H3C S9500 Series Manual de usuario

Operation Manual – POS Port

H3C S9500 Series Routing Switches Table of Contents

Table of Contents

Chapter 1 POS Port Configuration ..............................................................................................1-1

1.1 POS Port Overview............................................................................................................1-1

1.2 POS Port Configuration.....................................................................................................1-1

1.2.1 Entering POS Port View..........................................................................................1-2

1.2.2 Adding/Deleting POS Ports into/from VLAN...........................................................1-2

1.2.3 Enabling/Disabling POS Ports ................................................................................1-2

1.2.4 Configuring POS Port Description...........................................................................1-3

1.2.5 Setting the Frame Format on a POS Port...............................................................1-3

1.2.6 Enabling the Scrambling Function on a POS Port..................................................1-3

1.2.7 Setting Alarm Thresholds for a POS Port...............................................................1-4

1.2.8 Setting the Clock Mode on a POS Port...................................................................1-4

1.2.9 Setting the State Polling Timer on a POS Port.......................................................1-5

1.2.10 Setting the CRC Check Bit Length on a POS Port ...............................................1-5

1.2.11 Setting the Loopback Mode of a POS Port...........................................................1-5

1.2.12 Setting the Overhead Byte Type of a POS Port....................................................1-6

1.2.13 Setting the Timeout Time for PPP Negotiation.....................................................1-7

1.2.14 Setting the MTU of a POS Port.............................................................................1-7

1.2.15 Setting the Interval for Collecting Statistic Data on a POS Port ...........................1-7

1.3 Displaying and Maintaining POS Port Configuration.........................................................1-8

1.4 POS Port Configuration Example......................................................................................1-8

1.5 Troubleshooting POS Port Configuration..........................................................................1-9

Operation Manual – POS Port

H3C S9500 Series Routing Switches Chapter 1 POS Port Configuration

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Chapter 1 POS Port Configuration

When configuring a POS port, go to thesesections for information you are interested in:

zPOS Port Overview

zPOS Port Configuration

zDisplaying and Maintaining POS Port Configuration

zPOS Port Configuration Example

zTroubleshooting POS Port Configuration

1.1 POS Port Overview

Synchronous optical network (SONET), a synchronous transmission system defined by

ANSI, is an international standard transmission protocol. It adopts optical transmission

where transmission rates form a sequence of STM-1 (155 Mbps), STM-4c (622 Mbps),

STM-16c/STM-16 (2.5 Gbps), and STM-64 (10 Gbps), each four times the immediate

lower level. Because signals are synchronous, SDH can multiplex multiple signals

conveniently.

Synchronous digital hierarchy (SDH), defined by CCITT (ITU-T at present), uses a

SONET rate subset.

Packet over SONET/SDH (POS) is a technology used in MAN (metropolitan area

network) and WAN (wide area network) for data packet transmission.

S9500 series use SDH and SONETas its physical layer protocol, maps data packets of

varying lengths into SDH/SONETsynchronous load, and provides a type of high-speed

and reliable point-to-point data connections.

The POS ports on S9500 series work at the rates of STM-1/OC-3 (155.52 Mbps),

STM-16 (2.5 Gbps) and STM-64 (10 Gbps). POS ports use the Point-to-Point Protocol

(PPP) at the data link layer and the Internet Protocol (IP) at the network layer.

1.2 POS Port Configuration

The following sections describe POS port configuration tasks:

zEntering POS Port View

zAdding/Deleting POS Ports into/from VLAN

zEnabling/Disabling POS Ports

zConfiguring POS Port Description

zSetting the Frame Format on a POS Port

zEnabling the Scrambling Function on a POS Port

zSetting Alarm Thresholds for a POS Port

zSetting the Clock Mode on a POS Port

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zSetting the State Polling Timer on a POS Port

zSetting the CRC Check Bit Length on a POS Port

zSetting the Loopback Mode of a POS Port

zSetting the Overhead Byte Type of a POS Port

zSetting the Timeout Time for PPP Negotiation

zSetting the MTU of a POS Port

zSetting the Interval for Collecting Statistic Data on a POS Port

1.2.1 Entering POS Port View

Before configuring the POS port, enter POS port view first.

Perform the following configuration in system view.

To do … Use the command …

Enter POS port view interface pos interface-number

1.2.2 Adding/Deleting POS Ports into/from VLAN

You can add a POS port into a designated VLAN, so that it can forward the packets of

that VLAN.

Perform the following configuration in POS port view.

To do … Use the command …

Add a POS port into the VLAN pos access vlan vlan-id

Delete a POS port from the VLAN undo pos access vlan

Note:

zA POS port cannot be added to VLAN 1.

zThe VLAN that a POS port is added to must already exist and be configured with a

VLAN interface that is assigned an IP address.

zYou cannot add a POS port to a VLAN that already contains ports, and vice versa.

1.2.3 Enabling/Disabling POS Ports

After completing the configuration of a POS port, you can use undo shutdown

command to enable the POS port. Youalso can use undo shutdown to disable it if you

want to stop data forwarding on it.

