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Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 1 Overview
Features
Layer 3 Features
These are the Layer 3 features:
Note Some features noted in this section are available only on the IP services image.
• HSRP for Layer 3 router redundancy
• IP routing protocols for load balancing and for constructing scalable, routed backbones:
–
RIP Versions 1 and 2
–
OSPF (requires the IP services image)
–
Enhanced IGRP (EIGRP) (requires the IP services image)
–
Border Gateway Protocol (BGP) Version 4 (requires the IP services image)
• IP routing between VLANs (inter-VLAN routing) for full Layer 3 routing between two or more
VLANs, allowing each VLAN to maintain its own autonomous data-link domain
• 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 image)
• Fallback bridging for forwarding non-IP traffic between two or more VLANs (requires the IP
services image)
• Static IP routing for manually building a routing table of network path information
• Equal-cost routing for load balancing and redundancy
• Internet Control Message Protocol (ICMP) and ICMP Router Discovery Protocol (IRDP) for using
router advertisement and router solicitation messages to discover the addresses 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 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
• IPv6 unicast routing capability for forwarding IPv6 traffic through configured interfaces (requires
the advanced IP services image)
• 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.
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