Ingress Queue Types, 42-24 | Cisco Systems OL-4266-08 guide

Chapter 42 Configuring PFC QoS

Understanding How PFC QoS Works

Figure 42-10illustrates the drop thresholds for a 1q4t ingress LAN port. Drop thresholds in other configurations function similarly.

Figure 42-10 Receive Queue Drop Thresholds

Drop threshold 4: 100%

Reserved for CoS 6 and 7

Reserved for CoS 4 and higher

Reserved for CoS 2 and higher

Available for traffic with any CoS value

Drop threshold 3: 80%

Drop threshold 2: 60%

Drop threshold 1: 50%

				C
				o
				S
					6
					a
			C		n
			C		d
				o	d
				o	7
				S
				4
		C		a
		C		d
		o		n
			S	5
C			2
C				n
o			a
	S		a
	S			d
		0		3
			a	3
			n
			d
			1

Traffic is dropped

100% available for CoS 6 and 7

80% available for CoS 4 and 5

Receive queue

60% available for CoS 2 and 3

50% available for CoS 0 and 1

(Default values shown)

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Ingress Queue Types

To see the queue structure of a LAN port, enter the show queueing interface {ethernet fastethernet gigabitethernet tengigabitethernet} slot/port include type command. The command displays one of the following architectures:

•1q2t indicates one standard queue with one configurable tail-drop threshold and one nonconfigurable tail-drop threshold.

•1q4t indicates one standard queue with four configurable tail-drop thresholds.

•1q8t indicates one standard queue with eight configurable tail-drop thresholds.

•2q8t indicates two standard queues, each with eight configurable tail-drop thresholds.

•8q4t indicates eight standard queues, each with four thresholds, each configurable as either WRED-drop or tail-drop.

•8q8t indicates eight standard queues, each with eight thresholds, each configurable as either WRED-drop or tail-drop.

•1p1q4t indicates:

–One strict-priority queue

–One standard queue with four configurable tail-drop thresholds.

	Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
42-24	OL-4266-08

OL-4266-08 specifications

Cisco Systems OL-4266-08 is a robust and versatile certification that focuses on the essentials of implementing and troubleshooting Cisco collaborations solutions. As enterprises increasingly rely on unified communications, having professionals who are knowledgeable in the latest Cisco technologies becomes a necessity. This certification is part of the Cisco Certified Network Associate (CCNA) program, which serves as a foundational stepping stone for individuals aspiring to build a career in networking and collaboration technologies.

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In conclusion, Cisco Systems OL-4266-08 equips networking professionals with the necessary skills to implement and support Cisco collaboration solutions. The focus on hands-on experience, along with in-depth coverage of technology and security protocols, makes it a valuable certification in the fast-paced world of network communications. With the rise of remote work and digital collaboration, this certification is pivotal for anyone looking to enhance their career in networking and technology.

Cisco Systems OL-4266-08 manual Ingress Queue Types, 42-24

Models: OL-4266-08