C9300-24UXB-A – 24x10G mGig UPOE Ports – Higher-Scale Buffer – 560W PoE Budget

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C9300-24UXB-A Description

The C9300-24UXB-A is a Cisco Catalyst 9300 Series higher-scale stackable access switch for campus wiring closets that serve multigigabit endpoints and need deeper address and route tables. The switch has 24 multigigabit UPOE ports, a modular uplink slot, 640 Gbps of switching capacity, a 560W default PoE budget, a 64 MB packet buffer and Network Advantage licensing. As a higher-scale model it stacks only with other higher-scale Catalyst 9300 switches, not with standard C9300 units.

Quick Specs

Parameter

Specification

Product ID

C9300-24UXB-A

Product type

Higher-scale stackable access switch with modular uplinks

Downlink ports

24 x 100M/1G/2.5G/5G/10G multigigabit Cisco UPOE copper ports

Scale profile

Catalyst 9300 higher-scale model

Packet buffer

64 MB for the 24-port Multigigabit higher-scale model

Network license

Network Advantage

Uplink architecture

Modular uplink slot for Cisco Catalyst 9300 network modules

Default power supply

PWR-C1-1100WAC-P

Default PoE budget

560W

Stacking and StackPower

StackWise-480 with StackPower support

Expanded PoE budget

1440W with supported secondary power supply configuration

Minimum software release

Cisco IOS XE Gibraltar 16.12.1

Switching and forwarding

640 Gbps standalone switching; 476.19 Mpps standalone forwarding

Product Performance

Higher-scale mGig packet buffer
Default PoE budget
Standalone switching capacity

Key Features

Multigigabit UPOE Downlinks

All 24 copper ports negotiate 100M, 1G, 2.5G, 5G or 10G and deliver Cisco UPOE, so one port type serves Wi-Fi access points and high-draw endpoints.

64 MB Packet Buffer

The 24-port multigigabit higher-scale model carries a 64 MB buffer, which gives bursty multigigabit traffic more headroom than standard Catalyst 9300 multigigabit models.

Larger Forwarding Tables

The higher-scale group supports 64,000 MAC addresses, 112,000 IPv4 routes, 56,000 IPv6 routes and 18,000 QoS and ACL entries.

Network Advantage Feature Scope

The -A suffix adds VRF, VXLAN, TrustSec, BGP and MACsec-256 on top of Layer 2 and routed access.

Higher-Scale Stacking Boundary

StackWise-480 supports up to eight members, but higher-scale models stack only with other higher-scale models and not with standard C9300 switches.

Modular Uplink Slot

Uplink media comes from a separate Catalyst 9300 network module, with options from 1G SFP to 25G SFP28 and 40G QSFP, so the access ports do not fix the uplink speed.

Application Scenarios

Large Campus Access Closet

In a wiring closet that serves many Wi-Fi access points and multigigabit desktops, the switch uses its 64,000 MAC address table and 112,000 route capacity to hold a large number of attached clients.

Multigigabit UPOE Floor

A floor of high-draw endpoints such as PTZ cameras and multigigabit access points can run from the 24 UPOE ports, with a second supply added when the 560W default budget runs short.

Higher-Scale Stack Group

A building that already runs higher-scale Catalyst 9300 members can add this switch to the same stack, since higher-scale models stack only with each other.

