C9300-24UB-E – 24x1G UPOE Ports – Higher-Scale Buffer – 830W PoE Budget

Brand: Cisco Category: Catalyst 9300 Switches Model: C9300-24UB-E
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C9300-24UB-E Description

The C9300-24UB-E is a Cisco Catalyst 9300 Series higher-scale stackable access switch for closets that need larger MAC and route tables than a standard 24-port Gigabit model. The switch has 24 10/100/1000 Cisco UPOE ports, an 830W PoE budget on the default 1100W supply, a modular uplink slot, a 32 MB packet buffer and 112,000 IPv4 routes. It stacks only with other higher-scale models, and the -E suffix carries Network Essentials, which leaves out BGP, VXLAN and MPLS.

Quick Specs

Parameter

Specification

Product ID

C9300-24UB-E

Downlink ports

24 x 10/100/1000 UPOE copper ports

Higher-scale profile

32 MB buffer for higher-scale Gigabit Ethernet models

Uplink architecture

Modular uplink slot; C9300-NM-8X is the default C9300 order selection unless changed

Network license

Network Essentials

Default power supply

PWR-C1-1100WAC-P

Default PoE budget

830W

Minimum software release

Cisco IOS XE Gibraltar 16.12.1

Stacking and StackPower

StackWise-480 with StackPower support

Expanded PoE budget

1440W with supported secondary power supply configuration

Switching and forwarding

208 Gbps standalone switching; 154.76 Mpps standalone forwarding

Product Performance

Higher-Scale Packet Buffer
MAC Address Scale
Standalone Switching Capacity

Key Features

Higher-Scale Table Sizes

The higher-scale group holds 64,000 MAC addresses, 112,000 IPv4 routes, 56,000 IPv6 routing entries and 18,000 QoS and ACL entries. A standard Catalyst 9300 holds 32,000 MAC addresses and 32,000 IPv4 routes.

32 MB Packet Buffer

The buffer is double the 16 MB of the standard 24-port Gigabit models, which helps when many downlinks burst toward the uplink at once.

Stacking Within The Higher-Scale Group

Stacks of up to eight switches run at 480 Gbps, but only with other higher-scale members and at one license level. A standard Catalyst 9300 cannot join the stack.

UPOE Budget Across 24 Ports

Each port can deliver up to 60W, and the default 1100W supply leaves 830W for PoE, about 34W per port if all 24 draw power at once. A second 1100W supply lifts the budget to 1440W, which covers a full 60W on every port.

Modular Uplink Slot

Uplinks come from a Catalyst 9300 network module such as the 8 x 10G/1G SFP+ C9300-NM-8X or the 2 x 40G C9300-NM-2Q, and the default configuration ships without one. Changing uplink speed later means swapping the module rather than the switch.

Network Essentials Feature Set

Network Essentials covers Layer 2, routed access with OSPF up to 1,000 routes, 802.1X and MACsec-128. BGP, VXLAN, MPLS and MACsec-256 need Network Advantage.

Application Scenarios

Large Layer 2 Aggregation Closet

A closet that collects many downstream switches can use the 64,000-entry MAC table to hold their addresses while powering UPOE endpoints on its own 24 copper ports.

Dense Wireless Floor

On a floor with many access points and the clients behind them, the 32 MB buffer and larger tables suit the traffic that each closet has to forward.

Higher-Scale Stack In A Data Closet

Several higher-scale switches can form one StackWise-480 stack with Network Essentials running Layer 2 and routed access, and every member comes from the higher-scale group.

Product Comparison

Parameter

C9300-24UB-E

C9300-24UB-A

C9300-24U-E

C9300-24UXB-E

Total 10/100/1000, Multigigabit copper or SFP fiber

24 x 10/100/1000 UPOE

24 x 10/100/1000 UPOE

24 x 10/100/1000 UPOE

24 x 10G/mGig UPOE

Uplink configuration

Modular uplinks

Modular uplinks

Modular uplinks

Modular uplinks

Network license

Network Essentials

Network Advantage

Network Essentials

Network Essentials

Available PoE power with default power supply

830W

830W

830W

560W

Maximum PoE power with 1100W secondary PS

1440W

1440W

1440W

1440W

Packet buffer per SKU

32 MB

32 MB

16 MB

64 MB

MAC addresses

64,000

64,000

32,000

64,000

Total number of IPv4 routes (ARP plus learned routes)

