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

Configuring STP and RSTP Features

Default STP and RSTP Configuration

Table 7-5shows the default STP and RSTP configuration.

Table 7-5

Default STP and RSTP Configuration

 

 

 

 

Feature

 

Default Setting

 

 

 

Enable state

 

Up to 255 spanning-tree instances

 

 

can be enabled.

 

 

 

Switch priority

 

32768 + Bridge ID

 

 

Spanning-tree port priority (configurable on a per-interface

128

basis—used on interfaces configured as Layer 2 access ports)

 

 

 

Spanning-tree port cost (configurable on a per-interface basis)

100 Mbps: 19

 

 

10 Mbps: 100

 

 

STS-1: 37

 

 

 

Hello time

 

2 seconds

 

 

Forward-delay time

15 seconds

 

 

Maximum-aging time

20 seconds

 

 

 

Disabling STP and RSTP

STP is enabled by default on the native VLAN 1 and on all newly created VLANs up to the specified spanning-tree limit of 255. Disable STP only if you are sure there are no loops in the network topology.

Caution STP edge ports are bridge ports that do not need STP enabled—where loop protection is not needed out of that port or an STP neighbor does not exist out of that port. For RSTP, it is important to disable STP on edge ports, which are typically front-side Ethernet ports, using the command bridge bridge-group-numberspanning-disabledon the appropriate interface. If RSTP is not disabled on edge ports, convergence times will be excessive for packets traversing those ports.

Caution When STP is disabled and loops are present in the topology, excessive traffic and indefinite packet duplication can drastically reduce network performance.

Beginning in privileged EXEC mode, follow these steps to disable STP or RSTP on a per-VLAN basis:

 

Command

Purpose

Step 1

 

 

ML_Series# configure terminal

Enters the global configuration mode.

Step 2

 

 

ML_Series(config)# interface interface-id

Enters the interface configuration mode.

Step 3

 

 

ML_Series(config-if)# bridge-group

Disables STP or RSTP on a per-interface basis.

 

bridge-group-number spanning disabled

 

Step 4

 

 

ML_Series(config-if)# end

Returns to privileged EXEC mode.

 

 

 

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

7-16

78-19415-01

 

 

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Cisco Systems ONS 15310-CL manual Default STP and Rstp Configuration, Disabling STP and Rstp, Feature Default Setting
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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.
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