Installing and Configuring the MGX-1OC12POS-IR Back Card
This chapter describes how to install and configure the single-port OC-12 Packet Over SONET (POS) back card on a Cisco RPM-XF. This chapter includes the following sections:
•
Overview and Features
•
Installation Guidelines
•
Software Configuration
•
Troubleshooting the Installation
Overview and Features
The MGX-1OC12POS-IR back card (Figure 5-1) is fully compatible with standards-based POS implementations on platforms such as the Cisco 7200, the Cisco 7500, the Cisco 10000 edge services router (ESR), and the Cisco 12000 series gigabit switch router (GSR).
Figure 5-1 MGX-1OC12POS-IR Back Card
The MGX-1OC12POS-IR back card (see Figure 5-1) provides a trunk uplink that supports OC-12c/STM-4c bandwidth of 622 Mbps throughput over a standard SONET/SDH interface using a single-mode fiber, intermediate-reach SC connector (see Table 5-1).
Table 5-1 MGX-1OC12POS-IR Cable Specifications
|
|
|
|
Single-mode fiber |
1300 |
8 to 10 |
49,213 ft (15 km) |
The MGX-1OC12POS-IR back card provides the following key features:
•
Efficient, high-performance bandwidth utilization—OC-12 performance of 622 Mbps provides the bandwidth required to meet the most demanding user requirements, such as faster access to web pages, real-time video, large file transfers, and other data-intensive applications.
The Cisco POS implementation offers a 25 to 30 percent gain in efficiency over multiservice IP traffic now running over ATM networks. It achieves this efficiency gain by eliminating the overhead required in ATM implementations, such as ATM cell header, IP over ATM encapsulation, and segmentation and reassembly (SAR).
•
Optimized for IP-based differentiated services—The Cisco POS solution supports Internet-based multiservice networks based on IP. The Cisco POS implementation places the IP layer directly above the SONET layer and eliminates the overhead required to run IP over ATM over SONET.
•
Configurable clock sources—The MGX-1OC12POS-IR back card is capable of providing the clock source for the POS link and also retrieving the clock source from network.
•
Configurable loopbacks for troubleshooting—The MGX-1OC12POS-IR back card is capable of configuring both an internal loopback (loops outbound traffic back towards the front card) and a network loopback (loops inbound traffic back towards the network).
•
Alarm processing—The MGX-1OC12POS-IR back card implements SONET alarms that are fully Bellcore GR-253 compliant.
Installation Guidelines
This section contains guidelines for the following procedures:
•
New installation
•
Replacement installation
The Cisco MGX-1OC12POS-IR back cards are cold swappable, which means that you can remove and replace the back cards when all interfaces on the back cards are in the shutdown state.
Caution
To prevent electrostatic discharge (ESD) damage, handle back cards by the faceplate or the card carrier edges only. Avoid touching the back card printed circuit board, components, or any connector pins.
New Installation Guidelines
For information on installing the back card hardware, see "Installing the MGX RPM-XF Front and Back Cards."
After installing the MGX-1OC12POS-IR back card hardware for the first time, you must configure it by entering the configure command. For information about configuring the MGX-1OC12POS-IR back card, see the "Software Configuration" section below.
Replacement Installation Guidelines
For information on removing and installing the back card hardware, see "Installing the MGX RPM-XF Front and Back Cards."
If an MGX-1OC12POS-IR back card is replaced, the system automatically downloads the necessary information from the RPM-XF front card. There is no need to configure the new back card, unless the front card has been reloaded or switched over subsequent to the removal of the back card of the same type. After the information is downloaded, the system recognizes only those interfaces that match the previous MGX-1OC12POS-IRS back card configuration (those configured as Up).
Software Configuration
After the MGX-1OC12POS-IR back card is successfully installed, you can configure the card for network use.
Note
You do not need to configure the MGX-1OC12POS-IR back card if this is a replacement installation. The system automatically downloads the necessary configuration information from the RPM-XF front card.
This section covers the following topics:
•
MGX-1OC12POS-IR Back Card Default Values
•
MGX-1OC12POS-IR Back Card Syntax
•
Configuring the Interface
•
Other Configuration Commands
•
Example Configuration
•
Using show Commands to Check System Status
MGX-1OC12POS-IR Back Card Default Values
Table 5-2 lists default values for the MGX-1OC12POS-IR back card. The commands marked with an asterisk (*) are described in the Cisco IOS command reference documentation. The other commands are among those described in this chapter.
The table includes the command used for modifying a default value and indicates whether a value needs to be the same (or opposite) on the remote end of the connection.
