| Publisher | Cisco Systems | ||
|---|---|---|---|
| Format | 387.6KB PDF | Date added | 01 Oct 2007 |
| Topics | Switching, High Availability | ||
| Downloads | 1 | ||
The Cisco Catalyst 4500 E-Series provides several features that contribute to high availability. In-Service Software Upgrade (ISSU) allows Cisco Catalyst 4500 E-Series Switches to upgrade or downgrade software with less than 200 milliseconds loss of traffic. ISSU depends on Stateful Switchover (SSO), which maintains Layer 2 adjacencies during the switchover between an active and backup supervisor engine. Nonstop Forwarding (NSF) similarly maintains Layer 3 adjacencies between the Cisco Catalyst 4500 E-Series Switch and neighboring routers during a stateful switchover.
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