Configuring the Path Cost

Chapter 7 Configuring STP and RSTP on the ML-Series Card

Configuring STP and RSTP Features

The spanning-tree path cost default value is derived from the media speed of an interface. If a loop occurs, spanning tree uses cost when selecting an interface to put in the forwarding state. You can assign lower cost values to interfaces that you want selected first and higher cost values to interfaces that you want selected last. If all interfaces have the same cost value, spanning tree puts the interface with the lowest interface number in the forwarding state and blocks the other interfaces.

Beginning in privileged EXEC mode, follow these steps to configure the cost of an interface:

		Command	Purpose
Step 1
Step 1		ML_Series# configure terminal	Enters the global configuration mode.
Step 2
Step 2		ML_Series(config)# interface	Enters the interface configuration mode and specifies an
		interface-id	interface to configure.
			Valid interfaces include physical interfaces and port-channel
			logical interfaces (port-channelport-channel-number).
Step 3
Step 3		ML_Series(config-if)#	Configures the cost for an interface that is an access port.
		bridge-group	If a loop occurs, spanning tree uses the path cost when selecting
		bridge-group-number path-cost
		cost	an interface to place into the forwarding state. A lower path cost
			represents higher-speed transmission.
			For cost, the range is 0 to 65535; the default value is derived
			from the media speed of the interface.
Step 4
Step 4		ML_Series(config-if)# end	Returns to the privileged EXEC mode.


	Note	The show spanning-tree interface interface-idprivileged EXEC command displays information only
		for ports that are in a link-up operative state. Otherwise, you can use the show running-configprivileged
		EXEC command to confirm the configuration.

To return the interface to its default setting, use the no bridge-groupbridge-group-numberpath-costcost command.

Configuring the Switch Priority of a Bridge Group

You can configure the switch priority and make it more likely that the switch will be chosen as the root switch.

Cisco ONS 15310-CL, ONS 15310-MA, and ONS 15310-MA SDH Ethernet Card Software Feature and Configuration Guide, R9.1 and R9.2

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ONS 15310-CL, ONS 15310-MA, Cisco ONS 15310-MA specifications

Cisco Systems has long been a leader in networking and telecommunications technology, and among its impressive lineup of products, the Cisco ONS 15310 series stands out as an essential solution for optical networking. This series includes models such as the ONS 15310-MA, ONS 15310-CL, and ONS 15310-CA, each designed to meet the diverse needs of service providers and enterprises seeking to enhance their optical transport networks.

The Cisco ONS 15310-MA is an advanced multi-service platform designed for metropolitan area networks. It facilitates the seamless transport of data, voice, and video over optical networks. One of its main features is its ability to support a variety of interfaces, including Ethernet, SONET/SDH, and Wavelength Division Multiplexing (WDM), allowing users to integrate multiple services into a single platform. Additionally, the ONS 15310-MA supports advanced traffic management and Quality of Service (QoS) features to prioritize critical applications and ensure consistent performance.

The ONS 15310-CL variant is tailored for more specific applications, providing enhanced capabilities aimed at delivering carrier-grade services. It features a robust architecture that accommodates high-capacity traffic without compromising reliability. This model emphasizes low power consumption and a compact design, making it suitable for deployment in space-constrained environments. The ONS 15310-CL also supports a wide range of optical interfaces, making it highly flexible for various network configurations.

In terms of technologies, the Cisco ONS 15310 series leverages Optical Transport Network (OTN) capabilities, providing high efficiency and greater bandwidth utilization. OTN technology enables efficient error correction and adds resilience to the network through its built-in protection mechanisms. Furthermore, the series supports seamless integration with existing IP/MPLS networks, creating a cohesive infrastructure as organizations evolve their networking requirements.

One of the defining characteristics of the ONS 15310 series is its focus on scalability. Network operators can start with a modest deployment and gradually expand capacity as demand grows. This adaptability is complemented by Cisco's comprehensive management and monitoring tools, providing operators with real-time insights into network performance and facilitating proactive management.

In conclusion, the Cisco ONS 15310-MA and ONS 15310-CL models represent sophisticated solutions for modern optical networks. With their versatile features, advanced technologies, and robust design, they empower service providers and enterprises to build resilient, high-capacity networks that meet the demands of today’s data-driven world.

Cisco Systems Cisco ONS 15310-MA, ONS 15310-CL manual Configuring the Path Cost

Models: ONS 15310-CL ONS 15310-MA Cisco ONS 15310-MA