Juniper QFX5120-48Y-AFO Switch

Juniper QFX5120-48Y-AFO Switch

Juniper QFX5120-48Y-AFO is a high-performance QFX5120 Series Ethernet switch built for modern data center and high-speed aggregation environments. It provides 48 SFP28 ports supporting 25GbE connectivity and 8 QSFP28 uplink ports supporting 100GbE, along with redundant fans and redundant AC power supplies for resilient operation. With front-to-back airflow and a compact 1U form factor, it is well suited for deployments that require scalability, performance, and efficient thermal management.

Properties	Juniper QFX5120-48Y-AFO
Description	QFX5120 with 48 x 25GbE SFP28 ports, 8 x 100GbE QSFP28 ports, redundant fans, redundant AC power supplies, and front-to-back airflow.
Product Family	QFX5120 Series
Product Type	Ethernet Switch
Dimensions (HxWxD) Inches	1.72 x 17.36 x 20.48 in (4.37 x 44.09 x 52.02 cm)
Rack Units	1 U
Weight	23.7 lb (10.75 kg)
Power Consumption	Max load: 272 W, Typical load: 247 W
Switching Mode	Cut-through and store-and-forward
Airflow	Front-to-back airflow (for hot aisle deployment)
Management and Console	2 x RJ-45 ports
Interface Options
10GbE SFP+	48
25GbE SFP28	48 / 80 (with breakout cable)
100GbE QSFP28	8
Port Options	Each QSFP28 port can be configured as a 4 x 25GbE interface or as a 100GbE port
Supported Modules and Cables	SFP GbE optical and copper modules, SFP+ 10GbE optical modules, SFP+ DAC cables (1/3/5 m twinax copper and 1/3/5/7 m active twinax copper), SFP28 DAC cables (1/3 m twinax copper), SFP28 SR/LR optics, and breakout copper cables
Rack Installation Kit	Versatile four-post mounting options for 19-in server rack or datacom rack
Cooling	Redundant variable-speed fans to reduce power draw
Power Supply and Fan Modules	Dual redundant (1+1) and hot-pluggable 650 W AC power supplies; 100-240 V single-phase AC power; redundant 4+1 and hot-pluggable fan modules for front-to-back airflow

