C8151-G2 – 2x1GE Combo WAN – 2x Flex + 6x LAN – LTE/5G Pluggable – SD-WAN

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C8151-G2 Description

The C8151-G2 is a Cisco 8100 Series Secure Router for small branches that pair a wired circuit with LTE or 5G backup. The fanless router forwards 5.6 Gbps and carries 900 Mbps of SD-WAN traffic at 512 bytes, with two 1GE RJ-45/SFP combo WAN ports, six 1GE LAN ports and 500K IPv4 routes. The cellular slot takes a pluggable LTE or 5G module that is fitted separately, and the router is not a PoE power sourcing device.

Quick Specs

Parameter

Specification

Product ID

C8151-G2

Platform type

Fanless small-branch router

WAN ports

2x 1GE RJ-45/SFP combo

Flex ports

2 x GE RJ-45

LAN ports

6x 1GE RJ-45

Cellular

Optional pluggable module, LTE or 5G

SD-WAN capable

Yes

SD-WAN throughput

900 Mbps at 512 bytes

Forwarding throughput

5.6 Gbps at 512 bytes

IPv4 routes

500K

External power supply

66W external power supply

Weight

5.1 lb

Minimum software release

Cisco IOS XE 17.18.1

Product Performance

Forwarding Throughput
SD-WAN Throughput
Threat Protection Throughput

Key Features

Pluggable Cellular Slot

The cellular slot takes a pluggable module, so the radio can be matched to the region and replaced without replacing the router. The supported modules are P-5GS6-R16SA-GL for 5G SA Global and the CAT7 LTE Advanced P-LTEA7-NA, P-LTEA7-EAL and P-LTEA7-JP for North America, EMEA with APAC and LATAM, and Japan.

Combo WAN Pair And Gigabit LAN

Two 1GE RJ-45/SFP combo WAN ports accept a copper or a fibre handoff. Two Flex ports and six 1GE LAN ports serve the devices behind the router.

SD-WAN And Threat Protection Throughput

SD-WAN Capable is Yes, with 900 Mbps of SD-WAN throughput and 1 Gbps of Threat Protection. The router starts at Cisco IOS XE 17.18.1 and Cisco Catalyst SD-WAN Release 20.18.1.

Route And VRF Scale

The router holds 500K IPv4 routes, 500K IPv6 routes and 4K VRFs, with 100K NAT sessions and 250 IPsec tunnels. A branch that separates several traffic classes has room for them on one chassis.

Fanless Chassis, Many Mounting Options

The 5.1 lb body has no fan, draws 23W typical from a 66W external supply and mounts in a rack, on a desk, under a desk, on DIN-rail or on a wall.

Throughput Test Conditions

Forwarding is 5.6 Gbps and IPsec 1.5 Gbps at 512 bytes. The SD-WAN figure is measured with IPsec, QoS, deep packet inspection and Flexible NetFlow enabled, and the Threat Protection figure with DIA NAT, ZBFW, IPS, URL filtering and AMP enabled.

Application Scenarios

Branch With Cellular Backup

A small branch lands its fixed circuit on one of the combo WAN ports, and a pluggable LTE or 5G module in the cellular slot carries the traffic if that circuit fails.

SD-WAN Branch Endpoint

A retail store or clinic joins an SD-WAN fabric through the router, which sustains 900 Mbps of SD-WAN traffic at 512 bytes across its gigabit WAN ports.

Segmented Back Office

In an office that keeps point-of-sale, guest and staff traffic in separate VRFs, the router holds the routing tables and connects the local devices through its six LAN ports.

Product Comparison

Parameter

C8151-G2

C8161-G2

C8140-G2

WAN ports

2x 1GE RJ-45/SFP combo

2x 1GE RJ-45/SFP combo

2x 1GE RJ-45/SFP combo

LAN ports

6x 1GE RJ-45

6 x GE RJ-45 (4PoE/2PoE+)

6x 1GE RJ-45

Cellular

Optional pluggable module, LTE or 5G

Optional pluggable module, LTE or 5G

Not applicable

PoE output max power

Not applicable

80W

Not applicable

External power supply

66W

150W

66W

Forwarding (512B)

5.6 Gbps

5.6 Gbps

5.6 Gbps

SD-WAN (512B)

900 Mbps

900 Mbps

900 Mbps (from Cisco IOS XE 26.2.1)

Number of IPv4 routes

500K

500K

280K

Number of VRFs

4K

4K

1K

C8151-G2 and C8161-G2 share the same two combo WAN ports, six LAN ports, pluggable LTE or 5G slot, 5.6 Gbps forwarding and 500K IPv4 routes, but C8161-G2 adds 80W of PoE output on its LAN ports and ships with a 150W supply instead of 66W. Sites that power access points or cameras from the router need C8161-G2, because C8151-G2 is not a PoE power sourcing device. Sites that need no cellular and can wait for SD-WAN until Cisco IOS XE 26.2.1 can use C8140-G2, which has the same 5.6 Gbps forwarding and 900 Mbps SD-WAN but holds 280K IPv4 routes and 1K VRFs in place of 500K and 4K.

Ordering Checklist

  • Cellular pluggable: Add one of P-5GS6-R16SA-GL, P-LTEA7-NA, P-LTEA7-EAL or P-LTEA7-JP as the module for the deployment region. The router ships without one, and these four pluggables are supported only on C8151-G2 and C8161-G2.

