Technical Debate: Why Bypass Mode is a Double-Edged Sword for Network Security Managers

I wanted to trigger a discussion on IAG architectural choices. We all know that deploying Sangfor IAG in Bypass Mode is incredibly attractive because it offers the smallest change to the existing network topology and has zero risk of causing network downtime if the hardware encounters an issue.  

However, we need to talk about its core functional limitations when it comes to true access management. By design, a core switch mirrors traffic to the IAG in Bypass Mode. Because of this, it is highly efficient for auditing and controlling TCP-based applications (like basic URL filtering).  

The Catch: It cannot naturally control or drop applications reliant on UDP communication, such as high-bandwidth P2P software or specific IM clients (like QQ login protocols).  

Conversely, Bridge Mode provides full, transparent visibility and allows us to execute active drops on UDP, though it requires inline risk mitigation (like relying on Hardware Bypass features during a device failure).  

Discussion Points for the Community:

• For those running IAG in Bypass Mode, what strategies or secondary policies (like switch-level ACLs or TCP resets) do you use to mitigate its native weakness against UDP apps?
• If a customer demands P2P bandwidth throttling but strictly refuses inline deployments (Bridge/Route Mode), how do you address their requirements using Sangfor's ecosystem?
• In what specific enterprise scenarios would you explicitly advise against Bypass Mode, despite the customer's fear of a network broadcast storm or downtime?
  
  

Let’s share our field experiences! Drop your deployment insights below.