Product Comparison

Parameter

C9300-24UXB-A

C9300-24UXB-E

C9300-24UX-A

C9300-24UB-A

Downlink ports

24 x 100M/1G/2.5G/5G/10G UPOE

24 x 100M/1G/2.5G/5G/10G UPOE

24 x 100M/1G/2.5G/5G/10G UPOE

24 x 10/100/1000 UPOE

Available PoE power (default)

560W

560W

560W

830W

Network module uplinks

Modular

Modular

Modular

Modular

Network license

Network Advantage

Network Essentials

Network Advantage

Network Advantage

Stack bandwidth

480 Gbps; higher-scale models only

480 Gbps; higher-scale models only

480 Gbps; standard C9300 models only

480 Gbps; higher-scale models only

Switching capacity

640 Gbps

640 Gbps

640 Gbps

208 Gbps

Packet buffer

64 MB

64 MB

32 MB

32 MB

MAC addresses

64,000

64,000

32,000

64,000

IPv4 routes

112,000

112,000

32,000

112,000

C9300-24UXB-A is the Network Advantage version of the higher-scale 24-port Multigigabit UPOE switch also sold as C9300-24UXB-E, and the license tier is the only difference between the two. Essentials-level designs without VRF, VXLAN, TrustSec, BGP or MACsec-256 can order C9300-24UXB-E, and an installed Essentials switch is lifted later with a C9300-24-E-A-3, -5 or -7 term. The 64 MB buffer, 64,000 MAC addresses and 112,000 routes separate it from C9300-24UX-A, which has 32,000 MAC addresses and 32,000 routes, but higher-scale members stack only with other higher-scale models. Gigabit UPOE access with 830W of default PoE moves to C9300-24UB-A.

PoE Power Planning

Planning Item

Cisco Confirmed Value

Order Impact

Default PoE budget

C9300-24UXB-A is listed with 560W available PoE and PWR-C1-1100WAC-P as the default supply

Size the powered endpoint count against the default supply before adding a secondary power supply

Secondary supply options

The C9300-24UXB-A power table lists 910W with a 350W secondary supply, 1275W with a 715W secondary supply, and 1440W with an 1100W secondary supply

Decide whether the quote needs extra PoE capacity or only power redundancy

UPOE port class

Cisco UPOE ports support Type 1, Type 2, Type 3, and Cisco UPOE powered devices up to 60W per port

Prevent substitution with data-only, PoE+, or UPOE+ SKUs unless the endpoint power class changes

StackPower

StackPower can let a switch use power from other stack members when internal supplies cannot support the total load

Add StackPower cabling only where the site power design uses shared stack power

Ordering Checklist

  • Software subscription: Order a 24-port Advantage term: C9300-DNA-A-24-3Y, C9300-DNA-A-24-5Y or C9300-DNA-A-24-7Y. Cisco DNA Advantage is the default selection and matches this Network Advantage switch; a different tier is not accepted on a new order.
  • Uplink module: Keep the default C9300-NM-8X, pick C9300-NM-4G, C9300-NM-4M, C9300-NM-2Q or C9300-NM-2Y, or select C9300-NM-NONE. The uplink slot takes Catalyst 9300 modules only; C9300X modules do not fit.
  • Second power supply: A second PWR-C1-1100WAC-P is selected by default and C9300-SPS-NONE removes it. A single supply leaves the PoE budget at 560W.
  • Stacking cables: The default 50 cm StackWise cable and 30 cm StackPower cable ship unless C9300-STACK-NONE and C9300-SPWR-NONE remove them. A stack with members in different rows needs longer cables, which the 50 cm default does not cover.
  • Power cords: Select the cord type for the destination country; two cords ship with the switch. The configurator defaults to North America cords.

