C9400-LC-12QC – 12×40G QSFP+ / 4×100G QSFP28 – Catalyst 9400 Line Card

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C9400-LC-12QC Description

C9400-LC-12QC, also known as Cisco Catalyst 9400 12-Port 100G/40G QSFP+ line card, enables high-speed 100 Gigabit and 40 Gigabit aggregation for the Catalyst 9400 modular switches. This module provides up to 12 QSFP+/QSFP28 slots, supporting either 12x40G QSFP+ or a mix of 4x100G QSFP28 plus 4x40G QSFP+ interfaces, ideal for flexible deployment in campus core or aggregation layers. The C9400-LC-12QC delivers up to 480Gbps line-rate bandwidth per slot (with SUP-2XL/2), supporting robust jumbo frame transport, hardware-based MACsec-256 encryption, and hot-swappable installation. Designed for modern data center, enterprise core, and high-performance network environments, this 100G/40G QSFP line card enables scalable and secure fiber backbone expansion.

Product Performance

Ethernet Ports
Maximum Bandwidth
Max rated power

Quick Spec

Parameter

Specification

Product Model

C9400-LC-12QC

Port Quantity

12 QSFP+/QSFP28 ports

Port Type

QSFP+ (40G) / QSFP28 (100G)

Max Per Slot Rate

480 Gbps (SUP-2XL/2), 240 Gbps (legacy SUP)

Supervisor Support

C9400X-SUP-2, C9400X-SUP-2XL only

Jumbo Frame Support

Up to 9216 bytes

MACsec

IEEE 802.1AE (MACsec-256) hardware support

Min. Software

IOS XE 17.12.1 or later

Max Power Usage

200W

Key Features

Flexible 100G/40G QSFP Ports

Offers up to 12 ports of 40G QSFP+ or a mix of 4x100G QSFP28 and 4x40G QSFP+ for versatile, high-speed fiber aggregation.

Line-Rate Bandwidth

Delivers up to 480Gbps per slot with compatible supervisors, ensuring non-blocking performance for core and aggregation networks.

MACsec-256 Security

Features hardware-based IEEE 802.1AE MACsec-256 encryption for secure, wire-speed transport across all QSFP ports.

Jumbo Frame Ready

Supports jumbo frames up to 9216 bytes, enabling efficient large-scale data transfers for modern workloads.

Supervisor-2/2XL Compatibility

Optimized for use with C9400X-SUP-2 and SUP-2XL engines, ensuring seamless operation and maximum throughput.

Hot-Swappable & Reliable

Allows tool-less installation and removal in any supported chassis slot, simplifying maintenance with high MTBF and robust design.

Front View

C9400-LC-12QC

1

STATUS LED

5

Captive installation screws

2

LOCATE (blue beacon) LED

6

Ejector levers

3

Vent holes for the port cage

7

PORT LINK LED

4

Model or product number

8

Line card Radio Frequency Identifier (RFID)

C9400-LC-12QC

When 100 Gbps connectivity is configured on ports 9 and 12:

  • Ports 5 and 8 are automatically disabled.
  • The PORT LINK LEDs for ports 5 and 8 turn amber to indicate this.
  • All other ports operate at 40 Gbps.

Alternatively, you can configure 100 Gbps on ports 10 and 11.

  • Doing so will disable ports 6 and 7.

C9400-LC-12QC Slot Bandwidth by SUP & Chassis

Supervisor Engine

Chassis

Per-Slot Bandwidth

Oversubscription

C9400X-SUP-2XL

C9404R

480 Gbps

1:1

C9407R

480 Gbps

1:1

C9410R

480 Gbps

1:1

C9400X-SUP-2

C9404R

240 Gbps

1:1

C9407R

240 Gbps

1:1

C9410R

240 Gbps

1:1

C9400-SUP-1XL

C9404R

240 Gbps

1:1

C9407R

120 Gbps

2:1

C9410R

80 Gbps

3:1

Product Comparison

Parameter

C9400-LC-12QC

C9400-LC-24XS

C9400-LC-48HX

Ports

12 × 40G QSFP+

24 × 10G SFP+

48 × 10G RJ-45

Breakout Support

4 × 10G per port

N/A

N/A

Slot Bandwidth

Up to 480 Gbps

Up to 480 Gbps

Up to 480 Gbps

PoE Support

No

No

Yes (UPOE+, 90W)

MACsec Support

Yes (256-bit)

Yes (256-bit)

Yes (256-bit)