Optional Add-ons

Add-on

Description

P-5GS6-R16SA-GL

5G Sub-6 GHz pluggable, 5G SA Global.

P-LTEA7-NA

CAT7 LTE Advanced pluggable, North America.

P-LTEA7-EAL

CAT7 LTE Advanced pluggable, EMEA, APAC and LATAM.

P-LTEA7-JP

CAT7 LTE Advanced pluggable, Japan.

66W external power supply

The external supply listed for this model.

Specifications

Parameter Specification Parameter Specification
Product ID C8151-G2 Series Cisco 8100 Series Secure Routers
Product type Fanless small-branch router WAN ports 2x 1GE RJ-45/SFP combo
Flex ports 2 x GE RJ-45 LAN ports 6x 1GE RJ-45
Cellular Optional pluggable module, LTE or 5G Supported cellular pluggables Cisco lists P-5GS6-R16SA-GL for 5G Sub-6 GHz 5G SA Global, P-LTEA7-NA for North America, P-LTEA7-EAL for EMEA, APAC and LATAM and P-LTEA7-JP for Japan, supported only on C8151-G2 and C8161-G2
Expansion slots None; the 8100 Series has no NIM or SM bay Management port 1 x RJ-45 console
Storage interface 1 x USB Type C 3.0 for out-of-band management External power supply 66W external power supply
Typical power consumption 23W SD-WAN capable Yes
Forwarding (512B) 5.6 Gbps IPsec (512B) 1.5 Gbps
SD-WAN (512B) 900 Mbps Threat protection (EMIX) 1 Gbps
SD-WAN measurement basis IPsec, Quality of Service, deep packet inspection and Flexible NetFlow enabled Threat protection measurement basis 100% Direct Internet Access NAT, Zone-Based Firewall, Intrusion Prevention System, URL Filtering and Advanced Malware Protection enabled
IPv4 routes 500K IPv6 routes 500K
IPv4 ACLs 4K IPv4 ACEs 10K
NAT sessions 100K VRFs 4K
IPsec tunnels 250 Dimensions (H x W x D) 1.57 x 8.5 x 12.7 in
Weight 5.1 lb Operating temperature 0 to 40°C at sea level, with 1 degree C of derating per 1000 feet above sea level
Storage temperature -40 to 70°C Operating humidity 5 to 85 percent relative humidity, noncondensing
Operating altitude 0 to 10,000 feet (0 to 3048 m) Storage altitude 0 to 15,000 feet (0 to 4572 m)
MTBF Greater than 100,000 hours Mounting Rackmount, desktop, under desk, DIN-rail or wall mount
Minimum software release Cisco IOS XE 17.18.1 Minimum SD-WAN manager release Cisco Catalyst SD-WAN Release 20.18.1

Quality Certifications

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    Sven
    Posted on 06/08/2026
    Verified Buyer
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    Works great

    Steven H.
    Posted on 27/05/2026
    Verified Buyer
    5.0

    Clear communication from start to finish.

    Sean
    Posted on 03/03/2026
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    5.0

    answered on a weekend, did not expect that

Questions & Answers

  • What forwarding throughput does C8151-G2 reach, and at what packet size?

    C8151-G2 forwards 5.6 Gbps at 512-byte packets. SD-WAN runs at 900 Mbps with IPsec, QoS, deep packet inspection and Flexible NetFlow enabled, and Threat Protection runs at 1 Gbps with NAT, firewall, IPS, URL filtering and AMP enabled.
  • Which software image options are listed for C8151-G2 at order time?

    The Cisco 8000 Series ordering guide lists two image options for C8151-G2, SC81G2UK9-1718 and SC81G2NEK9-1718. Both carry a minimum of Cisco IOS XE 17.18.1 for Routing and SD-WAN, so one release covers either mode.
  • Which external AC adapter is the default order configuration for C8151-G2?

    The Cisco 8000 Series ordering guide lists the default power supply as the AC adapter PWR-CC1-66WAC. The data sheet rates the external supply at 66W, and typical draw is 23W, so the default adapter covers the router at normal load.
  • From which release is platform-based licensing supported on C8151-G2?

    Platform-based licensing was introduced for C8151-G2 in Cisco IOS XE 17.18.1a, per the Cisco 8000 Series licensing guide. In autonomous mode the router then runs Cisco Routing OS Essentials or Cisco Routing Advantage (LIC-ROS-S-A).
  • Which license tags does C8151-G2 use in SD-WAN controller mode?

    In SD-WAN controller mode C8151-G2 takes Cisco WAN Essentials (LIC-CSWAN-S-E) or Cisco WAN Advantage (LIC-CSWAN-S-A), per the Cisco 8000 Series licensing guide. The Routing OS Essentials entitlement used in autonomous mode is not listed for controller mode.
  • Which blank fills the cellular module position on C8151-G2 when no module is fitted?

    The Cisco 8000 Series ordering guide lists the blank C8100-PIM-BLANK for C8151-G2. It covers the cellular module position when no LTE or 5G module is installed, so the opening stays closed and the chassis is not left with an exposed bay.
  • Which mounting kit PIDs are listed for C8151-G2?

    Per the Cisco 8000 Series ordering guide, C8151-G2 has three mounting options: the rack mount kit C8151-G2-RM-19, the DIN rail kit ACS-1111-DRM and the under desk kit ACS-1100-UDM. Desktop and wall placement need no kit.

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DataSheet Downloads

  • C8151-G2 Datasheet