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Catalyst 3750 MetroSwitch Software Configuration Guide
78-15870-01
Chapter 1 Overview
Features
Policing and out-of-profile marking
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Two-rate traffic policing based on the committed information rate (CIR) and the peak
information rate (PIR)
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Out-of-profile markdown for packets that exceed bandwidth utilization limits (policy actions are to
send packets that conform without modification, to mark down the priority of packets that exceed,
and to drop packets that violate)
Egress queueing and scheduling
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Each packet assigned to an egress queue based on the traffic class and VLAN
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Weighted Random Early Detection (WRED) as the congestion-avoidance mechanism
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Class-based weighted fair queueing (CBWFQ) as a queue scheduling management feature to
provide guaranteed bandwidth to particular traffic classes, such as voice, that are delay
sensitive, while still fairly serving all other traffic in the network
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Low-latency queueing (LLQ) as a scheduling congestion-management feature to provide
strict-priority queueing for a traffic class and to enable delay-sensitive data, such as voice, to be
sent before packets in other queues are sent
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Traffic shaping to decrease the burstiness of Internet traffic
• Automatic QoS (auto-QoS) to simplify the deployment of existing QoS features by classifying
traffic and configuring egress queues (voice over IP only)
Layer 3 Features
• HSRP for Layer 3 router redundancy
• IP routing protocols for load balancing and for constructing scalable, routed backbones:
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RIP versions 1 and 2
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OSPF
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Interior Gateway Routing Protocol (IGRP) and Enhanced IGRP (EIGRP)
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Border Gateway Protocol (BGP) Version 4
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International Organization for Standardization (ISO) Connectionless Network Service (CLNS).
The switch supports ISO Interior Gateway Routing Protocol (IGRP) and Intermediate
System-to-Intermediate System (IS-IS) routing
• 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
• Fallback bridging for forwarding non-IP traffic between two or more VLANs
• 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.
• Multicast Source Discovery Protocol (MSDP) for connecting multiple PIM-SM domains
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