Arista 7800R4 (1.6T Ethernet Switch・2024年)（アリスタ7800）

概要

Arista 7800R4 は、2024年Q4 Arista Networks (米Santa Clara・2004年Andy Bechtolsheim (Sun Microsystems Co-founder・Google早期投資家・Bechtolsheim Bedrock Capital) + David Cheriton (Stanford CS Professor・Sun Co-founder・Google早期投資家) 共同創業・Data Center / Hyperscaler Ethernet switch specialized vendor・Microsoft Azure / Meta / Hyperscaler Top customer base・累計売上$5B+/year・Arista Networks Industry-leading position) が発表したWorld-first 1.6T Ethernet Switch product line・前世代Arista 7800R3 (Broadcom Tomahawk 5 + Jericho 3-AI integration switches・2023年Q3 GA) のRefresh + 1.6T port adoption + Higher capacity Multi-chip integration。Broadcom Jericho 3-AI (AI Ethernet Fabric chip・28.8 Tbps switching + AI workload optimization) + Broadcom Tomahawk 5 (Top-of-Rack chip・51.2 Tbps switching) multi-chip integration design + 51.2 Tbps capacity per chassis (multi-chip integration via Broadcom switch chips) + 800G port standard + 1.6T port (Future road・2026年-2027年 Industry availability・World-first 1.6T port availability among Ethernet switches) + EOS (Arista Extensible Operating System・Modular Linux-based switching OS・Hyperscaler operator preferred) + Cloud Vision automation (Multi-rack data center management software) + Hyperscaler (Microsoft Azure + Meta + Oracle Cloud + Google Cloud partial)主軸採用 + Cisco Nexus 9800 / Juniper PTX10008 (Service provider switches direct competitor) との Hyperscaler customer share競合・Arista 7800R4 = World-first 1.6T Ethernet Switch product line position確立。

主な特徴・仕組み

• Form Factor: Modular chassis (16-slot / 24-slot / 32-slot variants)
• Capacity: 51.2 Tbps per chassis (multi-chip integration)
• Switch Chips: Broadcom Jericho 3-AI + Tomahawk 5 multi-chip integration
• Port Configurations: 800G port standard + 1.6T port future support (2026-2027年 availability)
• OS: EOS (Arista Extensible Operating System・Modular Linux-based)
• Cloud Vision: Multi-rack data center management software
• RoCEv2 / Adaptive Routing: Industry-leading AI fabric features (Broadcom Jericho 3-AI inherits)
• Use Cases: Hyperscaler AI cluster Ethernet fabric + Service provider backbone
• Power: 5-15 kW per chassis (form factor dependent)
• Hyperscaler Adopters: Microsoft Azure + Meta + Oracle Cloud + Google Cloud (partial)
• Pricing: $50,000-$500,000 per chassis (form factor + chip configuration dependent)

スペック比較表

具体例・対応製品

• Arista 7800R4 16-slot chassis: $50,000-$200,000 (configuration dependent)
• Arista 7800R4 32-slot chassis: $200,000-$500,000 (Largest form factor)
• Arista 7800R3 (前世代・2023年Q3): $40,000-$300,000・25.6 Tbps + 400G ports
• Arista 7280R3 (Mid-tier): $20,000-$100,000・Lower capacity ToR / EoR switches
• 競合 NVIDIA Spectrum-X800 SN5800: NVIDIA Spectrum-X marketing brand + Same Broadcom chip foundation

自作PCでの選び方・注意点

Arista 7800R4 は「Hyperscaler AI training cluster Ethernet fabric (Microsoft Azure + Meta + Oracle Cloud)」「Service Provider backbone routing (Tier-1 carriers)」「Multi-chip integration switch (Broadcom Jericho 3-AI + Tomahawk 5 hybrid)」用途のEnterprise tier Ethernet switch。Consumer / 自作PC範囲外・Hyperscaler data center / Service provider backbone deployment専用・Arista Networks Industry-leading Hyperscaler Ethernet switch position (Microsoft Azure長期Strategic partner + Meta major customer + Oracle Cloud + Google Cloud partial) で AI training cluster Ethernet fabric defacto standard vendor位置・Cisco Nexus 9800 / Juniper PTX10008 (Service provider switches with similar capacity) 直接競合・EOS (Arista Extensible Operating System・Modular Linux-based switching OS・Hyperscaler operator preferred for automation + Customization) は Cisco NX-OS / Junos OS と異なる operator preference key differentiator・Cloud Vision automation で Multi-rack data center scale operations alignment。

関連用語との違い

• vs NVIDIA Spectrum-X800: AristaはMulti-chip integration + Hyperscaler customers (Microsoft Azure等)・NVIDIAはNVIDIA branded + Same Broadcom chip foundation
• vs Cisco Nexus 9800 / Juniper PTX10008: AristaはEOS + Hyperscaler-focused・Cisco/JuniperはService provider focused + Different OS
• vs Arista 7800R3 (前世代): 7800R4は51.2 Tbps + 800G/1.6T・7800R3は25.6 Tbps + 400G port

よくある質問（FAQ）

Q1: 1.6T Ethernet port 実用化 timing は？ A: 2026-2027年Industry availability予想・Arista 7800R4 World-first 1.6T port product line但 actual 1.6T transceivers limited availability (Industry standardization進行中・1.6T PAM4 224 GBaud transceiver development)・Initial deployment 2026-2027年Q1-Q2予定。

Q2: Arista vs Cisco vs Juniper どちら？ A: Hyperscaler customers (Microsoft Azure + Meta + Oracle Cloud) Ethernet preferred → Arista・Service Provider carriers (AT&T + Verizon + Vodafone等) → Cisco / Juniper・Enterprise data center hybrid use → Mixed deployment。Customer Strategic alignment important。

Q3: EOS vs Cisco NX-OS vs Junos OS 違いは？ A: EOS = Arista Linux-based modular + API-first + Hyperscaler automation preferred・Cisco NX-OS = Cisco proprietary + Service provider Long-term stability + Enterprise integration・Junos OS = Juniper FreeBSD-based + Service provider routing focused + Enterprise edge networks。

まとめ

Arista 7800R4 = 2024年Q4 Arista Networks発表のWorld-first 1.6T Ethernet Switch product line。Broadcom Jericho 3-AI + Tomahawk 5 multi-chip integration + 51.2 Tbps capacity + 800G/1.6T port + EOS + Cloud Vision automation・Hyperscaler (Microsoft Azure + Meta) AI cluster Ethernet fabric主軸採用 + Cisco/Juniper Service provider competitor。