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Cisco VSS Dual-Active Detection

Posted by: Jim Marinelli on Jan 25, 2010

Tagged in: VSS , virtualization , Cisco 6500

Cisco VSS Dual-Active Detection - In my last blog, I explained how to configure VSS. In this article I’ll explain how to configure Dual-Active Detection. This is an important function of VSS because it prevents both supervisors from becoming active in event of a VSL link failure.

A VSS pair is connected by a VSL (virtual switch link). If the standby switch detects a complete loss of the VSL, it assumes the active chassis has failed and will take over as the active chassis. However, if the link has failed but the active chassis is still functioning, this can result in both chassis being in the active state. With both chassis routing packets and connected to upstream or downstream switches, black holes can occur.

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VSS Configuration

Posted by: Jim Marinelli on Dec 21, 2009

Tagged in: VSS , virtualization , Cisco 6500

Cisco VSS Configuration - Looking to install VSS ? Well, recently I had the opportunity to install VSS in a customer’s Data Center as part of a complete network migration from an old Nortel Switch network to a new Cisco network using primarily Catalyst 6509 switches with Sup 720 – 10 G Supervisors.

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