C9600-LC-40YL4CD – 40xSFP56 – 2xQSFP56 and 2xQSFP-DD – Catalyst 9600 Line Card

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C9600-LC-40YL4CD Description

The C9600-LC-40YL4CD is a Cisco Catalyst 9600 Series combo line card for Catalyst 9606R chassis in campus aggregation and core designs. The card has 40 SFP56 ports, 2 QSFP56 ports and 2 QSFP-DD ports, and it installs in slots 1, 2, 5 and 6 with either C9600X-SUP-2 or C9600-SUP-1. QSFP-DD operation, including 400G, needs C9600X-SUP-2, and the card requires Cisco IOS XE 17.7.1 or later.

Quick Specs

Parameter

Specification

Product ID

C9600-LC-40YL4CD

Product type

Combo line card

Supported chassis

Cisco Catalyst 9606R

Supervisor compatibility

C9600X-SUP-2 and C9600-SUP-1

Installation slot rule

Catalyst 9606R slots 1, 2, 5, and 6

SFP56 ports

40

SFP56 speed with C9600X-SUP-2

50G, 25G, and 10G

SFP/SFP28 speed with C9600-SUP-1

25G, 10G, and 1G

QSFP56 ports with C9600X-SUP-2

2 ports supporting 200G, 100G, and 40G

QSFP-DD ports with C9600X-SUP-2

2 ports supporting 400G, 200G, 100G, and 40G

Minimum software release

Cisco IOS XE 17.7.1

Bandwidth per slot

6.4 Tbps (3.2 Tbps full-duplex) with C9600X-SUP-2; 2.4 Tbps (1.2 Tbps full-duplex) with C9600-SUP-1

Key Features

40 SFP56 Plus 4 QSFP Ports

Forty SFP56 ports sit beside two QSFP56 and two QSFP-DD ports, so downlinks and high-speed uplinks share one line card slot.

Speeds Set By The Supervisor Engine

With C9600X-SUP-2 the SFP56 ports run at 50G, 25G and 10G, the QSFP56 ports at 200G, 100G and 40G and the QSFP-DD ports at 400G, 200G, 100G and 40G. With C9600-SUP-1 the SFP ports run at 25G, 10G and 1G, and QSFP-DD operation is not supported.

Cisco IOS XE 17.7.1 Baseline

The card starts at Cisco IOS XE 17.7.1 on both supervisor engines, a later release than the 16.11.1 that older Catalyst 9600 line cards accept with C9600-SUP-1.

Port Group Speed Rules

With C9600X-SUP-2, adjacent SFP56 ports in a port group must run the same speed, and the speed of port 43 sets the speed of port 44.

10G And 1G Through CVR-QSFP-SFP10G

The CVR-QSFP-SFP10G adapter lets QSFP ports take 10G transceivers with C9600X-SUP-2, and 10G or 1G transceivers with C9600-SUP-1.

420 W Power Draw

The card requests 420 W of DC output power, draws 466 W of AC input and dissipates 1590 BTU/hr, which the chassis power budget has to cover.

Application Scenarios

Mixed-Speed Aggregation

In a campus aggregation layer, the card terminates access-facing links on its 40 SFP56 ports and sends traffic upstream on the QSFP56 and QSFP-DD ports from one slot of the Catalyst 9606R.

400G Uplinks From A Core Chassis

A campus core on C9600X-SUP-2 uses the two QSFP-DD ports for 400G or 200G links while the SFP56 ports run at 50G, 25G or 10G on the same card.

Product Comparison

Parameter

C9600-LC-40YL4CD

C9600-LC-48YL

C9600-LC-24C

Description

40x SFP56, 2x QSFP56 and 2x QSFP-DD

48x SFP56 at 50/25/10/1GE

24x QSFP28 at 40GE and 100GE

Supported supervisor engines

C9600-SUP-1 and C9600X-SUP-2

C9600-SUP-1 and C9600X-SUP-2

C9600-SUP-1 and C9600X-SUP-2

Maximum port speed with C9600X-SUP-2

SFP56 50G, QSFP56 200G, QSFP-DD 400G

SFP56 50G

QSFP28 100G

Per-slot bandwidth with C9600X-SUP-2

6.4 Tbps (3.2 Tbps full-duplex)

6.4 Tbps (3.2 Tbps full-duplex)

6.4 Tbps (3.2 Tbps full-duplex)

Per-slot bandwidth with C9600-SUP-1

2.4 Tbps (1.2 Tbps full-duplex)

2.4 Tbps (1.2 Tbps full-duplex)

2.4 Tbps (1.2 Tbps full-duplex)

Minimum software release

Cisco IOS XE 17.7.1

Cisco IOS XE 16.11.1 with C9600-SUP-1; 17.7.1 with C9600X-SUP-2

Cisco IOS XE 16.11.1 with C9600-SUP-1; 17.7.1 with C9600X-SUP-2

C9600-LC-40YL4CD is the combo card of this group, with 40 SFP56 ports plus 2 QSFP56 and 2 QSFP-DD ports, while C9600-LC-48YL has 48 SFP56 ports and no QSFP positions and C9600-LC-24C has 24 QSFP28 ports. Links above 100G, up to 200G on the QSFP56 ports and 400G on the QSFP-DD ports, need C9600-LC-40YL4CD on C9600X-SUP-2. Slot bandwidth is set by the supervisor, not the card: 6.4 Tbps (3.2 Tbps full-duplex) per slot with C9600X-SUP-2 and 2.4 Tbps (1.2 Tbps full-duplex) with C9600-SUP-1, the same for C9600-LC-48YL and C9600-LC-24C. A chassis that needs only SFP-family links stays on C9600-LC-48YL, which starts at Cisco IOS XE 16.11.1 with C9600-SUP-1 against 17.7.1 here, and a QSFP28-only design moves to C9600-LC-24C. All three run on C9600X-SUP-2 and C9600-SUP-1; on C9600-SUP-1 this card offers 40 ports of 25G, 10G or 1G plus 2 ports of 100G or 40G.