Optional Add-ons

Model

Description

C9300-NM-4G

Catalyst 9300 4 x 1GE SFP network module

C9300-NM-8X

Catalyst 9300 8 x 10G/1G SFP+ network module

C9300-NM-2Q

Catalyst 9300 2 x 40GE QSFP network module

C9300-NM-2Y

Catalyst 9300 2 x 25G/10G/1G SFP28 network module

C9300-NM-4M

Catalyst 9300 4 x 10G/mGig copper network module

NM-BLANK-T1=

Cisco Catalyst Type 1 network module blank spare

C9300-DNA-A-24-3Y

C9300 Cisco DNA Advantage 24-port 3 Year Term license

C9300-DNA-A-24-5Y

C9300 Cisco DNA Advantage 24-port 5 Year Term license

C9300-DNA-A-24-7Y

C9300 Cisco DNA Advantage 24-port 7 Year Term license

PWR-C1-1100WAC-P=

1100W AC Platinum-rated power supply spare

STACK-T1-50CM=

Data stack 50 cm cable option for C9300 and C9300X SKUs

STACK-T1-1M=

Data stack 1 m cable option for C9300 and C9300X SKUs

STACK-T1-3M=

Data stack 3 m cable option for C9300 and C9300X SKUs

C9300-24UXB-A Switch Rear Panel

The switch rear panel includes StackWise connectors, StackPower or XPS connectors, ports, fan modules, and power supply modules.

1

Ground connectors

7

StackPower connectors

2

USB3.0–SSD port

8

AC OK (input) status LED

3

BEACON LED

9

PS OK (output) status LED

4

CONSOLE (RJ-45 console port)

10

StackWise-480 port connectors

5

MGMT (RJ-45 10/100/1000 management port)

11

Power supply modules

6

Fan modules

–

–

Rear Panel of a Cisco Catalyst 9300 Series Switch

Components Delivered in the Shipping Box

The shipping box contains the model of the switch you ordered and other components needed for installation. Some components are optional, depending on your order.

1

Cisco Catalyst 9300 Series switch with optional network module1 (power supply and fan modules not shown)

9

Eight number-8 Phillips flat-head screws

2

AC power cord

10

Cable guide

3

Product documentation and compliance document

11

M4.0 x 20mm Phillips pan-head screw

4

Four rubber mounting feet

12

(Optional) RJ-45 console cable

5

Ground lug screw and ring terminal

13

(Optional) USB console cable

6

Two 19-inch mounting brackets

14

(Optional) StackWise-480/1T cable (0.5-meter, 1-meter, or 3-meter)

7

Four number-12 pan-head screws

15

(Optional) StackPower cable (0.3-meter or 1.5-meter)

8

Four number-10 pan-head screws

16

(Optional) StackWise-320 cable

cisco-catalyst-9300-switch-shipping-box

Specifications

Parameter Specification Parameter Specification
Product ID C9300-24UXB-A Product type Higher-scale stackable access switch with modular uplinks
Network license Network Advantage Downlink ports 24 x 100M/1G/2.5G/5G/10G multigigabit Cisco UPOE copper ports
Scale profile Catalyst 9300 higher-scale model Default power supply PWR-C1-1100WAC-P
Default PoE budget 560W PoE with 350W secondary supply 910W
PoE with 715W secondary supply 1275W PoE with 1100W secondary supply 1440W maximum by port rating
Uplink architecture Optional field-replaceable C9300 network module Supported network modules C9300-NM-4G, C9300-NM-8X, C9300-NM-2Q, C9300-NM-2Y, C9300-NM-4M
Stacking architecture StackWise-480 Stack members Higher-scale C9300 models only
Stack bandwidth 480 Gbps StackPower Supported
Minimum software release Cisco IOS XE Gibraltar 16.12.1 Packet buffer 64 MB
Flexible NetFlow entries 256,000 flows for higher-scale 24-port Multigigabit models MAC addresses 64,000
IPv4 routes 112,000 total routes IPv6 routes 56,000
Multicast routes 16,000 QoS entries 18,000
ACL entries 18,000 DRAM 8 GB
Flash 16 GB VLAN IDs 4094
Jumbo frames 9198 bytes Switching capacity 640 Gbps standalone
Switching capacity with stacking 1,120 Gbps Forwarding rate 476.19 Mpps standalone
Forwarding rate with stacking 833.33 Mpps Dimensions 1.73 x 17.5 x 20.2 in. (4.4 x 44.5 x 51.3 cm)
Power supply input PWR-C1-1100WAC-P supports 115 to 240 VAC autoranging UPOE support Type 1, Type 2, Type 3, and Cisco UPOE powered devices up to 60W per port

Quality Certifications

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    Patrick Smith
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    Our quality benchmark is high. Layer23 hits it every time.

