Datasheet

Data Sheet
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information. Page 10 of 18
Multicast
Efficient Multicast
Distribution
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Multicast VLAN Registration provides efficient multicast distribution in ring networks by
dedicating a single VLAN for multicast traffic, thereby removing duplicate multicast traffic in
other VLANs.
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PIM-SM provides efficient routing of multicast traffic by establishing distribution trees across
WANs.
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Source Specific Multicast (SSM) reduces the need for IP Multicast address management and
prevents DoS attacks against receivers.
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SSM mapping provides a mapping of source to group, which allows listeners to find/connect
to multicast sources dynamically, reducing dependencies on the application.
Robust Multicast Control
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IGMP Snooping helps enable intelligent management of multicast traffic by examining IGMP
messages.
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IGMP Fast Leave provides a fast channel-changing capability for IPTV services.
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IGMP filtering provides control of groups each user can access.
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IGMP Throttling controls the maximum number of multicast groups each user can access.
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IGMP Proxy allows users anywhere on a downstream network to join an upstream sourced
multicast group.
QoS and Control
Advanced QoS
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Standard 802.1p class of service (CoS) and differentiated services code point (DSCP) field
classification are provided, using marking and reclassification on a per-packet basis by source
and destination IP address, source and destination MAC address, VLAN ID, or Layer 4
TCP/User Datagram Protocol (TCP/UDP) port number.
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Cisco control-plane and data-plane QoS ACLs on all ports help ensure proper marking on a
per-packet basis.
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Shaped Round Robin (SRR) scheduling helps ensure differential prioritization of packet flows
by intelligently servicing the queues.
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Weighted Tail Drop (WTD) provides per QoS class congestion avoidance at the queues
before a disruption occurs.
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Priority queue rate limiting provides optional protection against lower priority queue starvation.
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The ES ports offer the following additional functionalities:
Hierarchical QoS with traffic classification, policing, queuing, shaping, and scheduling at the
class, VLAN, and interface level
Traffic classification based on MPLS experimental (EXP) bits
2 Rate 3 Color policing
WRED (Weighted Random Early Detection) for congestion avoidance
Class-Based Weighed Fair Queuing (CBWFQ) for bandwidth management
Low-Latency Queue provides strict-priority queuing for delay sensitive data
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Configurable control plane queue assignment allows service providers to assign control plane
traffic to specific egress queue.
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Prioritization of control plane traffic enables service providers to set QoS markings globally for
CPU-generated traffic so these protocol packets will receive priority in the network.
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There is no performance penalty for advanced QoS functionalities.
Advanced Traffic Control
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Upstream and downstream traffic flows from the end station or the uplink are easily managed
using ingress policing and egress shaping.
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Ingress policing provides bandwidth monitoring in increments as low as 8 kbps.
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Ingress policing is provided based on CoS, VLAN ID, DSCP, and QoS ACLs (IP ACLs or
MAC ACLs), which can include source and destination IP address, source and destination
MAC address, Layer 4 TCP/UDP information, or any combination of these fields.
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Egress Weighted Fair Queuing guarantees the Committed Information Rate (CIR) between
traffic flows and queues.
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Egress shaping for each queue provides smooth traffic control of available bandwidth.
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Egress port rate limiting allows the service provider to control the traffic rate that is transmitted
out of the port.