes | Yes | Yes | Yes (GE-8 when paired with ES2 4G LM or ES2 10G LM; GE-8, OC3/STM1, and OC12/STM4 IOAs when paired with ES2 4G LM) | Yes
ES2-S3 GE-20 | Yes (Full-height IOA) | Not applicable | Not applicable | Not applicable | No
ES2-S1 10GE | Yes (Full-height IOA) | Not applicable | Not applicable | Not applicable | No
ES2-S2 10GE PR | Yes (Full-height IOA) | Not applicable | Not applicable | Not applicable | No
ES2-S1 OC3-8 STM1 ATM | Yes | Yes | Yes | Yes (GE-8, OC3/STM1, and OC12/STM4 IOAs only) | Yes
ES2-S1 OC12-2 STM4 ATM | Yes | Yes | Yes | Yes (GE-8, OC3/STM1, and OC12/STM4 IOAs only) | Yes
ES2-S1 OC12-2 STM4 POS | Yes | Yes | Yes | Yes (GE-8, OC3/STM1, and OC12/STM4 IOAs only) | Yes
ES2-S1 OC48 STM16 POS | Yes | Yes | No | No | Yes
ES2-S1 Service | Yes (Full-height IOA) | Not applicable | Not applicable | Not applicable | No
ES2-S1 Redund | Yes (Full-height IOA; slots 0 and 11 only) | Not applicable | Not applicable | Not applicable | No
ES2-SRP IOA | Yes | Yes | Not applicable | Not applicable | Yes

For more information about interface types and specifiers for the E120 and E320 routers, see Interface Types and Specifiers in JUNOSe Command Reference Guide.

### SRP Modules and SFMs

The router accommodates up to two SRP modules and three SFMs that act as an integrated system controller (SC) and switch fabric system. The SC is located on the SRP modules; the router’s switch fabric is distributed between the SRP modules and SFMs. The switch fabric is divided into fabric slices; each SRP module and SFM has a resident fabric slice. At least four of the five possible fabric slices must be installed for the E120 and the E320 routers to operate.

You can configure the E120 router with a 320 Gbps fabric by installing SRP 120 modules and SFM 120 modules, or SRP 320 modules and SFM 320 modules.

You can configure the E320 router with a 100 Gbps fabric by installing SRP 100 modules and SFM 100 modules. To achieve increased switch fabric capacity and speed, you can configure the E320 router with a 320 Gbps fabric by installing SRP 320 modules and SFM 320 modules.

You can configure the SC and the fabric slices on the SRP modules separately. For example, if you disable the fabric slice on the standby SRP module by using the slot disable 7 fabric command, the SC on that SRP module is still enabled.

Redundancy is supported for SRP modules on the E120 and E320 routers. For more information, see SRP Module Redundancy.

SRP modules on the E120 and E320 routers have two slots for flash cards; other E Series routers have only a single slot. Cards installed in the second slot can be used only for core dump (.dmp) files. For more information, see Managing Flash Cards on SRP Modules.

SRP modules on the E120 and E320 routers have a corresponding SRP IOA that contains a Fast Ethernet management port. You can configure this port to access the router from the CLI or SNMP. For more information, see Managing the Ethernet Port on the SRP Module .

For information about using high availability mode for stateful SRP switchover, see Managing Modules.

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