Specifications	QFX5120-48Y-AFO
CPU	2.2 GHz quad-core Intel CPU
Memory	16 GB
Storage	50 GB SSD
Switching Capacity	4 Tbps (bidirectional) / 2 Bpps
Switching Mode	Cut-through and store-and-forward
Total Packet Buffer	16 MB
MAC Addresses per System	288,000
VLAN IDs	4,093
Number of Link Aggregation Groups (LAGs)	80
Number of Ports per LAG	64
IPv4 Unicast Routes	351,000 prefixes; 208,000 host routes; 64 ECMP paths
IPv4 Multicast Routes	104,000
IPv6 Multicast Routes	52,000
IPv6 Unicast Routes	168,000 prefixes; 104,000 host routes
Address Resolution Protocol (ARP) Entries	64,000
Jumbo Frame	9,216 bytes
Spanning Tree Protocol (STP)	Multiple Spanning Tree Protocol (MSTP) instances: 64 VLAN Spanning Tree Protocol (VSTP) instances: 509
Traffic Mirroring	Mirroring destination ports per switch: 4 Maximum number of mirroring sessions: 4 Mirroring destination VLANs per switch: 4
Software Specifications
Layer 2 Features	STP—IEEE 802.1D (802.1D-2004) Rapid Spanning Tree Protocol (RSTP) (IEEE 802.1w); MSTP (IEEE 802.1s) Bridge protocol data unit (BPDU) protect Loop protect Root protect RSTP and VSTP running concurrently VLAN—IEEE 802.1Q VLAN trunking Routed VLAN interface (RVI) Port-based VLAN Private VLAN (PVLAN) VLAN translation Static MAC address assignment for interface Per VLAN MAC learning (limit) MAC learning disable Link Aggregation and Link Aggregation Control Protocol (LACP) (IEEE 802.3ad) MACsec with AES256 (QFX5120-48YM only) Virtual chassis—up to 2 members on QFX5120-48Y, QFX5120-32C and QFX5120-48T
Layer 3 Features (IPv4)	Static routing Routing protocols (RIP, OSPF, IS-IS, BGP) Virtual Router Redundancy Protocol (VRRP) Virtual router Dynamic Host Configuration Protocol (DHCP) relay Proxy Address Resolution Protocol (ARP)
EVPN-VXLAN Features	MAC virtual routing and forwarding (MAC-VRF) multiple EVPN instances (EVI) with service-types vlan-based, vlan-aware, vlan-bundle Symmetric inter-IRB routing with anycast gateway and EVPN type-5 instances Proxy IGMPv2—EVPN route types 6/7/8 ARP/ND proxy/suppression ESI-LAG A/A multihoming using Enterprise and SP-style interfaces Enhanced Ethernet loop detection Filter-based forwarding on IRB.VGA EVPN advanced route policing VLAN-id overlapping using SP-style interfaces VLAN rewrite support in EVPN-VXLAN enterprise-style interfaces OISM - draft-ietf-bess-evpn-irb-mcast
Multicast Features	Internet Group Management Protocol (IGMP): v1, v2, v3 IGMP snooping: v1, v2, and v3 (Layer 2 only) IGMP filter Protocol Independent Multicast-Sparse Mode (PIM-SM), PIM-Source-Specific Multicast (PIM-SSM), PIM-Dense Mode (PIM-DM) in pure IP fabric use case Multicast Source Discovery Protocol (MSDP)
Link Aggregation	MC-LAG LAG load sharing algorithm—bridged or routed (unicast or multicast) traffic IP: Session Initiation Protocol (SIP), Dynamic Internet Protocol (DIP), TCP/UDP source port, TCP/UDP destination port Layer 2 and non-IP: MAC SA, MAC DA, Ethertype, VLAN ID, source port
Quality of Service (QoS)	L2 and L3 QoS: Classification, rewrite, queuing Rate limiting Ingress policing: Single-rate two-color policer, two-rate three-color policer Egress policing: Policer, policer mark down action Egress shaping: Per queue on each port 10 hardware queues per port (8 unicast and 2 multicast) Strict-priority queue (SPQ), shaped-deficit weighted round-robin (SDWRR), weighted random early detection (WRED), weighted tail drop 802.1p remarking Layer 2 classification criteria: Interface, MAC address, Ethertype, 802.1p, VLAN Congestion avoidance capabilities: WRED Trust IEEE 802.1p (ingress) Remarking of bridged packets Default inner to outer DiffServ code point (DSCP) copy for EVPN-VXLAN
Security and Filters	Secure interface login and password RADIUS TACACS+ Ingress and egress filters: Allow and deny, port filters, VLAN filters, and routed filters, including management port filters Filter actions: Logging, system logging, reject, mirror to an interface, counters, assign forwarding class, permit, drop, police, mark SSH v1, v2 Static ARP support in pure IP fabric Storm control, port error disable, and autorecovery Source MAC address filtering on the port DHCP snooping in pure IP fabric use case
IP Storage	Priority-based flow control (PFC)—IEEE 802.1Qbb, DCBX PFC using DSCP and explicit congestion notification (ECN) for ROCEv2
High Availability	Bidirectional Forwarding Detection (BFD) Uplink failure detection
MPLS	Static label-switched paths (LSPs) RSVP-based signaling of LSPs LDP-based signaling of LSPs LDP tunneling (LDP over RSVP) MPLS class of service (CoS) MPLS LSR support IPv6 tunneling (6PE) (via IPv4 MPLS backbone) IPv4 L3 VPN (RFC 2547, RFC 4364)
Management and Analytics Platforms	Juniper Apstra for Data Center Juniper Mist Wired Assurance for Campus Junos Space Network Director for Campus Paragon Insights
Traffic Mirroring	Port-based LAG port VLAN-based Filter-based Mirror to local Mirror to remote destinations (L2 over VLAN)
Device Management and Operations	Role-based CLI management and access CLI via console, telnet, or SSH Extended ping and traceroute Junos OS configuration rescue and rollback Image rollback SNMP v1/v2/v3 Junos XML management protocol sFlow v5 Beacon LED for port and system Inband Flow Analyzer (IFA) ZTP OpenStack Neutron Plug-in Python Junos OS event, commit, and OP scripts Junos Telemetry Interface
Operating Temperature	32° to 104° F (0° to 40° C)
Storage Temperature	-40° to 158° F (-40° to 70° C)
Operating Altitude	Up to 6000 ft (1829 m)
Relative Humidity Operating	5% to 90% (noncondensing)
Relative Humidity Non-operating	0% to 95% (noncondensing)
IEEE Standards	IEEE 802.1D IEEE 802.1w IEEE 802.1 IEEE 802.1Q IEEE 802.1p IEEE 802.1ad IEEE 802.3ad IEEE 802.1AB IEEE 802.3x IEEE 802.1Qbb IEEE 802.1Qaz
T11 Standards	INCITS T11 FC-BB-5
Supported RFCs	RFC 768 UDP RFC 783 Trivial File Transfer Protocol (TFTP) RFC 791 IP RFC 792 ICMP RFC 793 TCP RFC 826 ARP RFC 854 Telnet client and server RFC 894 IP over Ethernet RFC 903 RARP RFC 906 TFTP Bootstrap RFC 951/1542 BootP RFC 1058 Routing Information Protocol RFC 1112 IGMP v1 RFC 1122 Host requirements RFC 1142 OSI IS-IS Intra-domain Routing Protocol RFC 1256 IPv4 ICMP Router Discovery Protocol (IRDP) RFC 1492 TACACS+ RFC 1519 Classless Interdomain Routing (CIDR) RFC 1587 OSPF not-so-stubby area (NSSA) Option RFC 1591 Domain Name System (DNS) RFC 1745 BGP4/IDRP for IP—OSPF Interaction RFC 1772 Application of the Border Gateway Protocol in the Internet RFC 1812 Requirements for IP Version 4 Routers RFC 1997 BGP Communities Attribute RFC 7348 VXLAN—Virtual extensible Local Area Network RFC 8365 NVO—Network Virtualization Overlay Solution Using Ethernet VPN (EVPN-VXLAN) OISM - EVPN Optimized Inter-Subnet Multicast (OISM) Forwarding - draft-ietf-bess-evpn-irb-mcast IGMP and MLD Proxy for EVPN - draft-ietf-bess-evpn-igmp-mld-proxy RFC 2030 SNTP, Simple Network Time

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