SM-X-6X1G – 6x1G GE/SFP – SM-X Service Module – ISR 4000 WAN

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SM-X-6X1G Description

The SM-X-6X1G is a Cisco 6-port Gigabit Ethernet routed WAN service module for Cisco 4000 Series ISRs with an SM-X slot. The module has six dual-mode GE/SFP ports that run as Layer 3 interfaces, in a single-wide form factor of 40 x 206 x 207 mm. The module does not switch Layer 2 traffic between its ports and does not supply PoE.

Quick Specs

Parameter

Specification

Product ID

SM-X-6X1G

Product type

6-port high-density Gigabit Ethernet WAN service module

Cisco ordering description

6-port Gigabit Ethernet, dual-mode GE/SFP, SM-X Module

Form factor

Single-wide Enhanced Service Module (SM-X)

Port profile

Six 1GE routing ports

Media options

Dual-mode GE/SFP

Layer operation

Routed Layer 3 ports

On-module Layer 2 switching

Not supported

Power over Ethernet

Not supported

Cisco 4000 series ISR support

Platforms with an SM-X slot

Physical size

1.57 x 8.11 x 8.15 in. (40 x 206 x 207 mm)

Connection media

Dual-mode GE/SFP

Input packet classification

Supported on the module

Application Scenarios

Multi-Circuit Branch Edge

A branch router that terminates several 1G internet and WAN circuits gets six routed ports from one SM-X slot, with fiber circuits on SFP and copper circuits on RJ45.

Routed Handoff To Switches

In a data room, the module’s routed ports connect to external switches and terminate their Layer 2 trunks, so routing stays on the ISR and not on the switch.

Product Comparison

Parameter

SM-X-6X1G

SM-X-4X1G-1X10G

NIM-2GE-CU-SFP

NIM-1GE-CU-SFP

Form factor

SM-X

SM-X

NIM

NIM

Ports

Six Gigabit Ethernet dual-mode GE/SFP

Four Gigabit Ethernet dual-mode GE/SFP or one 10G SFP+

Two Gigabit Ethernet dual-mode GE/SFP

One Gigabit Ethernet dual-mode GE/SFP

Cisco 4000 series ISR support

Platforms with an SM-X slot

Platforms with an SM-X slot

Cisco 4321, 4331, 4351, 4431, 4451 and 4461

All Cisco 4000 Series ISRs

Power over Ethernet

No

No

No

No

MACsec

No

No

256-bit

No

Input packet classification on module

Yes

Yes

No

No

On-module Layer 2 switching

Not supported

Not supported

Not supported

Not supported

SM-X-6X1G provides six dual-mode GE/SFP routed ports in an SM-X slot, while SM-X-4X1G-1X10G offers either four GE/SFP ports or one 10G SFP+ port, and using the 10G port disables the other ports. A 10G circuit therefore needs SM-X-4X1G-1X10G. Routers with only NIM slots take NIM-2GE-CU-SFP with two ports or NIM-1GE-CU-SFP with one port, and NIM-1GE-CU-SFP is the only one of the four that fits all Cisco 4000 Series ISRs. Of the four, only NIM-2GE-CU-SFP lists 256-bit MACsec, and only the two SM-X modules classify input packets on the module. None of them supplies PoE.

Ordering Checklist

  • ISR 4000 hosts with an SM-X slot: Confirm the router is a Cisco ISR 4321, 4331, 4351, 4451 or 4461 with a free SM-X slot. The module fits an SM-X slot, not a NIM slot.

Specifications

Parameter Specification Parameter Specification
Product ID SM-X-6X1G Product type 6-port high-density Gigabit Ethernet WAN service module
Cisco ordering description 6-port Gigabit Ethernet, dual-mode GE/SFP, SM-X Module Ordering form SM-X-6X1G(=)
Form factor Single-wide Enhanced Service Module (SM-X) Port profile Six 1GE routing ports
Connection media Dual-mode GE/SFP Layer operation Routed Layer 3 ports
On-module Layer 2 switching Not supported Power over Ethernet Not supported
Cisco 4000 series ISR support Platforms with an SM-X slot Input packet classification Supported on the module
MACsec support No Auto-switchover Supported with Cisco IOS XE Software Release 3.16
Auto-failover Supported with Cisco IOS XE Software Release 3.16 Software baseline Cisco IOS XE Release 3.11S or later required; Cisco IOS XE Release 3.13.1 or later recommended for SM-X-6X1G and SM-X-4X1G-1X10G
Installation verification show diag identifies Product Identifier (PID): SM-X-6X1G Dimensions 1.57 x 8.11 x 8.15 in. (40 x 206 x 207 mm)
Weight 872 grams Operating temperature 0°C to 40°C (32°F to 104°F)
Storage temperature -40°C to 70°C (-38°F to 150°F) Relative humidity 5% to 95%
Operating humidity 5% to 85%

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    Posted on 05/08/2026
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    quick.

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    Posted on 31/07/2026
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    5.0

    Great value for the money.

    Todd R.
    Posted on 30/06/2026
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    5.0

    Turned up a day early

    Anders S.
    Posted on 08/06/2026
    Verified Buyer
    5.0

    No issues. they had it in stock when others didn’t.

    Sandra
    Posted on 25/05/2026
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    5.0

    Works fine, great deal

Questions & Answers

  • What is SM-X-6X1G used for?

    SM-X-6X1G is a Cisco 6-port high-density Gigabit Ethernet WAN service module for Cisco 4000 Series ISR platforms with an SM-X slot.
  • Which forwarding role do the SM-X-6X1G ports perform?

    The six SM-X-6X1G ports operate as routed Layer 3 interfaces. The module does not provide onboard Layer 2 switching for a local access network.
  • How much chassis space does SM-X-6X1G require?

    SM-X-6X1G uses one single-wide Enhanced Service Module slot. The module measures 1.57 x 8.11 x 8.15 in., so the router plan must reserve an SM-X position rather than a NIM slot.
  • Which difference separates SM-X-6X1G from SM-X-4X1G-1X10G?

    SM-X-6X1G provides six 1GE routed ports, while SM-X-4X1G-1X10G supports either four 1GE ports or one 10G SFP+ port.
  • Does SM-X-6X1G provide dual-mode GE/SFP ports?

    Yes, SM-X-6X1G provides six dual-mode Gigabit Ethernet ports for copper or SFP media. They operate as routed Layer 3 interfaces.
  • Can SM-X-6X1G provide Power over Ethernet?

    No, SM-X-6X1G does not support Power over Ethernet. The six dual-mode GE/SFP interfaces are routed WAN ports rather than powered access ports.

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DataSheet Downloads

  • SM-X-6X1G Datasheet