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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 8 Configuring Supervisor Engine Redundancy Using RPR and SSO
About Supervisor Engine Redundancy Synchronization
• 802.1D (Spanning Tree Protocol)
• 802.3af (Inline power)
• PAgP
• VTP
• Dynamic ARP Inspection
• DHCP snooping
• IP source guard
• IGMP snooping (versions 1 and 2)
• DTP (802.1q and ISL)
• MST
• PVST+
• Rapid-PVST
• PortFast/UplinkFast/BackboneFast
• BPDU guard and filtering
• Voice VLAN
• Port security
• Unicast MAC filtering
• ACL (VACLS, PACLS, RACLS)
• QoS (DBL)
• Multicast storm control/broadcast storm control
SSO is compatible with the following list of features. However, the protocol database for these features
is not synchronized between the redundant and active supervisor engines:
• 802.1Q tunneling with Layer 2 Protocol Tunneling (L2PT)
• Baby giants
• Jumbo frame support
• CDP
• Flood blocking
• UDLD
• SPAN/RSPAN
• NetFlow
The following features are learned on the redundant supervisor engine if the SSO feature is enabled:
• All Layer 3 protocols on Catalyst 4500 series switches (Switch Virtual Interfaces)
About Supervisor Engine Redundancy Synchronization
During normal operation, the persistent configuration (RPR and SSO) and the running configuration
(SSO only) are synchronized by default between the two supervisor engines. In a switchover, the new
active supervisor engine uses the current configuration.