Important Features 
Supports all Cisco Catalyst 6500 Series modules, including:

• Supervisor engines
• Fast Ethernet modules (with IEEE 802.3af Power over Ethernet [PoE])
• Gigabit Ethernet modules (with IEEE 802.3af PoE)
• 10 Gigabit Ethernet modules
• Flex WAN modules
• Shared Port Adaptors/SPA Interface Processors
• Multi-Gigabit services modules (wireless, network analysis, and security)

The Cisco Catalyst 6504-E supports both Cisco Catalyst OS and Cisco IOS Software. It provides an additional slot for a redundant supervisor engine or extra module when compared to the Cisco Catalyst 6503-E Switch.

The Cisco Catalyst 6504-E provides maximum uptime with redundancy and rapid (1 to 3 seconds) stateful failover across supervisor engines. It supports modular Cisco IOS Software to minimize unplanned downtime through self-healing processes and simplifies software changes through subsystem in-service software upgrades.