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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02
Chapter1 Overview
Features
•Policy-based routing (PBR) for configuring defined policies for traffic flows
•Multiple VPN routing/forwarding (multi-VRF) instances in customer edge devices to allow service
providers to support multiple virtual private networks (VPNs) and overlap IP addresses between
VPNs (requires the IP services feature set)
•Fallback bridging for forwarding non-IP traffic between two or more VLAN s (requires the IP
services feature set)
•Static IP routing for manually building a routing table of network path information
•Equal-cost routing for load-balancing and redunda ncy
•Internet Control Message Protocol (ICMP) and ICMP Router Discovery Protocol (IRDP) for using
router advertisement and router solicitation messages to discover the addr esses of routers on directly
attached subnets
•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 feature set)
•Multicast Source Discovery Protocol (MSDP) for connecting multiple PIM-SM domains (requires
the IP services feature set)
•Distance Vector Multicast Routing Protocol (DVMRP) tunneling for interconnecting two
multicast-enabled networks across nonmulticast networks (requires the IP services feature set)
•DHCP relay for forwarding UDP broadcasts, including IP address requests, from DHCP clients
•IPv6 unicast routing capability for forwarding IPv6 traffic through configured interfaces (requires
the advanced IP services feature set)
•IP unicast reverse path forwarding (unicast RPF) for confirming source packet IP addresses.
•Nonstop forwarding (NSF) awareness to enable the Layer 3 switch to continue for warding packets
from an NSF-capable neighboring router when the primary r oute 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 feature set)
•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 (only Catalyst 3750-E switches)
Power over Ethernet Features
These are the Power over Ethernet (PoE) 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.