Perform the following configuration in POS port view.

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To do … Use the command …

Enable POS port shutdown

Disable POS port undo shutdown

By default, POS ports are enabled.

1.2.4 Configuring POS Port Description

Perform the following configuration in POS port view.

To do … Use the command …

Configure a POS port description description text

Delete the POS port description undo description

By default, a POS port has no description.

1.2.5 Setting the Frame Format on a POS Port

The POS port supports two frame formats: SDH and SONET.

Perform the following configuration in POS port view.

To do … Use the command …

Set the frame format on the POS port to

SDH/SONET frame-format { sdh | sonet }

Restore the default frame format undo frame-format

By default, the frame of a POS port is SDH.

1.2.6 Enabling the Scrambling Function on a POS Port

You may configure payload scrambling on a POS port to prevent the presence of

excessive consecutive 1s or 0s to facilitate line clock signal extraction at the receiving

end.

Perform the following configuration in POS port view.

To do … Use the command …

Enable the scrambling function on the POS port scramble

Disable the scrambling function on the POS port undo scramble

By default, the scrambling function is enabled on a POS port.

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1.2.7 Setting Alarm Thresholds for a POS Port

You can use the threshold command to set the SD (signal degrade) threshold or SF

(signal fail) threshold for a POS port.

SD and SF alarms are used to indicate the current line performance. Both may occur

when the receiver detects B2 error. The bit error rate threshold of SF is higher than that

of SD, meaning when a few errors occur, SD alarms are generated; while when error

rate is increased to a certain degree, SF alarms are generated, indicating the line

performance is degrading seriously.

Perform the following configuration in POS port view.

To do … Use the command …

Set the SD and SF thresholds of the POS port threshold { sd | sf } value

Restore the defaults undo threshold { sd | sf }

If you execute the threshold command with the value argument set to X, the value of

the threshold specified can be obtained using this expression: 10e-X.

By default, the SD threshold is10e-6 (meaning Xtakes a value of 6), and the SF

threshold is 10e-3 (meaning Xtakes a value of 3).

Note that the SD threshold must be smaller than the SF threshold.

1.2.8 Setting the Clock Mode on a POS Port

POS ports support two clock modes:

zMaster clock mode, using internal clock signals

zSlave clock mode, using line clock signals

When two switches are connected through POS ports, you should set one POS port in

master clock mode and the other in slave clock mode. Otherwise, the clocks of the two

switches may be asynchronous, and packet loss may occur.

Perform the following configuration in POS port view.

To do … Use the command …

Set the clock mode on the POS port to master clock master

Set the clock mode on the POS port to slave clock slave

Restore the default undo clock

By default, a POS port is in slave clock mode.

Operation Manual – POS Port

H3C S9500 Series Routing Switches Chapter 1 POS Port Configuration

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1.2.9 Setting the State Polling Timer on a POS Port

You may configure the state polling timer on a POS port to have the protocol running on

it (PPP for example) regularly send ECHO Requests. If the port receives no response

from the peer within the specified time limit, it regards that the peer has failed.

Perform the following configuration in POS port view.

To do … Use the command …

Set the state polling timer on the POS port timer hold seconds

Restore the default undo timer hold

By default, the polling interval is 10 seconds. If you set the polling interval as 0, the

system does not perform link validity check.

1.2.10 Setting the CRC Check Bit Length on a POS Port

The POS port supports 16-bit and 32-bit CRC check.

Perform the following configuration in POS port view.

To do … Use the command …

Set the CRC check bit length on the POS port to 16 bits crc 16

Set the CRC check bit length on the POS port to 32 bits crc 32

Restore the default undo crc

By default, the CRC check bit length is 32 bits.

Caution:

10G POS ports do not support 16-bit CRC check.

1.2.11 Setting the Loopback Mode of a POS Port

Loopback is set for testing some special functions. Do not use it when the system works

normally.

Operation Manual – POS Port

H3C S9500 Series Routing Switches Chapter 1 POS Port Configuration

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Perform the following configuration in POS port view.

To do … Use the command …

Set the loopback mode of the POS port to internal loopback internal

Set the loopback mode of the POS port to external loopback external

Disable loopback on the POS port undo loopback

By default, loopback is disabled on a POS port.

Caution:

zYou cannot enable both internal loopback and external loopback on a POS port.

zWhen switching between internal loopback and external loopback, you must delete

the previous loopback setting before setting new loopback.

1.2.12 Setting the Overhead Byte Type of a POS Port

SDH provides many overhead byte types for monitoring at different levels.

Signal label byte C2 belongs to the high-order path overhead byte, and is used to

indicate the multiplexing structure and message payload of the VC (virtual container)

frame.

Regenerator section trace byte J0 belongs to the section overhead byte, and is used to

check port connectivity at section level.

Path trace byte J1 also belongs to the high-order overhead byte, and is used to check

port connectivity at path level.

Perform the following configuration in POS port view.

