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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 1 Overview
Features
• Weighted tail drop (WTD) as the congestion-avoidance mechanism for managing the queue lengths
and providing drop precedences for different traffic classifications
• Table maps for mapping DSCP, CoS, and IP precedence values
• Queuing and Scheduling
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Shaped round robin (SRR) traffic shaping to mix packets from all queues to minimize traffic
burst
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Class-based traffic shaping to specify a maximum permitted average rate for a traffic class
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Port shaping to specify the maximum permitted average rate for a port
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Class-based weighted queuing (CBWFQ) to control bandwidth to a traffic class
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WTD to adjust queue size for a specified traffic class
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Low-latency priority queuing to allow preferential treatment to certain traffic
Layer 2 Virtual Private Network Services
Layer 2 virtual private network (VPN) features are only available when the switch is running the metro
IP access or metro access image.
• IEEE 802.1Q tunneling enables service providers to offer multiple point Layer 2 VPN services to
customers
• Layer 2 protocol tunneling to enable customers to control protocols such as BPDU, CDP, VTP,
PAgP, LACP, and UDLD protocols to be tunneled across service-provider networks.
Layer 3 Features
Layer 3 features are only available when the switch is running the metro IP access image.
• 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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EIGRP
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BGP Version 4
• 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
• 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
