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Table 1 shows protocols and features for high availability as of Cisco Catalyst OS version 7.5 that are supported, compatible,
and incompatible.
Table 1
High Availability Feature Support
Supported Features
COPS-DR and COPS-DR
Dynamic Trunk Protocol
Cisco Express Forwarding and adjacency
tables
Private VLANs
Router access control lists (ACLs)
Multilayer switching (MLS)
Port Aggregation Protocol/Link
Aggregation Protocol (PAgP/LACP)
Quality-of-service (QoS) ACLs and
policers
Switched Port Analyzer (SPAN)
STP
Trunking
UniDirectional Link Detection (UDLD)
protocol
VLAN ACLs
VLAN Trunking Protocol (VTP)
Port Security
802.1X
For a current list of the features that are supported with the High Availability feature, see the "Configuring Redundancy"
chapter of the Cisco Catalyst 6500 Series Software User Guide and the release notes.
Many Layer 3 and Layer 4 protocols or features are programmed into the application-specific integrated circuits (ASICs) of
the PFC or PFC2 on board the supervisor engine. Examples of these include access lists (router- and VLAN-based),
forwarding tables (multilayer switching cache and Cisco Express Forwarding tables), and QoS settings. The protocols are
maintained in the protocol database and will continue to be switched in hardware when a supervisor engine failover occurs.
Some of these are dependent on a dual MSFC configuration, which is discussed later in this paper.
The protocol state database, depicted in Figure 2 below, is a repository of up-to-date protocol state information. It is generated
by the active supervisor and stored by the standby supervisor. The database contains specific system information including
module and port states, VLAN information, nonvolatile RAM (NVRAM) configurations, and various protocol-specific data.
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Compatible Features
ASLB
Cisco Discovery Protocol
GMRP
Internet Group Management Protocol
(IGMP) snooping
Remote Monitoring (RMON)
Resource Reservation Protocol (RSVP)
Simple Network Management Protocol
(SNMP)
Telnet sessions
VTP pruning
Uplinkfast
Cisco Systems, Inc.
Page 7 of 19
Incompatible Features
Dynamic VLANs
Generic VLAN Registration Protocol
(GVRP)
Protocol filtering