Cisco Catalyst 4500 Series Software Configuration Manual page 522

About Supervisor Engine Redundancy Synchronization
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SSO is compatible with the following list of features. However, the protocol database for these features
is not synchronized between the standby and active supervisor engines:
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The following features are learned on the standby supervisor engine if the SSO feature is enabled:
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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.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
12-4
Chapter 12 Configuring Supervisor Engine Redundancy Using RPR and SSO on Supervisor Engine 7-E, Supervisor
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
802.1Q tunneling with Layer 2 Protocol Tunneling (L2PT)
Baby giants
Jumbo frame support
CDP
Flood blocking
UDLD
SPAN/RSPAN
NetFlow
All Layer 3 protocols on Catalyst 4500 series switches (Switch Virtual Interfaces)