To do … Use the command …

Set the overhead byte type for

the POS port flag c2 flag-value

flag { j0 | j1 } { sdh | sonet } flag-value

Restore the default overhead

byte type undo flag c2

undo flag { j0 | j1 } { sdh | sonet }

Note:

You are recommended to configure a 15-character string for both j0 and j1.

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By default, c2 is 0x16 (hexadecimal); J0 and J1 are default.

C2, J0 and J1 configuration should be consistent at both ends. Otherwise, the system

may give alarms. The frame format of overhead bytes J0 and J1 must be consistent at

both POS ports. Otherwise, the system cannot read the peer field values correctly.

1.2.13 Setting the Timeout Time for PPP Negotiation

During negotiation, PPP shall retransmit a message if it receives no response from the

peer within the defined time limit. You can customize the timeout time for PPP

negotiation.

Perform the following configuration in POS port view.

To do … Use the command …

Set timeout time for PPP negotiation ppp timer negotiate seconds

Restore the default value undo ppp timer negotiate

By default, the timeout time for PPP negotiation is 3 seconds.

1.2.14 Setting the MTU of a POS Port

Perform the following configuration in POS port view.

To do … Use the command …

Set the MTU of the POS port mtu mtu-value

By default, the MTU is 1,500 bytes.

Note that you must disable the port by using the shutdown command first and then use

the undo shutdown command to enable it again if the MTU values are different

between the two ends. In this case, as the result of the negotiation between the two

ports, the smaller value will be used as the MTU.

1.2.15 Setting the Interval for Collecting Statistic Data on a POS Port

Perform the following configuration in POS port view.

Follow these steps to configure the interval for collecting statistic data on a POS port.

To do … Use the command … Remarks

Set the interval for

collecting statistic data on

the port flow-interval interval Required

300 seconds by default

The switch collects statistics data on the port to get the average rate in the interval.

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H3C S9500 Series Routing Switches Chapter 1 POS Port Configuration

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1.3 Displaying and Maintaining POS Port Configuration

Operation Command Remarks

Display all information

about POS port(s) display interface pos

[ interface-number ] Available in any

view

Clear the statistics of

POS port(s) reset counters interface pos

[ interface-number ] Available in user

view

Enable/disable POS

port debugging

[ undo ] debugging ppp { { ipcp |

lcp } { all | error | event | packet |

state } | all | core event | ip packet |

mpls-multicast packet |

mpls-unicast packet |osi-npdu }

[ interface { aux | pos }

interface-number ]

Available in user

view

1.4 POS Port Configuration Example

I. Network requirements

Configure Switch A and Switch B to make them communicate with each other through

POS ports. Switch B provides the clock.

II. Network prerequisites

None

III. Network diagram

As shown in Figure 1-1, Switch A and Switch B are interconnected by POS 2/1/1 and

POS 3/1/1, whose addresses are 202.38.163.10/24 and 202.38.163.11/24.

Figure 1-1 Network diagram for directly-connected POS port configuration

IV. Configuration procedure

1) Configure Switch A

# Create a VLAN interface with an IP address for the VLAN to which the POS port is to

be assigned.

<Switch A> system-view

[Switch A] vlan 2

[Switch A-vlan2] interface vlan-interface 2

[Switch A-Vlan-interface2] ip address 202.38.163.10 255.255.255.0

[Switch A-Vlan-interface2] quit

Operation Manual – POS Port

H3C S9500 Series Routing Switches Chapter 1 POS Port Configuration

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# Add the POS port to the VLAN.

[Switch A] interface pos 2/1/1

[Switch A-Pos2/1/1] pos access vlan 2

2) Configure Switch B

# Create a VLAN interface with an IP address for the VLAN to which the POS port is to

be assigned.

<Switch B> system-view

[Switch B] vlan 2

[Switch B-vlan2] interface vlan-interface 2

[Switch B-Vlan-interface2] ip address 202.38.163.11 255.255.255.0

[Switch B-Vlan-interface2] quit

# Add the POS port to the VLAN.

[Switch B] interface pos 3/1/1

[Switch B-Pos3/1/1] pos access vlan 2

# Configure the clock source.

[Switch B-Pos3/1/1] clock master

1.5 Troubleshooting POS Port Configuration

Symptom 1:

The POS port is down at the physical layer.

Solution:

Check that

zThe receiver (Rx) and transmit (Tx) optical fibers are connected correctly to the

POS ports. If the Tx and Rx ends of a optical fiber both are connected to the same

POS port, then you can see the information “loopback detected” when performing

the display interface pos command even if loopback function is not enabled yet.

zThe right optical module (providing the POS ports) is inserted.

Symptom 2:

The POS port has been enabled at the physical layer, but the link does not report the

Up state.

Solution:

Check that

zInconsistent physical parameters, such as POS port clock, scrambling setting, are

set at the two ends.

zInconsistent link data layer protocols are set at the two ends.

zThe port CRC settings are consistent at the two ends.

zLoopback is not set on the port.

zThe VLAN to which the port belongs has been administratively shut down.

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