Configuring the Path Cost

Chapter 6 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 and Cisco ONS 15310-MA Ethernet Card Software Feature and Configuration Guide R8.5

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15310-CL, 15310-MA specifications

Cisco Systems has established itself as a leader in the networking domain, offering a wide array of solutions to meet the needs of modern businesses. Among its impressive product lineup are the Cisco 15310-CL and 15310-MA routers, designed to provide advanced network performance and reliability.

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In contrast, the Cisco 15310-MA focuses on access solutions, providing a cost-effective entry point for businesses looking to enhance their network capabilities. It is well-suited for smaller offices or branch locations that need reliable connectivity without the expense and complexity associated with larger systems. The device supports a range of access methods and provides essential features like firewall capabilities, VPN support, and comprehensive security measures to protect sensitive data.

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The Cisco 15310-CL and 15310-MA are ideal solutions for businesses seeking to enhance their network infrastructure, ensuring firms can keep pace with evolving technology demands while maintaining a focus on security and performance. Their combination of advanced features, modular capabilities, and robust support makes them valuable assets in the networking landscape.

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

Models: 15310-CL 15310-MA