Cisco 15454-TCC - Network Processor Card Uživatelský manuál stáhnout pdf (Strana 3)

The Cisco ML-Series cards offer an advanced set of quality-of-service (QoS) features to allow the network administrator to fine-tune the

network and create and support a wide range of SLAs. Some of the features and benefits are listed in Table 1.

Table 1. Features and Benefits for QoS

Feature Benefit

Flexible packet classification Classifies packets based on input port, VLAN, class of service (CoS), IP Precedence, or IP-differentiated services code points

(DSCPs), allowing the service provider to tailor packet handling based on the user’s traffic

Policing Through highly granular per-flow and input port policing, allows the service provider to contain a user to the SLA bandwidth

requirements, reducing the likelihood that a user will flood the network

Priority marking Provides a mechanism, when using either .1Q or Q, in Q features for a service provider to reclassify (mark) a packet with a

wrapper Ethernet 802.1p value, allowing downstream nodes to treat the packet differently and transparently transporting the

original CoS bits of the packet across a service provider network

Per-class queuing Provides fair access to excess network resources, allows allocation of bandwidth to support SLAs, and helps ensure that

applications with high network resource requirements are adequately serviced

Weighted Deficit Round-Robin

(WDRR) scheduling

Adds weighting capabilities to deficit round-robin scheduling to provide fair access to excess bandwidth as well as throughput

to each class

The Cisco ML-Series cards offer important advantages in service provider network architectures, permitting new, profitable services as

well as simplifying service activation. Some of these capabilities are outlined in Table 2.

Table 2. Features and Benefits for Service Provider Network Architectures

Feature Benefit

Admission control During service provisioning, the Cisco ML-Series card verifies that QoS resources have not been accidentally overcommitted.

Network scaling and flexibility The Cisco ML-Series cards support VLAN-ID translation. This capability allows the service provider to change the ingress VLAN

tags (802.1Q or 802.1Q in .1Q) to avoid VLAN collisions within the network (resulting from the use of the same VLAN ID by

different customers) and translate them back at the egress of the network.

Network resiliency Support for RPR or SONET/SDH provides resiliency of less than 50 ms for data services, depending on the service offering.

Efficient bandwidth use The use of RPR technology allows full use of the network bandwidth during normal network operation of a properly designed

network.

SLA management The Cisco IOS Software IP SLA tool monitors packet latency, jitter, and loss over metro optical networks or a combination of

metro optical and IP and Multiprotocol Label Switching (MPLS) networks. The IP SLA tool can be used with Cisco IOS Software

devices and other vendor devices. Comprehensive performance management statistics are provided at the interface or

subinterface level (VLAN) for proactive SLA tracking and network problem identification.

Packet over SONET/SDH (PoS)

virtual ports support

PoS support allows the service provider to transport Ethernet traffic originating on a Cisco ML-Series card over an optical

interface and terminate the signal on an optical port of existing Layer 2 and Layer 3 equipment, eliminating the need to bookend

the Cisco ML-Series cards within the network.

Reduced interface costs The use of the Cisco ML-Series cards and shared bandwidth transport allows the service provider to benefit from statistically

multiplexing the edge traffic before handing off a more efficiently filled interface to the core router or switch.

APPLICATIONS

The Cisco ONS 15454 ML-Series cards provide the flexibility to meet the demands of a wide variety of network applications found within

many service providers’ transport networks. The following figures show a few of the applications that can be cost-effectively deployed

using the Cisco ONS 15454 with the Cisco ML-Series cards.

Ethernet Service Delivery

The Cisco ONS 15454 with either the Cisco ML100X-8 or ML1000-2 Cisco ML-Series cards can be used for efficient 100BASE-FX and

Gigabit Ethernet service delivery over fiber to better reach customers from a central office or point of presence (POP), refer to Figure 2. In

addition, when the Cisco ONS 15454 with the Cisco ML-Series cards is placed in a telco wiring closet in the basement of a customer

building, fiber from the riser can be used to more efficiently deliver 100BASE-FX and Gigabit Ethernet services. Customers can use the

Cisco ML-Series cards to offer a wide range of Ethernet services with Layer 2 switching, RPR, and advanced QoS capabilities.

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