Alcatel OS6400-24 Guía de usuario descargar pdf (Pagina 34)

August 2008

Page 34 of 55 OmniSwitch 6400------ Release 6.3.3.R01

• Alcatel-Lucent’s PVST+ interoperability mode is not compatible with a switch running in PVST mode.

• The same default path cost mode, long or short, must be configured the same way on all

switches.

RRSTP - Ring Rapid Spanning Tree Protocol (RRSTP) is complimentary to either the Rapid Spanning

Tree (RSTP) or the Multiple Spanning Tree Protocol (MSTP) but is designed to enhance convergence time

in a ring configuration when a link failure occurs. Note that RRSTP is supported only in a ring topology

where switches are connected point to point. In addition, there can be no alternate connections for the same

instance between any two switches within a ring topology.

RRSTP reduces convergence time by finding the bridge that hosts the alternate (ALT) port and

immediately changing the ALT port state to forwarding without altering the port state. This process quickly

enables the data path. The RRSTP frame travels from the point of failure to the ALT port in both

directions. The MAC addresses corresponding to the ports in the ring are flushed to make the data path

convergence time much faster. While RRSTP is already reacting to the loss of connectivity, the standard

BPDU carrying the information about the link failure is processed in normal fashion at each hop. When

this BPDU reaches the bridge whose ALT port is now in the "ALT FWD" state, due to RRSTP frame

processing, it updates the state of the two ports in the ring as per the STP standard.

RRSTP is only supported when the switch is configured in Flat mode (RRSTP or MSTP).

Switch Logging

The Switch Logging feature is designed to provide a high-level event logging mechanism that can be

useful in maintaining and servicing the switch. Switch Logging uses a formatted string mechanism to

process log requests from applications. When a log request is received, Switch Logging verifies whether

the Severity Level included with the request is less than or equal to the Severity Level stored for the appro-

priate Application ID. If it is, a log message is generated using the formatting specified by the log request

and placed on the Switch Log Queue, and Switch Logging returns control back to the calling application.

Otherwise, the request is discarded. The default output device is the log file located in the Flash File

System. Other output devices can be configured via Command Line Interface. All log records generated are

copied to all configured output devices.

Command Line Interface can be used to display and configure Switch Logging information. Log informa-

tion can be helpful in resolving configuration or authentication issues, as well as general errors.

Syslog to Multiple Hosts - Sending syslog files to multiple hosts is allowed. It is possible to specify up to

a maximum of four servers.

Trivial File Transfer Protocol (TFTP) Client

TFTP, a client-server protocol, is used to transfer files between a TFTP server and client. TFTP client

functionality on the OmniSwitch is used to download files from or upload files to a TFTP server.

Text File Configuration

The text file configuration feature allows you to configure the switch using an ASCII-based text file. You

may type CLI commands directly into a text document to create a configuration file. This file resides in the

switch’s file system. You can create configuration files in the following ways.

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Alcatel OS6400-24 Guía de usuario Pagina 34