Model Comparison: ISR 4321 vs. 4331 vs. 4351 vs. 4431 vs. 4451 Router

The Cisco ISR 4000 Series is still a hot topic when users select a router to set up a better network.

Enabled by ISR 4000

How to find out the very right Cisco 4000 router for your branch office? Let’s read the main model comparison of Cisco ISR 4000 routers.

The 4000 Series contains five platforms: the 4451, 4431, 4351, 4331, and 4321 ISRs.

Model Comparison: ISR 4321 vs. 4331 vs. 4351 vs. 4431 vs. 4451 Router

Feature 4321 4331

4351 4431

4451

Form factor 1 rack unit (RU)
Desktop
1 RU 2 RU 1 RU 2 RU
Integrated WAN ports 1 GE / SFP
1 GE
1 GE / SFP
1 GE
1 SFP
2 PoE GE / SFP
1 GE/ SFP
2 PoE GE / SFP
2 GE / SFP
2 PoE GE / SFP
2 GE / SFP
Performance 50 Mbps
Upgradable to 100 Mbps
100 Mbps
Upgradable to 300 Mbps
200 Mbps
Upgradable to 400 Mbps
500 Mbps
Upgradeable to 1 Gbps
1 Gbps
Upgradable to 2 Gbps
Management port 1 GE (Integrated Out of Band)
Network Interface Modules (NIM) 2 2 3 3 3
Enhanced Services Module (SM-X) N/A 1 single-wide 2 single- or
1 double-wide
N/A 2 single- or
1 double-wide
Integrated Services Card (ISC) slots 1
(PVDM 4)
1
(PVDM 4)
1
(PVDM 4)
1
(PVDM 4)
1
(PVDM 4)
USB ports (type A) 1 1 2 2 2
Default/max Flash 4 GB / 8 GB 4 GB / 16 GB 4 GB / 16 GB 8 GB / 32 GB 8 GB / 32 GB
Default/max DRAM 4 GB / 8 GB 4 GB / 16 GB 4 GB / 16 GB 4 GB / 16 GB 4 GB / 16 GB
Power supply type External: AC, PoE Internal: AC, PoE Internal: AC, PoE or DC Internal: AC, PoE or DC Internal: AC, PoE or DC
Redundant power supply No No No Yes
Internal RPS
Yes
Internal RPS
Module online insertion and removal (OIR) Yes Yes Yes Yes Yes
Server virtualization platform (UCS E-Series) N/A 2-core single-wide,
4-core single-wide
2 core single-wide,
4 core single-wide,
4 core double-wide,
6 core double-wide,
8 core double-wide
N/A 2-core single-wide,
4-core single-wide,
4-core double-wide,
6-core double-wide,
8-core double-wide
Advanced Security 4321 4331 4351 4431 4451
Zone-based firewall and NAT services VRF-Aware Firewall and Network Address Translation (NAT)
Hardware VPN acceleration 
(DES, 3DES, AES)
No
IPSEC VPN services FlexVPN, Easy VPN remote server, Enhanced Easy VPN, Dynamic Multipoint VPN (DMVPN),
Group Encrypted Transport VPN (GET VPN), V3PN, MPLS VPN
SSL VPN No
Intrusion prevention Yes
Network foundation protection ACL, FPM, control plan protection, control plane policing (CoPP), QoS, role-based CLI access, source-based RTBH, uRPF, SSHv2
Cisco Cloud Web Security Yes*
Identity-based networking No No No No No
Cisco TrustSec
  • Security Group Tag Exchange Protocol (SXP), SGT over GETVPN
  • SGT over IPSEC
  • SGT over DMVPN
  • SGT-based ZBFW
  • Port/Layer 3 interface/IP/subnet-to-SGT mapping
  • SGT export in Flexible NetFlow
Unified Communications 4321 4331 4351 4431 4451
Local conferencing Yes Yes Yes Yes Yes
Digital signal processor support PVDM4 PVDM4 PVDM4 PVDM4 PVDM4
Cisco Unified Survivable Remote Site
Telephony support
Up to 50 Up to 100 Up to 750 Up to 1200 Up to 2000
Cisco Unified Communications
Manager Express support
Up to 50 Up to 100 Up to 250 Up to 350 Up to 450