112,000

112,000

32,000

112,000

Switching capacity

208 Gbps

208 Gbps

208 Gbps

640 Gbps

C9300-24UB-E and C9300-24U-E both give 24 1G UPOE ports and an 830W default budget, but C9300-24UB-E is the higher-scale model with a 32 MB buffer, 64,000 MAC addresses and 112,000 IPv4 routes against 16 MB, 32,000 and 32,000, and it stacks only with other higher-scale models. Sites that need 10G/mGig UPOE access move to C9300-24UXB-E, which has 24 multigigabit ports, a 64 MB buffer and 640 Gbps standalone switching, but a lower 560W default PoE budget. A site that needs Network Advantage orders C9300-24UB-A, or raises an installed C9300-24UB-E with a C9300-LIC= term (C9300-24-E-A-3, -5 or -7), which cannot be placed on the switch order.

PoE Power Planning

Planning Item

Cisco Confirmed Value

Order Impact

Default PoE budget

C9300-24UB-E is listed with 830W available PoE and PWR-C1-1100WAC-P as the default supply

Size the UPOE endpoint plan against the confirmed default budget before adding secondary power

Secondary supply options

The C9300-24UB-E power table lists higher PoE values when compatible secondary supplies are added

Decide whether the order needs redundancy, additional PoE capacity, or a blank supply module

UPOE access profile

C9300-24UB-E is a 24-port 10/100/1000 UPOE model

Prevent substitution with data-only, PoE+, UPOE+, or mGig access SKUs unless the endpoint requirement changes

StackPower

C9300-24UB-E supports StackPower

Add StackPower cables only when the stack power design requires shared power across compatible Catalyst 9300 members

Ordering Checklist

  • Subscription: Select C9300-DNA-E-24-3Y, -5Y or -7Y, the 24-port Cisco DNA Essentials term. New orders need a subscription of the same tier as the network license, and the configurator defaults to Advantage, so change the tier for an Essentials switch.
  • Uplink module: Keep the default C9300-NM-8X, choose another C9300-NM module, or select C9300-NM-NONE. The uplink slot ships with C9300-NM-8X unless changed.
  • Second power supply: A second PWR-C1-1100WAC-P is added by default; C9300-SPS-NONE removes it. Without it the PoE budget stays at the single-supply 830W.
  • Stack and StackPower cables: A 50 cm StackWise cable and a 30 cm StackPower cable are added by default; C9300-STACK-NONE and C9300-SPWR-NONE remove them. A stack needs a StackWise cable of the right length, so a stand-alone switch can drop both.
  • Power cords: Select the cord type for the destination country. Two cords ship, and the configurator defaults to North American cords.