Ordering Checklist

  • Chassis: Install the card in the Catalyst 9600 Series 6 Slot Chassis, PID C9606R, the only chassis listed for this line card. It has 4 line card slots, and slots 3 and 4 are reserved for supervisor engines.
  • Supervisor engines: Pair the card with C9600-SUP-1 or C9600X-SUP-2, since both engines support it, at Cisco IOS XE 17.7.1 on each.

C9600-LC-40YL4CD Front Panel Components

1

Status LED

5

2 x 400G/200G/100G/40G QSFP-DD ports

2

Locate (Blue beacon) LED

6

Port Link LEDs

3

40 x 50G/25G/10G SFP56 ports

7

Ejector levers

4

2 x 200G/100G/40G QSFP56 ports

8

RFID embedded on the left ejector lever

Specifications

Parameter Specification Parameter Specification
Product ID C9600-LC-40YL4CD Product type Combo line card
Supported chassis Cisco Catalyst 9606R Installation slot rule Slots 1, 2, 5, and 6
Supervisor compatibility C9600X-SUP-2 and C9600-SUP-1 Minimum software release Cisco IOS XE 17.7.1
SFP56 ports 40 SFP56 speed with C9600X-SUP-2 50G, 25G, and 10G
SFP/SFP28 speed with C9600-SUP-1 25G, 10G, and 1G QSFP56 ports with C9600X-SUP-2 2 ports supporting 200G, 100G, and 40G
QSFP-DD ports with C9600X-SUP-2 2 ports supporting 400G, 200G, 100G, and 40G QSFP-DD support with C9600-SUP-1 Not supported
QSA adapter support with C9600X-SUP-2 CVR-QSFP-SFP10G with 10G transceivers QSA adapter support with C9600-SUP-1 CVR-QSFP-SFP10G with 10G and 1G transceivers
Bandwidth with C9600X-SUP-2 6.4 Tbps (3.2 Tbps full-duplex) per slot Bandwidth with C9600-SUP-1 2.4 Tbps (1.2 Tbps full-duplex) per slot
Port group restriction with C9600X-SUP-2 Adjacent SFP56 ports in a port group must run the same speed QSFP restriction with C9600X-SUP-2 Port 43 speed determines port 44 speed
AC input power 466 W DC output power requested 420 W
Heat dissipation 1,590 BTU/hr Weight 3.75 kg (8.27 lb)
Operating temperature up to 6000 ft -5°C to 45°C (23°F to 113°F) Operating altitude -60 to 3000 m (-197 to 9843 ft)

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    Sophia Gonzalez
    Posted on 15/03/2026
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    Tamper-evident seal was intact. Box clearly hadn’t been opened before us. Shipping took a couple extra days, but product itself is perfect.

    Elizabeth Petrov
    Posted on 24/12/2025
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    Their professionalism is on par with the largest distributors.

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    Each new project brings a new Layer23 order. The pattern is clear.

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    Efficient processing. We will order again.

    Clint Barton
    Posted on 30/08/2025
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    On target. Delivery was exactly when promised.

Questions & Answers

  • Does C9600-LC-40YL4CD support MACsec with C9600X-SUP-2?

    Yes. C9600-LC-40YL4CD supports MACsec and WAN MACsec when it runs with C9600X-SUP-2, from Cisco IOS XE 17.7.1. It is a Gen 2 line card, so it does not share the MACsec limit of the Gen 1 cards on that supervisor. Both supervisors are listed as supported for the card.
  • Does C9600-LC-40YL4CD need a separate uplink card in a C9606R?

    No. C9600-LC-40YL4CD puts its 40 SFP56 downlink ports and its 4 QSFP uplink ports on one card, with no additional modules, so a single line card slot serves both roles. This saves a slot and lowers the bill of materials in a Catalyst 9606R.
  • Which faceplate ports of C9600-LC-40YL4CD work with C9600-SUP-1?

    With C9600-SUP-1 the SFP ports numbered 1 to 40 and the QSFP28 ports numbered 41 and 42 are usable, at 40 or 100 GE on the QSFP28 pair. The QSFP-DD cages numbered 43 and 44 stay unusable, so any QSFP-DD link needs C9600X-SUP-2.
  • How do I check port-group speeds on C9600-LC-40YL4CD with C9600X-SUP-2?

    The card has 20 port groups, each a pair of the SFP ports numbered 1 to 40. Run show hw-module slot port-group to list them. A group with no speed set shows NONE and runs at its native speed. Port groups apply only with C9600X-SUP-2.
  • What MTBF and weight does Cisco publish for C9600-LC-40YL4CD?

    Cisco publishes a 580,420-hour MTBF and a weight of 3.75 kg (8.27 lbs) for C9600-LC-40YL4CD in the Catalyst 9600 data sheet. Both values are listed per card and do not depend on whether the chassis runs C9600-SUP-1 or C9600X-SUP-2.

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