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    5.0

    Reliable end-to-end. Layer23 has my repeat business.

    Carl Johansson
    Posted on 23/03/2026
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    5.0

    Their pricing strategy clearly aims for long-term customer relationships.

    Bruce Banner
    Posted on 05/09/2025
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    Verified genuine. No issues with the hardware validation.

    Natasha Romanoff
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    Discreet packaging and fast service. Exactly what we needed.

Questions & Answers

  • Can C9300-24UXB-A be stacked?

    Yes, but only with other higher-scale Catalyst 9300 models. C9300-24UXB-A stacks up to eight members over StackWise-480, and standard C9300 switches cannot join the stack. StackPower is supported across the stacked members.
  • What does Network Advantage on C9300-24UXB-A include?

    Network Advantage on C9300-24UXB-A includes VRF, VXLAN, TrustSec, BGP and MACsec-256, plus Layer 2 and routed access. The -A suffix carries this tier, backed by higher-scale tables of 112,000 IPv4 routes and 64,000 MAC addresses.
  • How many switches can share power in one StackPower ring with C9300-24UXB-A?

    A StackPower ring supports up to four stack members sharing power. With the XPS 2200 expandable power system, up to eight members can be supported. Order the ring cables as CAB-SPWR-30CM or CAB-SPWR-150CM, because StackPower is available only on modular-uplink Catalyst 9300 models and not on the fixed-uplink C9300L and C9300LM.
  • Can C9300-24UXB-A use PWR-C1-1900WAC-P as a second power supply?

    Yes. PWR-C1-1900WAC-P is listed as an orderable supply for modular-uplink Catalyst 9300 models and mixes with the other 9300 supplies. It outputs 1500W at 115V input and 1900W at 230V input, and it uses its own power cord. Each switch takes two supplies in N+1 redundancy.
  • Do PoE devices on C9300-24UXB-A stay powered during a software reload?

    Yes for soft reloads. Perpetual PoE keeps device power through an upgrade, a crash or a manual reboot, and it works across a stack. It does not cover power loss, front-end processor removal or hibernation. Fast PoE restores device power in under 30 seconds from stored power and needs perpetual-poe-ha configured on the port.
  • How many NetFlow entries does C9300-24UXB-A support?

    C9300-24UXB-A supports up to 256,000 NetFlow entries because it is the higher-scale 24-port mGig model. Flexible NetFlow tables run 64,000-128,000 per model elsewhere in the family. Size flow monitors for a closet of 24 multigigabit ports against that figure.
  • Does a Network Advantage subscription for C9300-24UXB-A include ThousandEyes?

    Yes. The ThousandEyes Network and Application Synthetics license, PID TE-EMBEDDED-T, is included by default with 3, 5 or 7-year Cisco Catalyst or Cisco DNA Advantage subscriptions on Catalyst 9300 switches, for the same term as the subscription. It is not included with Essentials subscriptions.
  • Which USB SSD options can C9300-24UXB-A use for external storage?

    C9300-24UXB-A takes an external USB 3.0 SSD, orderable as SSD-120G (120 GB) or SSD-240G (240 GB). The two drives are orderable across the Catalyst 9300 family and are not split by model, so one spare type covers every closet that runs modular-uplink Catalyst 9300 switches.
  • What must match across a StackWise-480 stack that includes C9300-24UXB-A?

    All members of the stack run SSO and NSF, and they need the same IOS XE release and the same license tier. A Network Advantage member such as C9300-24UXB-A cannot join an Essentials stack. Only higher-scale members can be added, and a stack holds up to eight switches.

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DataSheet Downloads

  • C9300-24UXB-A Datasheet

  • Cisco Catalyst 9300 Switch Datasheet