Cisco 6503 User Manual

Page 7

Cisco Systems, Inc.

Page 7 of 19

Table 1 shows protocols and features for high availability as of Cisco Catalyst OS version 7.5 that are supported, compatible,

and incompatible.

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.

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
tables

GMRP

Protocol filtering

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
Aggregation Protocol (PAgP/LACP)

Simple Network Management Protocol
(SNMP)

Quality-of-service (QoS) ACLs and
policers

Telnet sessions

Switched Port Analyzer (SPAN)

VTP pruning

STP

Uplinkfast

Trunking

UniDirectional Link Detection (UDLD)
protocol

VLAN ACLs

VLAN Trunking Protocol (VTP)

Port Security

802.1X