Optional Add-ons

Model

Description

C9300-NM-4G

Catalyst 9300 Series 4x 1G Network Module

C9300-NM-8X

Catalyst 9300 Series 8x 10G/1G Network Module

C9300-NM-2Q

Catalyst 9300 Series 2x 40G Network Module

C9300-NM-2Y

Catalyst 9300 Series 2x 25G/10G/1G Network Module

C9300-NM-4M

Catalyst 9300 Series 4x Multigigabit Network Module

C9300-DNX-E-24-3Y

C9300 Cisco Catalyst Essentials 24-port 3 Year Term license

C9300-DNX-E-24-5Y

C9300 Cisco Catalyst Essentials 24-port 5 Year Term license

C9300-DNX-E-24-7Y

C9300 Cisco Catalyst Essentials 24-port 7 Year Term license

PWR-C1-1100WAC-P=

1100W AC Platinum-rated power supply spare

STACK-T1-50CM=

Cisco StackWise-480/1T 50cm stacking cable spare

STACK-T1-1M=

Cisco StackWise-480/1T 1m stacking cable spare

STACK-T1-3M=

Cisco StackWise-480/1T 3m stacking cable spare

CAB-SPWR-30CM=

Cisco Catalyst StackPower cable 30cm spare

CAB-SPWR-150CM=

Cisco Catalyst StackPower cable 150cm spare

C9300-24UB-E 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 C9300-24UB-E Product type Higher-scale stackable access switch with modular uplinks
Network license Network Essentials Minimum software release Cisco IOS XE Gibraltar 16.12.1
Downlink ports 24 x 10/100/1000 UPOE copper ports Network module slot Modular C9300 network module slot
Supported network modules C9300-NM-4G, C9300-NM-8X, C9300-NM-2Q, C9300-NM-2Y, C9300-NM-4M Switching capacity 208 Gbps
Forwarding rate 154.76 Mpps Switching capacity with stacking 688 Gbps
Forwarding rate with stacking 511.90 Mpps Packet buffer 32 MB
DRAM 8 GB Flash 16 GB
MAC addresses 64,000 VLAN IDs 4,094
IPv4 routes 112,000 total routes IPv6 routes 56,000
Multicast routes 16,000 ACL entries 18,000
QoS entries 18,000 Flexible NetFlow entries 128,000 flows for higher-scale Gigabit Ethernet models
Jumbo frames 9,198 bytes Stacking StackWise-480
Stack bandwidth 480 Gbps Stack mixing Higher-scale C9300 models only
StackPower Supported Default power supply PWR-C1-1100WAC-P
Default PoE budget 830W Dimensions (H x W x D) 1.73 x 17.5 x 19.2 in. (4.4 x 44.5 x 48.8 cm)

Quality Certifications

Customer Reviews

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    Kathryn Reyes
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    Quality matched what we’d get from a premium distributor. Took a little longer to clear customs than expected, otherwise excellent.

    Charlotte Torres
    Posted on 21/01/2026
    Verified Buyer
    5.0

    Their reputation is well-deserved. Everything went as expected.

    Pamela Suzuki
    Posted on 12/01/2026
    Verified Buyer
    5.0

    Layer23’s pre-sales process is structured, professional, and customer-friendly.

    Han Solo
    Posted on 22/07/2025
    Verified Buyer
    5.0

    Fast ship? You bet. Made it here in record time.

    Raya Winsmore
    Posted on 14/04/2025
    Verified Buyer
    5.0

    UPOE+ budget runs touchscreens and badge readers with headroom.

Questions & Answers

  • Can C9300-24UB-E be stacked?

    Yes, but only with other higher-scale Catalyst 9300 models. C9300-24UB-E stacks up to 8 switches at 480 Gbps over StackWise-480 at one license level, and a standard Catalyst 9300 cannot join the stack. StackPower is supported.

  • What does Network Essentials on C9300-24UB-E include?

    Network Essentials on C9300-24UB-E covers Layer 2, routed access with OSPF up to 1,000 routes, 802.1X and MACsec-128. BGP, VXLAN, MPLS and MACsec-256 are not part of this tier. The -E suffix carries this tier on the switch.

  • Can the secondary supply in C9300-24UB-E be the 1900W model?

    Yes. PWR-C1-1900WAC-P is orderable on modular-uplink Catalyst 9300 switches and mixes with the other supplies, including the default PWR-C1-1100WAC-P. It delivers 1500W when fed at 115V and 1900W when fed at 230V, and it needs its own power cord, so check the cord type on the quote.

  • Is ThousandEyes bundled with an Essentials subscription for C9300-24UB-E?

    No. TE-EMBEDDED-T, the ThousandEyes Network and Application Synthetics license, ships by default only with 3, 5 or 7-year Cisco Catalyst or Cisco DNA Advantage subscriptions. A Network Essentials subscription for C9300-24UB-E does not include it, so an Advantage tier is needed to get it.

  • How long do PoE endpoints on C9300-24UB-E stay dark after a reboot?

    Under 30 seconds when Fast PoE is set. Perpetual PoE covers an upgrade reload, a crash and a manual reboot, in a stack as well. Fast PoE restores endpoint power in under 30 seconds from stored power and needs perpetual-poe-ha on the port. Power loss and hibernation are not covered.

  • How many shared-power members can a StackPower ring hold when C9300-24UB-E is one of them?

    A StackPower ring holds up to four switches with 1+N redundancy. Adding the XPS 2200 expandable power system allows up to eight switches in a star topology. Two power stacks can exist inside one eight-member data stack. The ring cables are CAB-SPWR-30CM and CAB-SPWR-150CM.

  • Which license tier must the other stack members of C9300-24UB-E run?

    They must run the same license tier, Network Essentials, and the same IOS XE release as C9300-24UB-E. Mixing an Advantage member into the stack is not allowed. All members use SSO and NSF, and only higher-scale models can be added, up to eight switches in one stack.

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