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1. #Cisco loopback test ethernet how to#
2. #Cisco loopback test ethernet serial#
3. #Cisco loopback test ethernet full#

In the event that the network is running unusually heavy loads that do not allow the processor the time to handle the routing protocols, more priority can be given to the system process scheduler using the scheduler-interval global configuration command. The normal operation of the network server allows the switching operations to use as much of the central processor as is required. Configuring Switching and Scheduling Priorities The following sections describe adjustments that apply to all interface types.

#Cisco loopback test ethernet serial#

These sample commands set the clock rate on the first serial interface to 64,000 bits per second. Use the no clockrate command to remove the clock rate if you change the interface from a DCE to a DTE device. To permit a faster speed, use an RS-449 or V.35 applique.

Cisco recommends you only use the synchronous serial RS-232 signal at speeds up to 64,000 bits per second. The argument speed is the desired clock rate, and may be one of any of the rates in Table 1-1.īe aware that the fastest speeds may not work if your cable is too long, and that speeds faster than 148,000 bits per second are too fast for RS-232 signaling.

#Cisco loopback test ethernet full#

The full syntax is as follows: clockrate speed You may configure the clock rate on the serial interface of the SCI and MCI cards to an acceptable bit rate using the clockrate interface subcommand. This command enables DTR pulse signals for three seconds on interface serial 2. The default interval is zero seconds, which is restored by the no pulse-time command. This function is useful for handling encrypting or other similar devices that use the toggling of the DTR signal to resynchronize. The argument seconds specifies the interval.When the serial line protocol goes down (for example, because of loss of synchronization) the interface hardware is reset and the DTR signal is held inactive for at least the specified interval. The pulse-time interface subcommand enables pulsing DTR signals on the Cisco MCI and SCI serial interfaces. The maximum number of flags between packets that can be transmitted on the IGS is 62 the minimum is 2. The argument hdlc-flags causes a minimum of HDLC flags to be sent between each packet. This command specifies a delay of 300 microseconds on interface serial 0.įor the serial interface on the IGS router and the High Speed Serial Interface (HSSI) on the AGS+, the command is specified as follows: transmitter-delay hdlc-flags

The default value is zero the no transmitter-delay command restores this default. The argument microseconds specifies the approximate number of microseconds of minimum delay after transmitting a datagram. Use the transmitter-delay interface subcommands to do this. Since the MCI and SCI interface cards can send back-to-back data packets over serial interfaces faster than some hosts can receive them, you can specify a minimum dead-time after transmitting a datagram using the following subcommand which is especially useful for serial interfaces. The following sections describe adjustments that can be made to serial interfaces. Adjusting Serial Interface Characteristics Once in the command collection mode, start configuring the interface by entering the interface command.Ī summary of the interface subcommands described in this chapter is included at the end of the chapter. To enter this mode, type the EXEC command configure at the EXEC prompt the configure command will place the system into the configuration command collection mode. To adjust or test an interface, you must be in the configuration command collection mode.

#Cisco loopback test ethernet how to#

This chapter describes how to make adjustments to-or how to fine tune-the router interfaces, and how to enable loopback tests. Interface Configuration Subcommand Summary Specifying the Maximum Packets in the Priority QueuesĪssigning a Priority Group to an InterfaceĬonfiguring Transmit Queue Limits on CSC-MCI and CSC-SCI CardsĮnabling Loopback on an UltraNet ConnectionĮnabling Loopback on MCI and SCI Serial CardsĮnabling Loopback on MCI and MEC Ethernet CardsĮnabling Loopback on the CSC-FCI FDDI Card Table of Contents Adjusting Interface CharacteristicsĪdjusting Serial Interface CharacteristicsĪdjusting Characteristics That Apply to All Interface TypesĬonfiguring Switching and Scheduling Priorities