Manuals / Brands / Computer Equipment / Switch / HP / Computer Equipment / Switch

HP J3178A Spanning Tree Operation, Spanning Tree Protocol (STP), Operation Tree Spanning

1 112

Download 112 pages, 3.04 Mb

D

Spanning Tree Operation

	Spanning Tree Protocol (STP)
	The Switch 208/224 Management Module uses the IEEE 802.1d Spanning Tree
	Protocol (STP) to ensure that only one path at a time is active between any
	two nodes on the network. In networks where there is more than one physical
	path between any two nodes, STP ensures a single active path between them
	by blocking all redundant paths.
	STP is necessary in such networks because having more than one path
	between a pair of nodes causes loops in the network, which can result in a
	switch detecting the same node on more than one port. This results in
	duplication of messages, leading to a “broadcast storm” that can bring down
	the network.

N o t e	The default STP setting in the switch is “Off”. If you are using the switch to
	provide redundant network paths, you should reconfigure the Spanning Tree
	Protocol to “On”. Refer to “Spanning Tree Configuration” in chapter 4, “Con-
	figuring the Switch From the Console” for procedures on enabling STP.
	While allowing only one active path through a network at any time, STP retains

	any redundant physical path to serve as a backup (blocked) path in case the
	existing active path fails. Thus, if an active path fails, STP automatically
	activates (unblocks) an available backup to serve as the new active path for
	as long as the original active path is down. In the event of a topology change
	such as a switch, bridge, or data link failure, STP develops a new spanning
	tree that may result in changing some switch ports from the blocking state to
	the forwarding state.
	For example, see the illustration on the next page.

Operation Tree Spanning

D-1

Contents

Installation and Reference Guide Page HP AdvanceStack Switch 208/224 Management Module Page HP Customer Support Services How to get the latest software/agent firmware j317801 World Wide Web HP FTP Library Service HP FIRST Fax Retrieval Service Additional HP Support Services 1Installing the Management Module 2Management Module Description 3The Switch Console 4Configuring the Switch From the Console 5Monitoring Switch Operation From the Console 6Using SNMP To Monitorand Manage the Switch 7Troubleshooting ASpecifications B Modem Configuration C File Transfers DSpanning Tree Operation Page Installing the Management Module the Management Module Included Parts Installation Steps C a u t i o n Anti-StaticPrecautions: Figure 1-2.Remove the cover plate Figure 1-3.Insert the Switch Management Module Removing the Module Management Module Description Management Module Description Self Test LED Console RS-232 Module Features Full-duplex port operation Address Aging Switch Console Page The Switch Console Connecting a Console to the Switch Default Serial Communication Settings Figure 3-1.Connecting a PC or Terminal to the Console RS-232Port Remote Console Connection Using a Modem and a PC Terminal Emulator or Terminal Figure 3-2.Example of Remote Access through a Modem Connection Modem Cable Pin-Out Starting and Ending a Console Session How To Start a Console Session: Note: Figure 3-3.The Main Menu How To End a Console Session: Main Menu Features Status and Counters: Configuration LOGOUT Advanced Commands Screen Structure and Navigation Figure 3-4.Elements of Screen Structure Table 3-1.How To Navigate in the Console Using Password Security To set Manager and Operator passwords: Figure 3-5.The Set Password Screen To Delete Password Protection: To Recover from a Lost Manager Password: To Recover from a Lost Operator Password: Rebooting the Switch Figure 3-6.The Reboot Switch Option in the Main Menu Figure 3-7.Example of a Configuration Change Requiring a Reboot Advanced Commands How To Use the Advanced Commands: time 9:55 How To Exit from the command prompt: Page Configuring the Switch From the Console Figure 4-1.Example Showing How To Display Help the Switch From Console the Configurable Features How To Access the Switch Configuration: Figure 4-2.The Configuration Menu System Configuration Port Configuration IPX Service (Optional) How To Configure IPX for Management from a Remote IPX Network Internet (IP) Service Using Bootp Bootp Operation The Bootp Process Bootp Database Record Entries where: Notes for the bootptab file: SNMP Communities Figure 4-8.The SNMP Communities Add or Edit Screen Trap Receivers Serial Link Configuration Console Configuration Spanning Tree Configuration Figure 4-12.Example of the STP Configuration Screen Network Monitoring Port Figure 4-14.Example of Selecting a Monitoring Port Saving Configurations Page Monitoring Switch Operation From the Console the Console Status and Counters Menu Figure 5-1.The Status and Counters Menu Switch Information Port Status Port Counters Port Counters - Show Details Address Table Port Address Table Figure 5-8.Example of a Port Address Table for a Specific Port Spanning Tree (STP) Information Figure 5-10.Example of STP Port Information Event Log Severity Date Time System Module Figure 5-11.Example of an Event Log Display Table 5-2.Event Log Control Keys Page Using SNMP To Monitor and Manage the Switch To Monitor and the Switch SNMP Management Features SNMP Configuration Process RMON EASE Troubleshooting Checking the Module LEDs Table 7-1.Switch Management Module LED Behavior Problem/Solution Table Table 7-2.Typical Switch Problems and Their Solutions Testing the Switch and Management Module Testing the Switch’s Ports and the Links IPXping Test Resetting the Switch Hardware reset: Clearing Passwords on the Switch Console N o t e Page Page Specifications Safety: Acoustic Noise: Not applicable Management Protocols Supported MIBS Communication Protocols Regulatory Statements Page Modem Configuration Modem Configuration US Robotics Courier V.FC/V.34 Megahertz XJ2288 PCMCIA card modem Practical Peripherals PM288MT II File Transfers Using TFTP To Download the OS File Figure C-2.Example of the Download OS Screen During a Download Using the SNMP-BasedHP Download Manager Using the Switch-to-SwitchDownload Using the Zmodem to Download the OS File Troubleshooting TFTP Downloads Figure C-3.Example of Message for Download Failure Page Transferring Switch Configurations Using Get and Put To Transfer a Configuration Between the Switch and a Networked PC or Unix Workstation Page Page Spanning Tree Operation Figure D-1.Example of Logical and Redundant Paths Between Two Nodes Spanning Tree Operation Index Index Page Page Page Page Page Page *5966-5228