甚麼是Bypass Switch?

隨著資安問題持續受到重視，現代化網路中通常都會部署用In-line串接方式接續網路的監控系統，像IPS (Intrusion Prevention Systems) 、頻寬管理器、頻寬加速器、Proxy或是橋接裝置如VPN閘道器或防火牆等，因為這些串接設備加入，而他們本身發生故障的風險，提高了網路斷線的可能性。這對於重要網路服務的提供者，則必須要去思考暨要監控又要如何確保網路服務不中斷?

在網路與In-link串接設備之間，部署Bypass Switch，能夠確保您重要網路通道暢通，而無關於您In-line串接裝置的效能。當 Bypass Switch察覺到In-line設備失去電力、處理網路流量的Latency過久或流量已經被In-line設備阻塞時，則自動(或手動)開啟bypass的旁路機制，此時網路流量不再進入In-link設備，由Bypass Switch直接將流量繞向In-line設備後方的網路，直到偵測出故障的in-line裝置恢復正常，才將流量再自動(或手動)繞回。

如此一來，網管人員就不需要因為網路斷線而疲於奔命，而好的Bypass Switch亦能發出事件告知管理者，讓他第一時間掌握狀況。雖然一些先進的In-line設備的NIC可能也提供bypass功能，但只在斷電時有作用，對於當機或Latency時間過長等問題則無法啟動bypass機制。

Interface Masters優勢??

Interface Masters Bypass Switch 是一個容易管理、當in-line串接設備危機發生能主動提供流量旁路的智慧型設備。每個Bypass Switch提供一至數個獨立網段(segment)模組，並具有銅纜與光纖，或光纖轉換銅纜、單模光纖轉換多模的介面可供選擇。每個網段模組能夠獨立作業，亦能聯合幾個網段一起作業，隨時保持與監控網路連通性，以及支援網管功能，讓管理者及時掌握bypass發生的情況。資料以線速(line-rate)即時傳輸，確認重要語音與應用的封包資料能夠連續傳送，以達到高品質與高安全性的需求。對於部署in-line串接模式監控設備的網路而言，Niagara Bypass Switch提供一個完善的保護方案。

Heartbeat模式
Niagara Bypass Switch藉由傳送與接收一種heartbeat封包的方式，來監視in-line裝置的連通狀態。可設定之Heartbeat封包，穿越in-line裝置網路介面並計算延遲時間或遺失的狀態，能夠去判斷監控設備系統處理高流量所造成的延遲情形。即使in-line設備仍是開啟著電源並作業當中，Bypass Switch仍然可因為延遲時間超過設定門檻，自動切換路由並將流量直接繞道後方網路，直到察覺in-line設備延遲時間恢復正常，再將流量切回導入設備。

Niagara Bypasss Switch的heartbeat封包格式，可以設定為Etherfram、ICMP或IPX。

Passive模式
在沒有供電的情況下，Bypass Switch兩個網路埠內的電路會自動合上，並產生一個實體路由，讓網路繼續暢通。

健全的管理、安全性與記錄
內建的CLI或GUI操作介面管理介面，包括使用HTTPs的網路安全介面。支援Secure Shell (SSH), SNMP, e-mail通知，TACACS+以及Syslog，使更能夠強化記錄資料，特別是從多個系統資料集中到一個管理設備中。

可靠度與易於使用
Niagara 1G/10G Bypass Switch具備容易部署、串接設備可隨時插拔、與各主要廠牌皆相容的特性。每個Bypass Switch不但具備雙備援電源供應，並且連續監控電壓是否瞬間下降或中斷。一旦發生，則立刻切換到Passive模式，以保障網路暢通。

Niagara Bypass Switch是單純的以保障網路連通的可靠度而設計，不同於複雜的IPS等串接設備，需要消耗大量硬體效能來深入分析封包內容，有鑑於此Niagara Bypass Switch一旦安裝上了網路，需要離開網路進行維護的可能性是微乎其微。

Interface Masters Bypass Switch熱門產品型號訂購資訊：

(更多型號請洽業務人員)

