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Maximum crypto throughput (bit-rate policed) | 150 Mbps |
IP and IP services |  Routing Information Protocol Versions 1 and 2 (RIPv1 and RIPv2)  Generic Routing Encapsulation (GRE) and Multipoint GRE (MGRE)  Cisco Express Forwarding  Standard 802.1d Spanning Tree Protocol  Layer 2 Tunneling Protocol (L2TP)  L2TP Version 3 (L2TPv3)  Network Address Translation (NAT)  Dynamic Host Configuration Protocol (DHCP) server, relay, and client  Dynamic DNS  DNS Proxy  DNS Spoofing  Access Control Lists (ACLs)  IPv4 and IPv6 multicast  Open Shortest Path First (OSPF)  Border Gateway Protocol (BGP)  Performance Routing (PfR)  Enhanced Interior Gateway Routing Protocol (EIGRP)  Virtual Route Forwarding (VRF) Lite  Next Hop Resolution Protocol (NHRP)  Bidirectional Forwarding Detection (BFD)  Web Cache Communication Protocol (WCCP) |
xDSL |  True Multimode VDSL2 and ADSL2+ over Annex A, B, J, and M, including traditional G.DMT and T1.413  World-class interoperability with industry-standard DSL Access Multiplexer (DSLAM) chipsets  Highest field reliability with Impulse Noise Protection (INP) over Repetitive Electrical Impulse Noise (REIN) and single isolated impulse noise (SHINE), extended INP delay, G.INP, physical layer retransmission, Seamless Rate Adaptation (SRA), and Bitswap  VDSL2 Persistent Storage Device (PSD) profiles up to 17a/b with support for spectral shaping  VDSL2 vectoring to offer blazing fiber speeds over copper  Remote management with TR069 and CWMP  Investment protection with Gigabit Ethernet |
Switch features |  Auto Media Device In/Media Device Cross Over (MDI-MDX)  25 802.1Q VLANs  MAC filtering  Switched Port Analyzer (SPAN)  Storm control  Smart ports  Secure MAC address  Internet Group Management Protocol Version 3 (IGMPv3) snooping  802.1X               |
Security features | Secure connectivity:  Secure Sockets Layer (SSL) VPN for secure remote access  Hardware-accelerated DES, 3DES, AES 128, AES 192, and AES 256  Public-Key-Infrastructure (PKI) support  50 IPsec tunnels  Cisco Easy VPN client and server  NAT transparency  Dynamic Multipoint VPN (DMVPN)  Tunnel-less Group Encrypted Transport VPN (GET VPN)  VRF-aware IPsec  IPsec over IPv6  Adaptive control technology  Session Initiation Protocol (SIP) application-layer gateway  Cisco IOS Firewall:   Zone-based policy firewall   VRF-aware stateful inspection routing firewall   Stateful inspection transparent firewall  Advanced application inspection and control  HTTPS, FTP, and Telnet Authentication Proxy  Dynamic and static port security  Firewall stateful failover  VRF-aware firewall  Cisco IOS Software black and white lists  Integrated threat control:   Intrusion Prevention System (IPS)  Control plane policing  Flexible packet matching  Network foundation protection |
Quality of Service (QoS) |  Low-Latency Queuing (LLQ)  Weighted Fair Queuing (WFQ)  Class-Based WFQ (CBWFQ)  Class-Based Traffic Shaping (CBTS)  Class-Based Traffic Policing (CBTP)  Policy-Based Routing (PBR)  Class-Based QoS MIB  Class of Service (CoS)-to-Differentiated Services Code Point (DSCP) mapping  Class-Based Weighted Random Early Detection (CBWRED)  Network-Based Application Recognition (NBAR)  Link Fragmentation and Interleaving (LFI)  Resource Reservation Protocol (RSVP)  Real-Time Transport Protocol (RTP) header compression (cRTP)  Differentiated Services (DiffServ)  QoS preclassify and prefragmentation  Hierarchical QoS (HQoS) |
