Router interface configuration and management--6

Wan Interface Configuration

Seven, POS interface configuration and Management

The POS (Packet over SONET/SDH) interface can take advantage of SONET (synchronous Optical Network, synchronous fiber network) or SDH (synchronous Digital Hierarchy, Synchronous digital System) provides the high-speed transmission channel directly transmits the IP data service, is widely used in the metropolitan area network and the WAN.

In the AR G3 router family, the POS interface is provided by the 1STM1 or 1STM4 interface card.

1, POS Interface Introduction

The optical module used by the POS interface:

The POS uses the Link layer protocol (FR, PPP, HDLC, etc.) to encapsulate the IP packets, and then the SONET/SDH channel layer's business adapter maps the encapsulated IP packets to the SONET/SDH synchronous payload, then loads the net load into a SONET/SDH frame, The last delivery is transmitted in the optical network.

The POS interface uses the SONET/SDH physical layer transport standard to provide a high-speed, reliable, point-to-point IP data connection. The AR G3 series routers offer two-rate POS interfaces, and the signal classes used for both rates are oc-3/stm-1 (155mbit/s) and oc-12/stm-4 (622MBIT/S).

SONET/SDH is a two-way synchronous transmission system, SDH is mainly used in Europe and China, sonet mainly in North America and Japan.

SONET defines the line rate hierarchy of synchronous transmissions for fiber-optic transmission systems whose transmission rates are based on 51.84mbit/s, in which the rate is called the 1th stage synchronous transmission signal (synchronous Transport Signal), or STS-1, The STS-1 data frame is the basic unit that is transmitted in SONET. In the optical signal, this rate is called the 1th Stage optical carrier (Optical Carrier), or OC-1. 3 OC-1 (STS-1) signals are multiplexed into the next level OC-3 of the SONET hierarchy at a rate of 155.520mbit/s. Higher-rate circuits are composed of multiple low-rate circuits that are continuously aggregated, and the rate can be seen from the name, such as 4 OC-3 multiplexed into a 622.08mbit/s circuit called OC-12.

SDH is a new optical fiber technology based on SONET, which is standardized by ITU-T, and the basic rate of SDH is 155.52mbit/s, called the 1th level synchronous transmission Module (Synchronous Transport module), namely STM-1, Equivalent to the OC-3 rate. The higher rate of SDH access rate is formed by Time Division Multiplexing (STM-N), which is the rate of STM-1 N times (n=4n=1,4,16,64,256).

Both SONET and SDH systems can be used to encapsulate older digital transmission standards, such as the PDH quasi-synchronous digital system, or directly to support ATM and packet business (Packet over SONET) networks on the so-called SONET.

2. Configuring the POS interface

The configuration of POS interface mainly includes: Link layer protocol of interface, interface clock mode, overhead byte, MTU, frame format, scrambling function, CRC check function and log threshold, etc.

The configuration here is similar to the Ce1/pri interface

3. POS Interface Management

1) Display interface pos "Interface-number": View pos interface Configuration and Status

2) Display Interface Brief: View brief information on POS interface

3) Reset counters Interface "Interface-type" Interface-number "": Clears the statistics on the interface.

4, the POS interface physical Parameters configuration example :

Two devices connected through the SONET network, AR20 complete the following parameter settings, in order to ensure successful docking, need to complete the R19 POS interface configuration:

1) the R20 POS interface frame format is SONET.

2) R20 POS Interface Link layer protocol for HDLC

3) R20 POS interface clock mode for slave clock mode

4) The POS interface MTU value of R20 is 1200 bytes

5) R20 POS interface does not disturb the load data

6) R20 POS interface CRC Check Word length is 16 bits

7) The POS interface overhead byte C2 for R20 is 3,j0 and J1 are evaluated in 16-byte mode, where J0 is abc,j1 to XYZ.

Both devices are registered with the 1POS Wsic interface card, and the cloud is set up with two POS interfaces.

Configuration process:

On ENSP, when the frame format is configured, it cannot be set to SONET, the default is SDH, the overhead byte cannot be configured, the scrambling function cannot be turned off, and the two ends are configured to ping through.

