/mcpData sheet Cisco public © 2025 Cisco and/or its affiliates. All rights reserved. - Flexlink+: Flexlink+ allows you to set up active and backup interfaces or port channels, which can provide Layer 2 failover redundancy without the use of Spanning Tree Protocol (STP). - Extended fast software upgrade provides the ability to upgrade the platform software or to reload the system in under 30 seconds of traffic impact, in both standalone and stack configurations.
IEEE 802.1s Multiple Spanning Tree Protocol (MSTP) provides rapid spanning tree convergence independent of spanning tree timers and also offers the benefit of Layer 2 load balancing and distributed processing.
Per-VLAN Rapid Spanning Tree (PVRST+) allows rapid spanning tree (IEEE 802.1w) reconvergence on a per- VLAN spanning tree basis, providing simpler configuration than MSTP. In both MSTP and PVRST+ modes, stacked units behave as a single spanning tree node.
Switch-port auto-recovery (“err-disable” recovery) automatically attempts to reactivate a link that is disabled because of a network error.
The Catalyst 9300 Series platform delivers an industry-leading non-stop forwarding (NSF)/stateful switchover (SSO) resiliency architecture in a stackable solution with sub-50-ms failover.