Cisco Unity Express
(NM, SM, or ISM)
Use Cisco Unity Connection on UCSE Use Cisco Unity Connection on UCSE Use Cisco Unity Connection on UCSE Use Cisco Unity Connection on UCSE Use Cisco Unity Connection on UCSE
Cisco Unified Border Element (CUBE)
(SIP/H.323 sessions)
100 400 1000 3000 6000
nano Cisco Unified Border Element (nanoCUBE)
(sessions)
N/A N/A N/A N/A N/A
Digital voice and video (T1/E1 channels) Up to 240 Up to 360 Up to 720 Up to 720 Up to 1200
Analog/BRI voice Up to 8 ports (FXS, FXO, E/M, BRi) Up to 12 ports (FXS, FXO, E/M, BRi) Up to 20 ports (FXS, FXO, E/M, BRi) Up to 12 ports (FXS, FXO, E/M, BRi) Up to 20 ports (FXS, FXO, E/M, BRi)
Routing and Multicast 4321 4331 4351 4431 4451
IPv4 routing protocols RIP v1/v2, EIGRP, OSPF, BGP, PBR, PfR RIP v1/v2, EIGRP, OSPF, BGP, PBR, PfR RIP v1/v2, EIGRP, OSPF, BGP, PBR, PfR RIP v1/v2, EIGRP, OSPF, BGP, PBR, PfR RIP v1/v2, EIGRP, OSPF, BGP, PBR, PfR
Multicast routing protocols PIM-SM, mroute (static route), and MLD PIM-SM, mroute (static route), and MLD PIM-SM, mroute (static route), and MLD PIM-SM, mroute (static route), and MLD PIM-SM, mroute (static route), and MLD
IPv6 routing protocols EIGRP, RIP, OSPFv3, IS-IS,
BGP and PBR
EIGRP, RIP, OSPFv3, IS-IS,
BGP and PBR
EIGRP, RIP, OSPFv3, IS-IS,
BGP and PBR
EIGRP, RIP, OSPFv3, IS-IS,
BGP and PBR
EIGRP, RIP, OSPFv3, IS-IS,
BGP and PBR
Wireless LAN 4321 4331 4351 4431 4451
Integrated 802.11 b/g/n access point N/A N/A N/A N/A N/A
Integrated 802.11 a/b/g/n access point N/A N/A N/A N/A N/A
Unified and autonomous mode N/A N/A N/A N/A N/A
RP-TNC connectors for field-replaceable
optional high-gain antennas
N/A N/A N/A N/A N/A
Diversity (dual antennas) N/A N/A N/A N/A N/A
Wireless LAN controller module Available on UCS E-Series Available on UCS E-Series Available on UCS E-Series Available on UCS E-Series Available on UCS E-Series
Wireless WAN 4321 4331 4351 4431 4451
3G /4G LTE cellular Yes*
Outdoor antennas N/A N/A N/A N/A N/A
Integrated Switching 4321 4331 4351 4431 4451
Maximum switched Ethernet ports N/A 24 48 N/A 48
Maximum switched Ethernet LAN ports with PoE N/A 24 48 N/A 48
PoE support (wattage)
without PoE boost
120 W 250 W 500 W 250 W
(with optional power supply redundancy)
500 W
(with optional power supply redundancy)
PoE support (wattage)
with PoE boost
260 W 530 W 990 W 500 W
(no power supply redundancy)
950 W
(no power supply redundancy)
EtherSwitch Service Module type (width) N/A 1 single 2 single or 1 double N/A 2 single or 1 double
Application Services 4321 4331 4351 4431 4451
Intelligent Path Control PfR PfR PfR PfR PfR
Network Contention Control QoS, HQoS QoS, HQoS QoS, HQoS QoS, HQoS QoS, HQoS
Application Visibility NBAR v2 NBAR v2 NBAR v2 NBAR v2 NBAR v2
WAN Optimization ISR-WAAS ISR-WAAS,
vWAAS on UCS E-Series
ISR-WAAS,
vWAAS on UCS E-Series
ISR-WAAS ISR-WAAS,
vWAAS on UCS E-Series
Akamai Connect Yes Yes Yes Yes Yes
Cisco Application Centric Infrastructure Application Policy Infrastructure Controller (APIC) with Enterprise Module

 

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