Eight, CPOs interface configuration and management

CPOs is a channel-based POS interface, mainly used to improve the equipment to low-speed access to the convergence capacity, when the need to converge through the router SONET/SDH transmission network E1/T1 line can be used CPOs, can be aggregated into each branch of the E1/T1 line.

1, configuration through the CPOs interface to achieve device connectivity

When the data is transmitted over long distances through the CPOs interface between the corporate headquarters and the regional distribution, the CPOs interface can be configured to be connected either directly via optical fiber or through WDM (wavelength division multiplexing, Wavelength Division multiplexing) technology.

The configuration of the CPOs interface is directly connected by optical fiber or WDM technology mainly includes the following two configurations:

1) Configure the docking mode between the CPOs interfaces

When the CPOs interface between this device and the peer-to-peer device is connected by direct fiber or WDM technology, the docking mode of the POS interface needs to be configured for non-Huawei devices. However, there is no need to configure the docking mode of the CPOs interface when the e1/t1 links of each branch node converge through the Sdh/sonet network to the CPOs interface of the router.

2) Configure the line properties of the CPOs interface

2, configuration CPOs interface aggregation Access E1 line

When multiple branches of the enterprise through E1, T1 line access to the SONET/SDH transmission network, in order to save costs and improve the convergence of equipment to low-speed access, the Enterprise Regional division can use CPOs interface aggregation access to these E1, T1 lines.

The enterprise branch uses the low-end router through the E1/T1 line to access the SONET/SDH transmission network, converges to one or several CPOs interfaces on the regional division router, routera through the time slot uniquely identifies each middle-low-end router. In fact, the CPOs interface and the low-end routers may pass through more than one SONET/SDH transmission network, the low-end routers and SONET/SDH transmission network may also need other means of transmission relay. The CPOs interface can be channel-formed into multiple e1/t1 channels to bring together e1/t1 lines from different enterprise branches. Each e1/t1 line can contain one channel or multiple channels. The CPOs interface forms a E1 channel with two modes of operation: non-channel mode and channel mode.

1) when the E1 channel works in non-channel mode, it is equivalent to a non-time slot, the data bandwidth is 2.048MBIT/S interface, its logic characteristics and synchronous serial port is the same.

2) When the E1 channel is working in the channel mode, the 2MBIT/S transmission line is divided into 32 64kbit/s time slots, corresponding to the number 0~31, where 0 is used for the transmission of synchronization information, except 0 of all the time slots are arbitrarily divided into a group (channel set), the group as an interface to use, The rate is nx64kbit/s. The logical feature is the same as the synchronous serial port.

Before configuring the CPOs interface to converge into the E1 line, make sure that the Multiplexing unit configuration of the SDH transmission device corresponds correctly to the E1 channel sequence number of the device CPOs.

3, configuration CPOs interface aggregation Access T1 line

The CPOs interface forms a T1 channel and there are two modes of operation: non-channel mode and channel mode.

1) When the T1 channel is working in non-channel mode, it is equivalent to a non-time slot, the data bandwidth is 1.544MBIT/S interface, the logic characteristic and synchronous serial port are the same.

2) when the T1 channel operation in the channel mode, its full time slot (1~24) can be arbitrarily divided into a group, the group as an interface used, the rate is nx56kbit/s or nx64kbit/s, the logical characteristics and synchronous serial port is the same.

The default T1 channel works in channel mode.

4. CPOs Interface Management

1) Display controller CPOs "Cpos-number": View the physical layer configuration information status of the CPOs interface configuration and all e1/t1 channels.

2) Display Controller CPOs cpos-number E1 e1-number: View the physical layer configuration information for the specified CPOs channel for the specified E1 interface.

3) display controller CPOs cpos-number T1 t1-number: View the physical layer configuration information for the specified CPOs channel for the specified T1 interface.

4) Reset counters Interface "Interface-type" Interface-number "": Clears the statistics of CPOs channels formed by CPOs interface or E1/T1 interface.