Supervisor Support

SUP-1XL, SUP-2/2XL

SUP-2/2XL

SUP-2/2XL only

MTBF

418,200 hours

456,110 hours

402,300 hours

IOS XE Requirement

16.6.1+

17.3.1+

17.6.1+

Jumbo Frames

Supported

Supported

Supported

Line Card Supervisor Module Compatibility Overview

C9400-SUP-1

C9400-SUP-1XL

C9400-SUP-1XL-Y

C9400X-SUP-2

C9400X-SUP-2XL

C9400-LC-12QC

No

No

No

Yes

Yes

C9400-LC-24S

Yes

Yes

Yes

Yes

Yes

C9400-LC-24XS

Yes

Yes

Yes

Yes

Yes

C9400-LC-24XY

No

No

No

Yes

Yes

C9400-LC-48H

Yes

Yes

Yes

Yes

Yes

C9400-LC-48HN

Yes

Yes

Yes

Yes

Yes

C9400-LC-48HX

No

No

No

Yes

Yes

C9400-LC-48P

Yes

Yes

Yes

Yes

Yes

C9400-LC-48S

Yes

Yes

Yes

Yes

Yes

C9400-LC-48T

Yes

Yes

Yes

Yes

Yes

C9400-LC-48TX

No

No

No

Yes

Yes

C9400-LC-48U

Yes

Yes

Yes

Yes

Yes

C9400-LC-48UX

Yes

Yes

Yes

Yes

Yes

C9400-LC-48XS

No

No

No

Yes

Yes

Specifications

Parameter Description
Model C9400-LC-12QC
Port Count 12 × QSFP+
Port Speed 40G or 4x10G (breakout)
Breakout Support Yes (10G x4 per port)
MACsec Supported, 256-bit
PoE Not supported
Slot Bandwidth Up to 480 Gbps
Supervisor Compatibility SUP-1XL, SUP-2, SUP-2XL
Chassis Compatibility C9404R, C9407R, C9410R
IOS XE Requirement 16.6.1 or later
Energy Efficient Ethernet IEEE 802.3az
Jumbo Frame Up to 9216 bytes
MTBF 418,200 hours

Get More Information

Need pricing, stock, or shipping details for the C9400-LC-12QC ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.

Quality Certifications

Customer Reviews

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    Bryan Ross
    Posted on 15/04/2026
    Verified Buyer
    5.0

    Helpful with follow-up paperwork our accounting team requested.

    Omar Santos
    Posted on 10/02/2026
    Verified Buyer
    5.0

    Our operations team reported no incidents since deployment. Best compliment possible.

    Alan Kennedy
    Posted on 29/12/2025
    Verified Buyer
    4.0

    If the reviews seem too good to be true, they’re not. Layer23 delivers.

    Kitty Pryde
    Posted on 18/07/2025
    Verified Buyer
    5.0

    Walked right through customs without an issue. Good paperwork.

    Network Eng
    Posted on 10/03/2025
    Verified Buyer
    5.0

    Item packed well in anti-static. Good handling.

Questions & Answers

  • What is C9400-LC-12QC used for with 100G and 40G QSFP ports?

    C9400-LC-12QC is a Catalyst 9400 QSFP line card for 40G or 100G aggregation, core, and high-speed campus connectivity.
  • What port modes does C9400-LC-12QC support?

    C9400-LC-12QC supports either 12 ports of 40G QSFP+ or a mix of 4 ports of 100G QSFP28 plus 4 ports of 40G QSFP+.
  • Does C9400-LC-12QC require SUP-2 or SUP-2XL for QSFP28?

    Yes. C9400-LC-12QC requires C9400X-SUP-2 or C9400X-SUP-2XL for its 100G and 40G QSFP design.
  • Is C9400-LC-12QC for access endpoints?

    No. C9400-LC-12QC is for 40G and 100G aggregation, not RJ-45 users, PoE endpoints, or SFP 1G access.
  • How is C9400-LC-12QC different from C9400-LC-24XY?

    C9400-LC-12QC is QSFP-based 40G or 100G. C9400-LC-24XY is SFP28 or SFP+ based for 25G and 10G connectivity.
  • What optics matter for C9400-LC-12QC?

    C9400-LC-12QC planning centers on QSFP28 and QSFP+ optics, 100G or 40G port mode, fiber type, distance, and switch compatibility.
  • When is C9400-LC-12QC the wrong line card?

    C9400-LC-12QC is wrong for 1G SFP access, 10G SFP+ density, copper access, PoE, or older supervisor designs.
  • What 100G QSFP28 and 40G QSFP+ details matter for C9400-LC-12QC?

    C9400-LC-12QC planning depends on 100G and 40G port mix, SUP-2 or SUP-2XL, chassis model, QSFP optics, uplink design, and aggregation bandwidth.

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  • C9400-LC-12QC Datasheet