Cisco Systems 6503 manual and incompatible

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	Compatible Features	Incompatible Features
COPS-DR and COPS-DR	ASLB	Dynamic VLANs
Dynamic Trunk Protocol	Cisco Discovery Protocol	Generic VLAN Registration Protocol
		(GVRP)
Cisco Express Forwarding and adjacency	GMRP	Protocol filtering
tables
Private VLANs	Internet Group Management Protocol
	(IGMP) snooping
Router access control lists (ACLs)	Remote Monitoring (RMON)
Multilayer switching (MLS)	Resource Reservation Protocol (RSVP)
Port Aggregation Protocol/Link	Simple Network Management Protocol
Aggregation Protocol (PAgP/LACP)	(SNMP)
Quality-of-service (QoS) ACLs and	Telnet sessions
policers
Switched Port Analyzer (SPAN)	VTP pruning
STP	Uplinkfast
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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