The loopback detection feature of the POS interface is configured by selecting the configuration according to the actual interface type in the POS interface view:

1) If CPOs interface is detected, execute loopback {local | remote} command

2) If the E1 channel under the CPOs interface is detected, execute E1 e1-number set Loopback {local | remote} command, e1-number Specify the E1 channel number that configures the loopback detection feature, range 1~63

3) If the T1 channel under the CPOs interface is detected, execute T1 t1-number set Loopback {local | remote} command, t1-number Specify the T1 channel number to configure the loopback detection function, range 1~84

5, the CPOs interface through the optical fiber direct connection Configuration Example :

The CPOs interface of the Routera and Routerb is directly connected via fiber optics.

1) SDH transmission system is used in Routera and Routerb area.

2) The AU-3 multiplexing path for the Routera and Routerb regions.

3) Routerb for Alcatel Equipment

4) The clock mode of the Routerb CPOs interface is from clock mode.

5) Routerb CPOs interface Overhead byte C2 is 3, S1 for 14,j0 and J1 are in 16-byte mode, where J0 is ABC, J1 is xyz.

[Huawei]sysname RouterA
[Routera]interface CPOs 1/0/0
[Routera-cpos1/0/0]multi-channel Align-mode Alcatel
[Routera-cpos1/0/0]frame-format SDH
[Routera-cpos1/0/0]multiplex mode au-3
[Routera-cpos1/0/0]flag C2 3
[Routera-cpos1/0/0]flag S1 14
[Routera-cpos1/0/0]flag j0 16byte-mode ABC
[Routera-cpos1/0/0]flag J1 16byte-mode XYZ
[Routera-cpos1/0/0]clock Master
[Routera-cpos1/0/0]quit

6, CPOs interface aggregation access E1 line Configuration example

Routera nodes have Routerb~h7 branch nodes, each branch node device through the E1 line upstream connection to Routera,routera through the CPOs interface aggregation upstream E1 line, routerb node using two E1 lines to bundle, Requires the use of the Mp-group interface method.

1) Routera Use the clock from the SDH network

2) The frame format of the Routera CPOs interface is Sdh,aug multiplexed path to Au-4

Create and configure the Mp-group on Routera
[Huawei]sysname RouterA
[Routera]interface Mp-group 0/0/1
[Routera-mp-group0/0/1]ip Address 100.10.10.1 24
[Routera-mp-group0/0/1]quit
Configure two E1 channels under the CPOs interface
[Routera]controller CPOs 1/0/0
[Routera-cpos1/0/0]e1 1 unframed
[Routera-cpos1/0/0]e1 1 Set Clock Master
[Routera-cpos1/0/0]e1 2 unframed
[Routera-cpos1/0/0]e1 2 Set Clock Master
[Routera-cpos1/0/0]quit
The CPOs interface is formed into two E1 channels for corresponding MP bindings
[Routera]interface serial 1/0/0/1:0
[ROUTERA-SERIAL1/0/0/1:0]PPP MP Mp-group 0/0/1
[Routera-serial1/0/0/1:0]quit
[Routera]interface serial 1/0/0/2:0
[ROUTERA-SERIAL1/0/0/2:0]PPP MP Mp-group 0/0/1
[Routera-serial1/0/0/2:0]quit

Create and configure the Mp-group on Routerb
[Huawei]sysname Routerb
[Routerb]interface Mp-group 0/0/1
[Routerb-mp-group0/0/1]ip Address 100.10.10.2 24
[Routerb-mp-group0/0/1]quit
The E1-f interface on the Routerb is MP-bound
[Routerb]interface serial 1/0/0
[Routerb-serial1/0/0]fe1 unframed
[ROUTERB-SERIAL1/0/0]PPP MP Mp-group 0/0/1
[Routerb-serial1/0/0]quit
[Routerb]interface serial 2/0/0
[Routerb-serial2/0/0]fe1 unframed
[ROUTERB-SERIAL2/0/0]PPP MP Mp-group 0/0/1
[Routerb-serial2/0/0]quit

Router interface configuration and management--6