Management |  Cisco Configuration Professional  Cisco Configuration Express  Cisco Configuration Engine support  Cisco AutoInstall  Cisco IP Service-Level Agreement (IP SLA)  Cisco IOS Embedded Event Manager (EEM)  CiscoWorks  Cisco Security Manager  Telnet, Simple Network Management Protocol Version 3 (SNMPv3), Secure Shell (SSH) Protocol, Command-Line Interface (CLI), and HTTP management  RADIUS and TACACS+  Cisco Next Generation Plug-and-Play (NG PnP) Protocol       |
High availability | Â Virtual Router Redundancy Protocol (VRRP) (RFC 2338) Â HSRP Â MHSRP |
Metro Ethernet |  Ethernet OA&M  Ethernet Local Management Interface (E-LMI)  IP SLA for Ethernet       |
IPv6 |  IPv6 addressing architecture  IPv6 name resolution  IPv6 statistics  IPv6 translation: Transport packets between IPv6-only and IPv4-only endpoints (NAT-Protocol Translation)  Internet Control Message Protocol Version 6 (ICMPv6)  IPv6 DHCP  OSPFv3  BGP4+  IPv6 Path Maximum Transmission Unit (PMTU)  IPv6 neighbor discovery  IPv6 stateless address autoconfiguration (SLAAC)  IPv6 multicast routing |
Application visibility and control | Â NBAR2 Â Flexible NetFlow (FNF) Â Performance Agent |
Number of recommended users | 50 |
Default and maximum DRAM | Â Default 1 GB |
Default and maximum flash memory | Â 2 GB on all Cisco 900 Series ISR models; not upgradable |
WAN | Â Refer to Table 2 for details |
LAN switch | Â Refer to Table 2 for details |
Separate console ports | Â RJ-45 |
USB 2.0 | Â One USB 2.0 Type A port |
Physical dimensions | Â H x W x D = 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet) |
Power supply | Power specifications:  AC input voltage: Universal 100 to 240 VAC  Frequency: 50 to 60 Hz  Internal power supply (C921-4P and C931-4P only) |
Approvals and compliance | Safety: Â IEC 60950-1 Â UL 60950-1 Â CAN/CSA C22.2 No. 60950-1 Â EN 60950-1 Â AS/NZS 60950.1 Â Class I Equipment (C921-4P and C931-4P only) Â Class III Equipment (C927-4P, C927-4PM, and C926-4P only) Emissions: Â 47 CFR Part 15: 2006 Â Â CISPR22: Edition 6.0: 2008 Â Â CNS13438: 2006 Â Â EN 300 386 V1.6.1 Â Â EN 55032 Â Â EN61000-3-2: 2006 [+ amd 1 & 2] Â Â EN61000-3-3: 2008 Â Â ICES-003 Issue 5: 2012 Â Â KN 22: 2009 Â TCVN 7189: 2009 Â VCCI: V-3/2012.04 Immunity: Â CISPR24: 2010 [+ amd 1 & 2] Â Â EN300386: V1.6.1 Â Â EN55024: 2010 Â Â EN61000-6-1: 2007 Â Â KN24: 2011 Â Â TCVN 7317:2003 |
Environmental operating range | Â Nonoperating temperature: -40 to 158F (-40 to 70C) Â Nonoperating humidity: 5% to 95% relative humidity (noncondensing) Â Nonoperating altitude: 0 to 15,000 ft (0 to 4570 m) Â Operating temperature: 0 to 50C (de-rate 1C per 1000-ft increase in altitude) Â Operating humidity: 5% to 95% relative humidity (noncondensing) Â Operating altitude: 0 to 10,000 ft (0 to 3000 m) |
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The Cisco 900 Series Integrated Services Routers (ISR 900) combines WAN, comprehensive security, and advanced connectivity in a compact, fanless platform. The routers are designed to provide enterprise-class security and connectivity for small to medium businesses. The ISR 921 model comes with a 4-port managed switch, providing LAN ports to connect multiple devices and up to 150 Mbps of VPN throughput for high performance. These small, yet powerful, fixed-configuration routers provide secure broadband and Metro Ethernet connectivity. The routers deliver integrated security and threat defense, protecting networks from both known and new Internet vulnerabilities and attacks.
