Two Cisco switches with 1 SUP and many 10G line-card ports for each switch, run in VSS mode. In which case or for what reason you don't connect all VSL to SUP?

The correct answer is A. The need for hardware diversity. In a VSS (Virtual Switching System) deployment, the VSL (Virtual Switch Link) carries inter-chassis control plane and data plane traffic between the two physical switches. If all VSL connections were homed exclusively to the Supervisor module (SUP), a SUP failure would bring…

Advanced Enterprise Campus Networks

Question

Options

AThe need for hardware diversity
BBandwidth congestion at SUP
CIn case the sup fail
DQos must be configured on both

How the community answered

(38 responses)

A
45% (17)
B
34% (13)
C
8% (3)
D
13% (5)

Explanation

In a VSS (Virtual Switching System) deployment, the VSL (Virtual Switch Link) carries inter-chassis control plane and data plane traffic between the two physical switches. If all VSL connections were homed exclusively to the Supervisor module (SUP), a SUP failure would bring down all VSL connectivity simultaneously, causing the entire VSS pair to lose communication. By distributing VSL connections across line cards as well (not just the SUP), you achieve hardware diversity (A)-the VSL can remain operational even if the SUP fails, because at least some VSL links are on separate hardware components. This is the primary design reason for spreading VSL connections.

Topics

#VSS#hardware diversity#SUP redundancy#Virtual Switch System

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