Table 5-2 MGX-1OC12POS-IR Back Card Defaults
|
|
|
|
bandwidth* |
622000 |
|
Same. |
clock source |
line |
clock source [line | internal]
|
At least one side must be set to internal. |
crc* |
32 |
|
Same. |
encapsulation* |
HDLC |
encapsulation [hdlc | ppp]
|
Same. |
keepalive* |
10 second keepalive |
|
Same. |
mtu*1 |
4470 |
|
Same. |
pos framing |
SONET |
pos framing [sonet | sdh]
|
Same. |
pos scramble-atm |
No scrambling |
|
Same. |
pos flag2 ( |
c2—0xcf j0—0x01 s1s0—0x00 |
pos flag [c2 | j0 | s1s0] value
|
Same. |
MGX-1OC12POS-IR Back Card Syntax
To specify an interface number in a configuration command, use the syntax in Table 5-3 to identify interfaces on the MGX-1OC12POS-IR back card.
Table 5-3 MGX-1OC12POS-IR Interface Syntax
|
|
|
POS interface |
1/ |
0 |
The following example shows the syntax for configuring an MGX-1OC12POS-IR back card.
Router(config)#
interface pos 1/0
Configuring the Interface
After you verify that the MGX-1OC12POS-IR back card is installed correctly, use the following procedure to configure the new interface. Be prepared with the information you will need, such as the interface IP address.
The following procedure is for creating a basic configuration—Enabling an interface.
Step 1
At the global configuration prompt, specify the new interface to configure by entering the interface pos <bay/port> command and interface address. For example,
Router(config)# interface pos 1/0
Step 2
Assign an IP address and a subnet mask to the interface with the ip address configuration subcommand, as in the following example.
Router(config-if)# ip address 192.168.255.255 255.255.255.0
Step 3
Specify either HDLC or PPP encapsulation. For example,
Router(config-if)# encapsulation hdlc
Step 4
If necessary, modify the MGX-1OC12POS-IR back card configuration or that of the remote device to ensure that, where appropriate, they use the same settings. For more information, see the "Remote Side Setting" column in Table 5-2.
Step 5
Add any other configuration subcommands required for the enabling of routing protocols and adjust the interface characteristics.
Step 6
Enter the no shutdown command to enable the interface.
Router(config-if)# no shutdown
Step 7
When you have included all of the configuration subcommands to complete the configuration, press Cntl-Z to exit configuration mode.
Step 8
Write the new configuration to memory.
Router# copy running-config startup-config
The system displays an OK message when the configuration is stored.
After you complete your configuration, check it by entering the show interface pos <bay/port> command.
Other Configuration Commands
The following sections present some of the commands that you can use to customize your MGX-1OC12POS-IR back card configuration.
This section covers the following topics:
•
Setting the Clock Source
•
Configuring Framing
•
Specifying SONET Overhead
•
Configuring POS SPE Scrambling
•
Configuring Loopback Testing
Setting the Clock Source
At the prompt, set the internal or line clock source by entering the clock source command.
clock source [internal | line]
|
|
internal |
Specifies that the internal clock source is used. |
line |
Specifies that the network clock source is used. |
The default is clock source line.
In this example, the back card is instructed to use a line clock source.
Router(config)# interface pos 1/0
Router(config-if)# clock source line
Configuring Framing
You can use the pos framing command to set framing to SONET STS-3c or SDH STM-1 framing.
pos framing [sdh | sonet]
The default is SONET.
Make sure your system supports SDH before using this option.
Use the no form of the command to restore the default framing mode.
In the following example, the framing type is set to SONET.
Router(config)# interface pos 1/0
Router(config-if)# no pos framing
Specifying SONET Overhead
You can use the pos flag command to assign values for specific elements of the frame header. This command is typically used to meet a standards requirement or to ensure interoperability with another vendor's equipment.
pos flag [ c2 | j0 | s1s0 value]
[
no] pos flag [ c2 | j0 | s1s0 value]
|
|
c2 |
Specifies a path signal identifier, and value is one of the following: • 0xCF for PPP or HDLC without scrambling • 0x16 for PPP or HDLC with scrambling |
j0 |
Specifies the section trace byte, and value is 0x1 for interoperability with some SDH devices in Japan. |
s1s0 |
Designates part of the payload pointer byte, and value is one of the following: • 0 for OC-3c • 2 for AU-4 |
The default values are c2-0xCF, j0-0x01, and s1s0-0.
Use the no form of the command to restore the default values.
In the following example, the c2 bit is set to 0xCF.
Router(config)# interface pos 1/0
Router(config-if)# pos flag c2 0xCF
Configuring POS SPE Scrambling
The pos scramble-atm command allows you to scramble the POS synchronous payload envelope (SPE). SONET payload scrambling applies a self-synchronous scrambler to the SPE of the interface to ensure sufficient bit transition density.
The default is no POS SPE scrambling.
Use the no form of the command to disable scrambling.
