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Catalyst 3750 SwitchSoftware Configuration Guide
OL-8550-09
Chapter1 Overview
Features
•Protocol-Independent Multicast (PIM) for multicast routing within the network, allowing for
devices in the network to receive the multicast feed requested and for switches not participating in
the multicast to be pruned. Includes support for PIM sparse mode (PIM-SM), PIM dense mode
(PIM-DM), and PIM sparse-dense mode (requires the IP services image)
•Multicast Source Discovery Protocol (MSDP) for connecting multiple PIM-SM domains (requires
the IP services image)
•Distance Vector Multicast Routing Protocol (DVMRP) tunneling for interconnecting two
multicast-enabled networks across nonmulticast networks (requires the IP services image)
•DHCP relay for forwarding UDP broadcasts, including IP address requests, from DHCP clients
•DHCP for IPv6 relay, client, server address assignment and prefix delegation
•IPv6 unicast routing capability for forwarding IPv6 traffic through configured interfaces (requires
the IP services image)
•IPv6 default router preference (DRP) for improving the ability of a host to select an appropriate
router
•Nonstop forwarding (NSF) awareness to enable the Layer 3 switch to continue forwarding packets
from an NSF-capable neighboring router when the primary route processor (RP) is failing and the
backup RP is taking over, or when the primary RP is manually reloaded for a nondisruptive software
upgrade (requires the IP services image)
•NSF-capable routing for OSPF and EIGRP that allows the switch to rebuild routing tables based on
information from NSF-aware and NSF-capable neighbors.
•The ability to exclude a port in a VLAN from the SVI line-state up or down calculation
•Intermediate System-to-Intermediate System (IS-IS) routing supports dynamic routing protocols for
Connectionless Network Service (CLNS) networks.
Power over Ethernet Features
•Ability to provide power to connected Cisco pre-standard and IEEE 802.3af-compliant powered
devices from Power over Ethernet (PoE)-capable ports if the switch detects that there is no power
on the circuit.
•Support for CDP with power consumption. The powered device notifies the switch of the amount of
power it is consuming.
•Support for Cisco intelligent power management. The powered device and the switch negotiate
through power-negotiation CDP messages for an agreed power-consumption level. The negotiation
allows a high-power Cisco powered device to operate at its highest power mode.
•Automatic detection and power budgeting; the switch maintains a power budget, monitors and tracks
requests for power, and grants power only when it is available.
Monitoring Features
•EOT and IP SLAs EOT static route support identify when a preconfigured static route or a DHCP
route goes down
•Embedded event manager (EEM) for device and system management to monitor key system events
and then act on them though a policy)