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Details:
Description
Feature EX9251 EX9253
Architecture Single data, control, and management plane Separate dedicated data, control, and management planes
Power Holds up to two power supplies:
  • -40 to -72 V DC (1+1 redundancy)
  • Autosensing 120/240 V AC (1+1 redundancy)
  • Maximum power draw: 312 W (DC), 300 W (AC)
Holds up to six power supplies:
  • -40 to -72 V DC (3+1 redundancy)
  • 100-120 V AC (3+1 redundancy)
  • 200-240 V AC (3+1 redundancy)
  • Maximum power draw: 2692 W (DC), 2692 W (AC) 
Cooling Internally redundant fan tray with front-to-back airflow Internally redundant fan tray with front-to-back airflow
Weight (fully loaded) 23.15 lb (10.5 kg) 120 lb (54.43 kg)
Maximum throughput Up to 800 Gbps Up to 4.8 Tbps
Routing Engine (RE) Integrated single RE
1.6 GHz, 8 core Intel Xeon processor
Up to 32 gigabytes DRAM
Solid-state drive (SSD) (up to 100 GB)
Console, auxiliary serial, and Ethernet management ports USB storage interface
Primary and backup REs (1+1 redundancy)
1.6 GHz, 8-core Intel Xeon processor
Up to 64 gigabytes DRAM
Dual front pluggable solid-state drive (SSD) (up to 100 GB each)
Console, auxiliary serial, and Ethernet management ports USB storage interface
Operating system Juniper Networks Junos operating system Juniper Networks Junos operating system
High availability Hardware designed for continuous operation:
  • Secure, modular architecture that isolates faults
  • Separate control and forwarding planes that enhance scalability and resiliency
Hardware designed for continuous operation:
  • Secure, modular architecture that isolates faults
  • Separate control and forwarding planes that enhance scalability and resiliency
  • Transparent failover and network recovery
  • Graceful Routing Engine switchover (GRES)
  • Nonstop active routing (NSR)
  • Nonstop bridging (NSB)
Layer 2 features Up to 1 million MAC addresses 
Up to 512,000 Address Resolution Protocol (ARP) entries with mid-scale (ML) license (256,000 entries without ML license)
Up to 512,000 forwarding information base (FIB) entries with ML license (256,000 entries without ML license)
Jumbo frames (9192 bytes maximum)
32,000 VLANs 
VLAN Registration Protocol 
802.3ad—Link Aggregation Control Protocol (LACP)
802.1D—Spanning Tree Protocol (STP)
802.1w—Rapid Spanning Tree Protocol (RSTP)
802.1s—Multiple Spanning Tree Protocol (MSTP)
VLAN Spanning Tree Protocol (VSTP) Layer 2 Protocol Tunneling (L2PT)
Layer 3 features 1 million IPv4 routing information base (RIB)
1 million IPv6 RIB
Static routing
RIP v1/v2
OSPF v1/v2
OSPF v3
Filter-based forwarding
Virtual Router Redundancy Protocol (VRRP)
IPv6
Bidirectional Forwarding Detection (BFD)
Virtual routers 
BGP (Advanced Feature license) IS-IS (Advanced Feature license)
Hardware tunneling GRE tunnels
MPLS capabilities (Advanced Feature License)
VPLS
BGP/MPLS VPNs Ethernet VPNs
Multicast Up to 256,000 IPv4 multicast routes
Up to 256,000 IPv6 multicast routes
Internet Group Management Protocol (IGMP) v1/v2/v3 
IGMP snooping
Multicast Listener Discovery (MLD) v1/v2
MLD snooping
Protocol Independent Multicast PIM-SM, PIM-SSM, PIM-DM Multicast Source Discovery Protocol (MSDP)
Firewall filters Ingress and egress L2-L4 access control lists (ACLs): 
Port ACLs
VLAN ACLs
Router ACLs Control plane denial-of-service (DoS) protection
Quality of service (QoS) 16,000 policers per chassis
8 egress queues per port
Weighted random early detection (WRED) scheduling
Weighted round-robin (WRR) queuing Strict priority queuing
Virtualization Integration with Juniper Contrail Platform
Integration with VMware NSX vSphere
Network virtualization protocols such as VXLAN 
VXLAN L2 and L3 gateway EVPN and VPLS for DCI
Management Junos OS CLI
Junos Space® Network Director
Junos XML management protocol
SNMP v1/v2/v3
RADIUS
TACACS+
Extensive MIB support
Firewall-based port mirroring
Link Layer Discovery Protocol (LLDP) Advanced Insight Solutions (AIS)

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