Cisco Systems 3750E manual Layer 3 Features

Chapter 1 Overview

Features

–Trusted boundary for detecting the presence of a Cisco IP Phone, trusting the CoS value received, and ensuring port security

•Policing

–Traffic-policing policies on the switch port for managing how much of the port bandwidth should be allocated to a specific traffic flow

–If you configure multiple class maps for a hierarchical policy map, each class map can be associated with its own port-level (second-level) policy map. Each second-level policy map can have a different policer.

–Aggregate policing for policing traffic flows in aggregate to restrict specific applications or traffic flows to metered, predefined rates

•Out-of-Profile

–Out-of-profile markdown for packets that exceed bandwidth utilization limits

•Ingress queueing and scheduling

–Two configurable ingress queues for user traffic (one queue can be the priority queue)

–Weighted tail drop (WTD) as the congestion-avoidance mechanism for managing the queue lengths and providing drop precedences for different traffic classifications

–Shaped round robin (SRR) as the scheduling service for specifying the rate at which packets are sent to the stack or internal ring (sharing is the only supported mode on ingress queues)

•Egress queues and scheduling

–Four egress queues per port

–WTD as the congestion-avoidance mechanism for managing the queue lengths and providing drop precedences for different traffic classifications

–SRR as the scheduling service for specifying the rate at which packets are dequeued to the egress interface (shaping or sharing is supported on egress queues). Shaped egress queues are guaranteed but limited to using a share of port bandwidth. Shared egress queues are also guaranteed a configured share of bandwidth, but can use more than the guarantee if other queues become empty and do not use their share of the bandwidth.

Layer 3 Features

These are the Layer 3 features:

Note Some features noted in this section are available only in the IP services feature set.

•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 feature set)

–Enhanced IGRP (EIGRP) (requires the IP services feature set)

–Border Gateway Protocol (BGP) Version 4 (requires the IP services feature set)

•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

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

OL-9775-02 1-11