In the following example, scrambling is enabled:
Router(config)# interface pos 1/0
Router(config-if)# pos scramble-atm
Configuring Loopback Testing
To enable loopback testing of data transmitted from the front card to the MGX-1OC12POS-IR back card and back, use the loopback command in interface configuration mode.
loopback [line | internal]
[
no] loopback [line | internal]
|
|
line |
Loops any inbound traffic received at the MGX-1OC12POS-IR back card's network interface back into the network. Note Even though the inbound traffic is looped back towards the network, the inbound traffic continues to flow into the front card. Outbound traffic (from the front card) is silently dropped by the back card's network interface. |
internal |
Loops any outbound traffic received at the MGX-1OC12POS-IR back card's network interface back into the front card. Note Even though the outbound traffic is looped back towards the front card, the outbound traffic continues to flow towards the network. Inbound traffic (from the network) is silently dropped by the back card's network interface. |
Use the no form of the command to stop the loopback test.
In the following example, a loopback is set for the MGX-1OC12POS-IR back card:
Router(config)# interface pos 1/0
Router(config-if)# loopback line
Example Configuration
The following is an example of configuration file commands for a Cisco RPM-XF with an MGX-1OC12POS-IR back card (Router 1) connected back-to-back with a Cisco 12000 series router with an OC-12c/STM-4c Layer 3 POS back card in slot 3 (Router 2).
ip address 10.1.2.4 255.0.0.0
ip address 10.1.2.3 255.0.0.0
Using show Commands to Check System Status
Each back card maintains information about its configuration, traffic, errors and so on. You can access this information by entering the show commands. Following are descriptions and examples of show commands that display back card information and status.
Enter the show interface pos <bay/port> command to show general information about the interface, as shown in the following example.
Router# show interface pos 1/0
POS1/0 is up, line protocol is up
Hardware is Skystone 4302 Sonet Framer
Internet address is 1.1.100.2/24
MTU 4470 bytes, BW 622000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 32, loopback not set
Last input 00:00:02, output 00:00:07, output hang never
Last clearing of "show interface" counters 00:00:16
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Output queue :0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Use the show controller pos <bay/port > command to show controller-specific information about the interface, as shown in the following example. For the MGX-1OC12POS-IR back card, this includes information such as, which SONET alarms are currently active, the SONET information received from the remote end, and the SONET configuration parameters.
Router# show controller pos 1/0
LOF = 0 LOS = 0 BIP(B1) = 0
AIS = 0 RDI = 0 FEBE = 0 BIP(B2) = 0
AIS = 0 RDI = 0 FEBE = 0 BIP(B3) = 0
LOP = 0 NEWPTR = 0 PSE = 0 NSE = 0
Alarm reporting enabled for: SF SD SLOS SLOF B1-TCA LAIS LRDI B2-TCA PAIS PLOP PRDI PUNEQ
B3-TCA
State: RDOOL_state = False
PATH TRACE BUFFER: STABLE
Remote Rx(K1/K2): B1/32 Tx(K1/K2): 08/00
BER thresholds: SF = 10e-3 SD = 10e-6
TCA thresholds: B1 = 10e-6 B2 = 10e-6 B3 = 10e-6
Troubleshooting the Installation
Refer to Table 5-4 for descriptions of the LEDs on the MGX-1OC12POS-IR back card. Follow the instructions in Table 5-5 to troubleshoot the installation.
Table 5-4 MGX-1OC12POS-IR Back Card LED Status and Definitions
|
|
|
LINK |
Green |
Carrier detected. |
Off |
Carrier not detected. |
TX (transmit) |
Green |
Transmitting traffic. |
Off |
Not transmitting traffic. |
RX (receive) |
Green |
Receiving traffic. |
Off |
Not receiving traffic. |
FAIL |
Yellow |
Major failure has disabled the back card. |
Off |
Back card is operating properly |
Table 5-5 MGX-1OC12POS-IR Installation Troubleshooting
|
|
|
The back card fail LED does not light during the power-on self-test. |
The back card is not properly seated. |
Be sure the ejector levers are fully closed and that the captive screws have been tightened. |
Bad back card slot or midplane connector. |
Remove the back cards (upper and lower slots) and the front card and install them into another chassis slot. |
Back card initialization fails. |
Bad back card slot or midplane connector. |
Remove the back cards (upper and lower slots) and the front card and install them into another chassis slot. |
Bad back card. |
Replace the back card. |
Bad front card. |
Replace the front card. |
The interface does not come up or constantly comes up and then goes down. |
Configuration mismatched. |
Check the configuration on both sides. (Refer to the "Software Configuration" section for more information.) |
Cables connected incorrectly. |
Check the cabling on both sides. Ensure the receive is connected to the transmit on the remote end and vice versa. |
Bad cables. |
Replace the cables. Ensure your cabling meets the specifications in Table 5-1. |