Active Bypass Switch
No.	Product Name	Description
1Gb External Bypass Switch - One Segment (no TAP port)
1	Niagara 2294-TX	1Gb 1 segment Desktop External Active Bypass Switch - Copper
2	Niagara 2294-SX	1Gb 1 segment Desktop External Active Bypass Switch - Fiber SX
3	Niagara 2294-LX	1Gb 1 segment Desktop External Active Bypass Switch - Fiber LX
1Gb External Bypass Switch - One Segment (1U - with TAP Port)
5	Niagara 2297-TX	1Gb 1 segment External Active Bypass Switch w/TAP - Copper-1U
6	Niagara 2297-SX	1Gb 1 segment External Active Bypass Switch w/TAP - Multi-Mode Fiber -1U
7	Niagara 2297-LX	1Gb 1 segment External Active Bypass Switch w/TAP - Single-Mode Fiber -1U
8	Niagara 2297-TX-SX	1Gb 1 segment External Active Bypass Switch w/TAP - Multi-Mode Fiber to Copper conversion -1U
9	Niagara 2297-TX-LX	1Gb 1 segment External Active Bypass Switch w/TAP - Single-Mode Fiber to Copper conversion -1U
1Gb External Bypass Switch - Two Segment (1U - with TAP Port)
11	Niagara 2299-2TX	1Gb 2 Copper Segments Active Bypass w/TAP - 1U
12	Niagara 2299-2SX	1Gb 2 Multi-Mode Fiber Segments Active Bypass - w/TAP - 1U
13	Niagara 2299-2LX	1Gb 2 Single-Mode Fiber Segments Active Bypass - w/TAP - 1U
14	Niagara 2299-2SXTX	1Gb 2 Multi Mode and two Copper Segments Active Bypass - 1U
15	Niagara 2299-2SXLX	1Gb External bypass system, two SX to LX conversion segments
16	Niagara 2299-2LXTX	1Gb Two Single-Mode Fiber and two Copper Segments Active Bypass  - 1U
1Gb External Bypass Switch - Three Segment (1U - with TAP Port)
18	Niagara 2299-3TX	1Gb 3 Copper Segments External Active Bypass, 1U
19	Niagara 2299-3SX	1Gb 3 Multi Mode fiber  Segments External Active Bypass, 1U
20	Niagara 2299-3LX	1Gb 3 Single Mode fiber Segments External Active Bypass, 1U
21	Niagara 2299-3SXTX	1Gb external bypass - 3 multi-mode to copper conversion
22	Niagara 2299-3SXLX	1Gb external bypass system, 3 SX to LX conversion segments
23	Niagara 2299-3LXTX	1Gb external bypass - 3 Single mode to copper conversion
1Gb External Bypass Switch - Four segement (1U - with TAP Port)
25	Niagara 2299-4TX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Copper Segments Active Bypass - 1U
26	Niagara 2299-4SX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Multi-Mode Fiber Segments Active Bypass - 1U
27	Niagara 2299-4LX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Single-Mode Fiber Segments Active Bypass - 1U
28	Niagara 2299-4SXTX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Multi-Mode Fiber to Copper conversion Segments Active Bypass - 1U
29	Niagara 2299-4LXTX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Single-Mode Fiber to copper conversion Segments Active Bypass - 1U
30	Niagara 2299-4SXLX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Four Single-Mode Fiber to Multi Mode fiber conversion Segments Active Bypass - 1U
31	Niagara 2299-3SX-LX	1Gb 4 segments External Active Bypass Switch- 1U - with TAP port - 3 SX segment and 1 LX segment
32	Niagara 2299-2SX-2TX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - with 2 Multi-Mode Fiber segments and 2 Copper Segments - 1U
33	Niagara 2299-2LX-2TX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - with 2 Single-Mode Fiber segments and 2 Copper Segments - 1U
34	Niagara 2299-2TX-SX-LX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - 2 cooper segments, 1 SX segment and 1 LX segment - 1U
35	Niagara 2299-2SX-2SXTX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Two Multi-Mode Fiber Segments and two Multi-Mode Fiber to Copper conversion Segments  Active Bypass - 1U
36	Niagara 2299-3TX-LXSX	1Gb 4 segments External Active Bypass Switch- w/  TAP port - Three copper segments and one Single Mode fiber to Multi Mode fiber conversion segment Active Bypass - 1U
10Gb External Bypass Switch - one segment
38	Niagara 2812-SR	10Gb 1 Segment External Multi-mode Fiber Intelligent Bypass Switch
