Cisco C8510-SRP - Switch Route Processor Bedienungsanleitung PDF herunterladen (Seite 21)

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Multiple Queue Scheduling Disciplines for Frames and

Cells

• Strict Priority Custom, guaranteed ATM trafﬁc classes

• Speciﬁed Rate Guarantees peak rate for CBR (rate limiting),

minimum cell rate for ABR or UBR, and sustainable

cell rate for VBR

• Weighted Round Robin (WRR) Fair, differentiated delay probability for UBR or

NRT-VBR trafﬁc slasses, and for best effort with

multiple IP precedence levels or RSVP service classes

in Tag Switching networks

Intelligent Early Packet Discard • Supports early packet drop when user-deﬁned buffer

threshold(s) are exceeded

Maximizes goodput for bursty trafﬁc; multiple

thresholds used for weighted early packet discard offer

differentiated loss probability for UBR and for best

effort with multiple IP precedence levels or RSVP IP

service classes in MPLS/Tag Switching networks

Intelligent Tail (Partial) Packet Discard • Drops remaining cells of an AAL5 frame when any

cells are dropped after failing trafﬁc policing, or any

other event that causes cell loss

Improves goodput by not needlessly forwarding cells

of a partial frame and increases buffer utilization, thus

avoiding any further loss

Cell Tagging and Selective Cell Drop • Sets cell loss priority bit in cells that exceed buffer

thresholds or fail trafﬁc policing

Optimizes network utilization while minimizing

unnecessary cell loss

• Preferentially drops cells with CLP bit set Prioritizes dropping of non-conformant cells

Trafﬁc Policing (usage parameter control) per ITU-T

I.371 and ATM Forum UNI Speciﬁcations

• Uses dual leaky bucket algorithm Allows enforcement of trafﬁc contracts for all ATM

Forum-deﬁned trafﬁc types

Trafﬁc Pacing/Shaping • Allows cells to be paced out speciﬁc connections and

shaped VP tunnels at rates equal to or below the line

rate

Allows for rate-limited trafﬁc on public network

connections; 128 total VP tunnels can be shaped per

switch, each VP with up to 128 VCs each

Resource and Policy Connection Admission Control • Used in admitting and routing ATM connections Ensures that guarantees made to existing connections

or policies set by the administrator are honored when

setting up new connections

Table 8 Catalyst 8500 ATM Switching-Speciﬁc Features and Beneﬁts

Feature Comment/Description Beneﬁt

ABR Congestion Control • Supports EFCI and Relative Rate (RR) Ma

Catalyst 8510

• EFCI Marking standard on Catalyst 8540

support for RR and Explicit Rate via optio

daughter card on MSP

Trafﬁc Statistics • Wide variety of per-connection, per-port, a

per-switch statistics

LAN Emulation Services • LANE Conﬁguration Server (LECS), LAN

(LES), and Broadcast and Unknown Server

for Ethernet and Token Ring emulated LA

(supporting LUNI v1.0 or v2.0 clients); the

supports MPOA networks as well

Complete Network Redundancy • Cisco's standards-based SSRP and Hot Sta

Router Protocol (HSRP) for LANE and M

networks

RFC 1577 Classical IP over ATM • Supports ATM ARP server

ATM Forum CES v2.0 • Integrates voice and video with data trafﬁc

single ATM trunk

• Structured (n x 64) and Unstructured (Clear

Services

• On-hook suppression

Cisco Tag Switching (emerging IETF Multiprotocol

Label Switching)

• Special software license required for MPL

Switching; utilizes VC-merge optimization

ATM-Speciﬁc Services and Manageability

Mechanisms

F4 and F5 OAM Cell Flows • Segment or end-to-end ﬂows for both VCs

periodically or on demand; AIS and RDI s

Table 8 Catalyst 8500 ATM Switching-Speciﬁc Features and Beneﬁts

Feature Comment/Description

1 2 ... 16 17 18 19 20 21 22

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