Chapter 6 Configuring STP and RSTP on the ML-Series Card

Configuring STP and RSTP Features

Default STP and RSTP Configuration

Table 6-5shows the default STP and RSTP configuration.

Table 6-5

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

6-16

78-18133-01

 

 

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

The Cisco 15310-CL is a versatile platform that primarily serves as a carrier-class router aimed at supporting high-speed data and voice services. It is built to handle the demands of large enterprises and service providers, offering a robust design that ensures maximum uptime and performance. One of its standout features is its modular architecture, which enables users to customize their configurations based on specific application needs. This scalability allows for future expansion without the need for a complete hardware overhaul.

Key technologies integrated into the Cisco 15310-CL include high-density Ethernet interfaces and a comprehensive suite of Layer 2 and Layer 3 protocol support. The device is capable of supporting multiple types of connections, including TDM, ATM, and Ethernet. This flexibility makes it an ideal choice for organizations that require seamless migration between various service types. Moreover, with features such as MPLS (Multiprotocol Label Switching) support and advanced Quality of Service (QoS) mechanisms, the router ensures that critical applications receive the necessary bandwidth and low latency required for optimal performance.

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.

Both models benefit from Cisco's commitment to security and manageability, offering features like enhanced encryption protocols and user authentication mechanisms that help safeguard networks against threats. Additionally, they can be managed through Cisco’s intuitive software tools, simplifying configuration and monitoring tasks for IT administrators.

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.
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