BLADE OS™ Application Guide HP GbE2c Ethernet Blade Switch for c-Class BladeSystem Version 5.1 Advanced Functionality Software
Table Of Contents
- Contents
- Figures
- Tables
- Preface
- Part 1: Basic Switching
- Accessing the Switch
- The Management Network
- Local Management Using the Console Port
- The Command Line Interface
- Remote Management Access
- Client IP Address Agents
- Securing Access to the Switch
- Setting Allowable Source IP Address Ranges
- RADIUS Authentication and Authorization
- TACACS+ Authentication
- LDAP Authentication and Authorization
- Secure Shell and Secure Copy
- Configuring SSH/SCP Features on the Switch
- Configuring the SCP Administrator Password
- Using SSH and SCP Client Commands
- SSH and SCP Encryption of Management Messages
- Generating RSA Host and Server Keys for SSH Access
- SSH/SCP Integration with Radius Authentication
- SSH/SCP Integration with TACACS+ Authentication
- End User Access Control
- Ports and Trunking
- Port-Based Network Access Control
- VLANs
- Spanning Tree Protocol
- RSTP and MSTP
- Link Layer Discovery Protocol
- Quality of Service
- Accessing the Switch
- Part 2: IP Routing
- Basic IP Routing
- Routing Information Protocol
- IGMP
- OSPF
- OSPF Overview
- OSPF Implementation in BLADE OS
- OSPF Configuration Examples
- Remote Monitoring
- Part 3: High Availability Fundamentals
- High Availability
- Layer 2 Failover
- Server Link Failure Detection
- VRRP Overview
- Failover Methods
- BLADE OS Extensions to VRRP
- Virtual Router Deployment Considerations
- High Availability Configurations
- High Availability
- Part 4: Appendices
- Index
BLADE OS 5.1 Application Guide
122 Chapter 6: RSTP and MSTP BMD00113, September 2009
Rapid Spanning Tree Protocol
Rapid Spanning Tree Protocol (RSTP) provides rapid convergence of the spanning tree and
provides for fast re-configuration critical for networks carrying delay-sensitive traffic such as voice
and video. RSTP significantly reduces the time to reconfigure the active topology of the network
when changes occur to the physical topology or its configuration parameters. RSTP reduces the
bridged-LAN topology to a single Spanning Tree.
For more information about Spanning Tree Protocol, see “Spanning Tree Protocol” on page 109.
RSTP parameters are configured in Spanning Tree Group 1. STP Groups 2-128 do not apply to
RSTP, and must be cleared. There are new STP parameters to support RSTP, and some values to
existing parameters are different.
RSTP is compatible with devices that run 802.1D Spanning Tree Protocol. If the switch detects
802.1D BPDUs, it responds with 802.1D-compatible data units. RSTP is not compatible with Per
VLAN Spanning Tree (PVST+) protocol.
Port State Changes
The port state controls the forwarding and learning processes of Spanning Tree. In RSTP, the port
state has been consolidated to the following: discarding, learning, and forwarding. Table 14
compares the port states between 802.1D Spanning Tree and 802.1w Rapid Spanning Trees.
Table 14 RSTP vs. STP Port states
Operational Status STP Port State RSTP Port State
Enabled Blocking Discarding
Enabled Listening Discarding
Enabled Learning Learning
Enabled Forwarding Forwarding
Disabled Disabled Discarding