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WAN interfaces | 2 ports Gigabit Ethernet (GE) |
LAN interfaces | 4-port GE managed switch |
Integrated USB 2.0 | Yes |
Default and maximum DRAM | Default 1 GB |
Default and maximum flash memory | 2 GB; not upgradable |
Dimensions (H x W x D) | 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet) |
IP and IP services |  Routing Information Protocol Versions 1 and 2 (RIPv1 and RIPv2)  Generic Routing Encapsulation (GRE) and Multipoint GRE (MGRE)  Cisco Express Forwarding  Standard 802.1d Spanning Tree Protocol  Layer 2 Tunneling Protocol (L2TP)  L2TP Version 3 (L2TPv3)  Network Address Translation (NAT)  Dynamic Host Configuration Protocol (DHCP) server, relay, and client  Dynamic DNS  DNS Proxy  DNS Spoofing  Access Control Lists (ACLs)  IPv4 and IPv6 multicast  Open Shortest Path First (OSPF)  Border Gateway Protocol (BGP)  Performance Routing (PfR)  Enhanced Interior Gateway Routing Protocol (EIGRP)  Virtual Route Forwarding (VRF) Lite  Next Hop Resolution Protocol (NHRP)  Bidirectional Forwarding Detection (BFD)  Web Cache Communication Protocol (WCCP) |
xDSL |  True Multimode VDSL2 and ADSL2+ over Annex A, B, J, and M, including traditional G.DMT and T1.413  World-class interoperability with industry-standard DSL Access Multiplexer (DSLAM) chipsets  Highest field reliability with Impulse Noise Protection (INP) over Repetitive Electrical Impulse Noise (REIN) and single isolated impulse noise (SHINE), extended INP delay, G.INP, physical layer retransmission, Seamless Rate Adaptation (SRA), and Bitswap  VDSL2 Persistent Storage Device (PSD) profiles up to 17a/b with support for spectral shaping  VDSL2 vectoring to offer blazing fiber speeds over copper  Remote management with TR069 and CWMP  Investment protection with Gigabit Ethernet |
Switch features |  Auto Media Device In/Media Device Cross Over (MDI-MDX)  25 802.1Q VLANs  MAC filtering  Switched Port Analyzer (SPAN)  Storm control  Smart ports  Secure MAC address  Internet Group Management Protocol Version 3 (IGMPv3) snooping  802.1X        |
Security features | Secure connectivity:  Secure Sockets Layer (SSL) VPN for secure remote access  Hardware-accelerated DES, 3DES, AES 128, AES 192, and AES 256  Public-Key-Infrastructure (PKI) support  50 IPsec tunnels  Cisco Easy VPN client and server  NAT transparency  Dynamic Multipoint VPN (DMVPN)  Tunnel-less Group Encrypted Transport VPN (GET VPN)  VRF-aware IPsec  IPsec over IPv6  Adaptive control technology  Session Initiation Protocol (SIP) application-layer gateway  Cisco IOS Firewall:   Zone-based policy firewall   VRF-aware stateful inspection routing firewall   Stateful inspection transparent firewall  Advanced application inspection and control  HTTPS, FTP, and Telnet Authentication Proxy  Dynamic and static port security  Firewall stateful failover  VRF-aware firewall  Cisco IOS Software black and white lists  Integrated threat control:   Intrusion Prevention System (IPS)  Control plane policing  Flexible packet matching  Network foundation protection |
Quality of Service (QoS) |  Low-Latency Queuing (LLQ)  Weighted Fair Queuing (WFQ)  Class-Based WFQ (CBWFQ)  Class-Based Traffic Shaping (CBTS)  Class-Based Traffic Policing (CBTP)  Policy-Based Routing (PBR)  Class-Based QoS MIB  Class of Service (CoS)-to-Differentiated Services Code Point (DSCP) mapping  Class-Based Weighted Random Early Detection (CBWRED)  Network-Based Application Recognition (NBAR)  Link Fragmentation and Interleaving (LFI)  Resource Reservation Protocol (RSVP)  Real-Time Transport Protocol (RTP) header compression (cRTP)  Differentiated Services (DiffServ)  QoS preclassify and prefragmentation  Hierarchical QoS (HQoS) |