39	Niagara 2812-LR-SR	10Gb 1 Segment External Single-mode to Multi-mode Fiber Intelligent Bypass Switch
40	Niagara 2812-LR	10Gb 1 Segment External Single-mode Fiber Intelligent Bypass Switch
41	Niagara 2812-ER-SR	10Gb 1 Segment External Extended Rich to Multi-mode Fiber Intelligent Bypass Switch
42	Niagara 2812-ER	10Gb1 Segment External Extended Rich Fiber Intelligent Bypass Switch
10Gb External Bypass Switch - Two segment
44	Niagara 2814-SR	10Gb 2 Segments External Multi-mode Fiber Intelligent Bypass Switch
45	Niagara 2814-LR	10Gb 2 Segments External Single-mode Fiber Intelligent Bypass Switch
10Gb External Bypass Switch - four segment
47	Niagara 2818-SR	10Gb 4 Segments External Multi-mode Fiber Intelligent Bypass Switch (includes SFPs only on Network ports)
48	Niagara 2818-LR	10Gb 4 Segments External Single-mode Fiber Intelligent Bypass Switch  (includes SFPs only on Network ports)
49	Niagara 2818-ER	10Gb 4 Segments External Extended Rich Fiber Intelligent Bypass Switch  (includes SFPs only on Network ports)
50	Niagara 2818-2SR-2LR	10Gb 4 Segments External 2 SR Segments and 2 LR Segments Intelligent Bypass Switch (includes SFPs only on Network ports)
10Gb External Bypass Switch - one segment with TAP port
52	Niagara 2812T-SR	10Gb 1 Segment External Multi-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (SFP Excluded)
53	Niagara 2812T-LR-SR	10Gb 1 Segment External Multi-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (SFP Excluded)
54	Niagara 2812T-LR	10Gb 1 Segment External Singlei-mode Fiber Intelligent Bypass Switch with Mirroring Ports(SFP Excluded)
10G External Bypass Switch - Two segment with TAP port
56	Niagara 2814T-SR	10Gb 2 Segments External Multi-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (SFP excluded)
57	Niagara 2814T-LR	10Gb 2 Segments External Single-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (SFP excluded)
10G External Bypass Switch - four segment with TAP ports
59	Niagara 2818T-SR	10Gb 4 Segments External Multi-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (includes SFPs only on Network ports)
60	Niagara 2818T-LR	10Gb 4 Segments External Single-mode Fiber Intelligent Bypass Switch with 7 Mirroring Ports (includes SFPs only on Network ports)
61	Niagara 2818T-ER	10Gb 4 Segments External Extended Rich Fiber Intelligent Bypass Switch with 7 Mirroring Ports (includes SFPs only on Network ports)
62	Niagara 2818T-2SR-2LR	10Gb 4 Segments External 2 Multi-mode and 2 Single-mode segment  Fiber Intelligent Bypass Switch with 7 Mirroring Ports (includes SFPs only on Network ports)
PacketMaster (Bypass with HLB)
	Product Name	Description
1G / 10G External Bypass Switch with Hardware Load Balancer - 1 segment with TAP ports
66	Niagara 2801-SR	Single segment Multi Mode active bypass system with packet control capabilities
67	Niagara 2801-LR	Single segment Single Mode active bypass system with packet control capabilities
1G / 10G External Bypass Switch with Hardware Load Balancer - 2 segment with TAP ports
68	Niagara 2802-SR	Dual segment Multi Mode active bypass system with packet control capabilities
69	Niagara 2802-LR	Dual segment Single Mode active bypass system with packet control capabilities
1G / 10G External Bypass Switch with Hardware Load Balancer - 4 segment with TAP ports
70	Niagara 2804-SR	Quad segment Multi Mode active bypass system with packet control capabilities
71	Niagara 2804-LR	Quad segment Single Mode active bypass system with packet control capabilities
1G / 10G External Bypass Switch with Hardware Load Balancer - 12 Segments with TAP ports
72	Niagara 3224PT-SR	12 SR segments TAP + 24 10GE port Loadblancer/Packet Master - No SFP+
73	Niagara 3224PT-LR	12 LR segments TAP + 24 10GE port Loadblancer/Packet Master - No SFP+
40G / 10G External Bypass Switch with Hardware Load Balancer - 1 segments with TAP ports
74	Niagara 4232-4XL	4 Port 40 Gigabit, 32 Port 10 Gigabit Hardware Packet Master + Advanced Traffic Management System