Cisco WS-C3560G-24PS-E Manual de usuario descargar pdf (Pagina 8)

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Feature Benefit

• Distance Vector Multicast Routing Protocol (DVMRP) tunneling interconnects two multicast-enabled

networks across nonmulticast networks. EMI is required.

• Fallback bridging forwards non-IP traffic between two or more VLANs. EMI is required.

Integrated Cisco IOS Software

Features for Bandwidth

Optimization

• Per-port broadcast, multicast, and unicast storm control prevents faulty end stations from degrading overall

systems performance.

• IEEE 802.1d Spanning Tree Protocol support for redundant backbone connections and loop-free networks

simplifies network configuration and improves fault tolerance.

• PVST+ allows for Layer 2 load sharing on redundant links to efficiently use the extra capacity inherent in a

redundant design.

• IEEE 802.1s Multiple Spanning Tree Protocol (MSTP) allows a spanning-tree instance per VLAN, enabling

Layer 2 load sharing on redundant links.

• ECR provides load balancing and redundancy.

• Local Proxy Address Resolution Protocol (ARP) works in conjunction with Private VLAN Edge to

minimize broadcasts and maximize available bandwidth.

• VLAN1 minimization allows VLAN1 to be disabled on any individual VLAN trunk link.

• VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on VTP trunks by flooding

broadcast traffic only on trunk links required to reach the destination devices.

• IGMPv3 snooping provides fast client joins and leaves of multicast streams and limits bandwidth-intensive

video traffic to only the requestors.

• IGMP filtering provides multicast authentication by filtering out nonsubscribers and limits the number of

concurrent multicast streams available per port.

• Multicast VLAN registration (MVR) continuously sends multicast streams in a multicast VLAN while

isolating the streams from subscriber VLANs for bandwidth and security reasons.

QoS AND CONTROL

Advanced QoS

• Standard 802.1p CoS and 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, or Layer 4 TCP

or UDP port number.

• Cisco control- and data-plane QoS ACLs on all ports help ensure proper marking on a per-packet basis.

• Four egress queues per port enable differentiated management of up to four traffic types across the stack.

• SRR scheduling ensures differential prioritization of packet flows by intelligently servicing the ingress and

egress queues.

• Weighted tail drop (WTD) provides congestion avoidance at the ingress and egress queues before a

disruption occurs.

• Strict priority queuing guarantees that the highest-priority packets are serviced ahead of all other traffic.

• There is no performance penalty for highly granular QoS functions.

Granular Rate Limiting

• The Cisco Committed Information Rate (CIR) function guarantees bandwidth in increments as low as

8 kbps.

• Rate limiting is provided based on source and destination IP address, source and destination MAC address,

Layer 4 TCP and UDP information, or any combination of these fields, using QoS ACLs (IP ACLs or MAC

ACLs), class maps, and policy maps.

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