Management |  Cisco Configuration Professional  Cisco Configuration Express  Cisco Configuration Engine support  Cisco AutoInstall  Cisco IP Service-Level Agreement (IP SLA)  Cisco IOS Embedded Event Manager (EEM)  CiscoWorks  Cisco Security Manager  Telnet, Simple Network Management Protocol Version 3 (SNMPv3), Secure Shell (SSH) Protocol, Command-Line Interface (CLI), and HTTP management  RADIUS and TACACS+  Cisco Next-Generation Plug-and-Play (NG PnP) Protocol |
High availability | Â Virtual Router Redundancy Protocol (VRRP) (RFC 2338) Â HSRP Â MHSRP |
Metro Ethernet | Â Ethernet OA&M Â Ethernet Local Management Interface (E-LMI) Â IP SLA for Ethernet |
IPv6 |  IPv6 addressing architecture  IPv6 name resolution  IPv6 statistics  IPv6 translation: Transport packets between IPv6-only and IPv4-only endpoints (NAT-Protocol Translation)  Internet Control Message Protocol Version 6 (ICMPv6)  IPv6 DHCP  OSPFv3  BGP4+  IPv6 Path Maximum Transmission Unit (PMTU)  IPv6 neighbor discovery  IPv6 stateless address autoconfiguration (SLAAC)  IPv6 multicast routing |
Application visibility and control | Â NBAR2 Â Flexible NetFlow (FNF) Â Performance Agent |
Number of recommended users | 50 |
Default and maximum DRAM | Default 1 GB |
Default and maximum flash memory | Â 2 GB on all Cisco 900 Series ISR models; not upgradable |
WAN | Refer to Table 2 for details |
LAN switch | Refer to Table 2 for details |
Separate console ports | RJ-45 |
USB 2.0 | Â One USB 2.0 Type A port |
Physical dimensions | H x W x D = 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet) |
Power supply | Power specifications:  AC input voltage: Universal 100 to 240 VAC  Frequency: 50 to 60 Hz  Internal power supply (C921-4P and C931-4P only) |
Approvals and compliance | Safety: Â IEC 60950-1 Â UL 60950-1 Â CAN/CSA C22.2 No. 60950-1 Â EN 60950-1 Â AS/NZS 60950.1 Â Class I Equipment (C921-4P and C931-4P only) Â Class III Equipment (C927-4P, C927-4PM, and C926-4P only) Emissions: Â 47 CFR Part 15: 2006 Â Â CISPR22: Edition 6.0: 2008 Â Â CNS13438: 2006 Â Â EN 300 386 V1.6.1 Â Â EN 55032 Â Â EN61000-3-2: 2006 [+ amd 1 & 2] Â Â EN61000-3-3: 2008 Â Â ICES-003 Issue 5: 2012 Â Â KN 22: 2009 Â TCVN 7189: 2009 Â VCCI: V-3/2012.04 Immunity: Â CISPR24: 2010 [+ amd 1 & 2] Â Â EN300386: V1.6.1 Â Â EN55024: 2010 Â Â EN61000-6-1: 2007 Â Â KN24: 2011 Â Â TCVN 7317:2003 |
Environmental operating range | Â Nonoperating temperature: -40 to 158F (-40 to 70C) Â Nonoperating humidity: 5% to 95% relative humidity (noncondensing) Â Nonoperating altitude: 0 to 15,000 ft (0 to 4570 m) Â Operating temperature: 0 to 50C (de-rate 1C per 1000-ft increase in altitude) Â Operating humidity: 5% to 95% relative humidity (noncondensing) Â Operating altitude: 0 to 10,000 ft (0 to 3000 m) |
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The Cisco 900 Series Integrated Services Routers (ISR 900) combines WAN, comprehensive security, and advanced connectivity in a compact, fanless platform. The routers are designed to provide enterprise-class security and connectivity for small to medium businesses. The ISR 931 model comes with a 4-port managed switch, providing LAN ports to connect multiple devices and up to 250 Mbps of VPN throughput for high performance. These small, yet powerful, fixed-configuration routers provide secure broadband and Metro Ethernet connectivity. The routers deliver integrated security and threat defense, protecting networks from both known and new Internet vulnerabilities and attacks.
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WAN interfaces | 2 ports Gigabit Ethernet (GE) |
LAN interfaces | 4-port GE managed switch |
Maximum crypto throughput (bit-rate policed) | 250 Mbps |
Integrated USB 2.0 | Yes |
Default and maximum DRAM | Default 1 GB |
Default and maximum flash memory | 2 GB; not upgradable |
Dimensions (H x W x D) | 1.70 x 9.0 x 9.5 in. (4.32 x 22.86 x 24.13 cm) (includes rubber feet) |