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This chapter contains information you need before beginning to configure the system. This chapter includes the following sections:
Before configuring the system, ensure that the following tasks have been completed:
For detailed information about these tasks, refer to the Cisco Metro 1500 Series Hardware Installation Guide.
You should also be familiar with the Linux commands that will be used to configure the system.
You will use the following Linux commands to configure the system:
For descriptions of these commands, see "Command Reference."
Internet Protocol (IP) addresses are composed of 4 bytes. The convention is to write addresses in what is called dotted decimal notation. In this form, each byte is converted to a decimal number (0-255), dropping any leading zeros (unless the number is zero) and written with each byte separated by a "." character. By convention, each interface of a host or router has an IP address. It is legal for the same IP address to be used on each interface of a single machine, but usually each interface has its own address.
IP networks are contiguous sequences of IP addresses. All addresses within a network have a number of digits within the address in common. The portion of the address that is common across addresses in the network is called the network portion of the address. The remaining digits are called the host portion. The number of bits that are shared by all addresses within a network is called the netmask and it is the role of the netmask to determine which addresses belong to the network and which do not. See Table 2-1 for address type examples.
| IP Address Type | Example |
|---|---|
Host address | 192.168.110.23 |
Network mask | 255.255.255.0 |
Network portion | 192.168.110. |
Host portion | .23 |
Network address | 192.168.110.0 |
Broadcast address | 192.168.110.255 |
Any address that is "bit-wise ANDed" with its netmask reveals the address of the network it belongs to. The network address is always the lowest numbered address within the range of addresses on the network and always has the host portion of the address coded all zeroes.
The broadcast address is a special address that every host on the network listens to in addition to its own unique address. This address is the one that datagrams are sent to if every host on the network is meant to receive them. Certain types of data (like routing information and warning messages) are transmitted to the broadcast address so that every host on the network can receive the data simultaneously. There are two commonly used standards for what the broadcast address should be. The most widely accepted one is to use the highest possible address on the network as the broadcast address. In this example, this would be 192.168.110.255. For some reason, other sites have adopted the convention of using the network address as the broadcast address. In practice it does not matter very much which you use, but you must make sure that every host on the network is configured with the same broadcast address.
For administrative reasons, early in the development of the IP protocol, some groups of addresses were formed into networks and these networks were grouped into what are called classes. These classes provide a number of standard size networks that can be allocated. Table 2-2 shows the allocated ranges.
| Network Class | Netmask | Network Addresses |
A | 255.0.0.0 | 0.0.0.0 - 127.255.255.255 |
B | 255.255.0.0 | 128.0.0.0 - 191.255.255.255 |
C | 255.255.255.0 | 192.0.0.0 - 223.255.255.255 |
Multicast | 240.0.0.0 | 224.0.0.0 - 239.255.255.255 |
The addresses you use depend on exactly what it is that you are doing. You may have to use a combination of the following activities to get all the addresses you need.
You can use either a serial or Ethernet port to log into the NEMI and configure the system. Before beginning to configure the system, you need to choose a connection method. For detailed information about setting up serial and Ethernet connections, refer to the Cisco Metro 1500 Series Hardware Installation Guide.
If you plan to connect the NEMI to an external network using a terminal server, modem, or other serial interface method, then the INNC connection should be made using the Ethernet port with an Ethernet X-cable. In this case, the RS-232 port and associated LapLink cable are used later to execute the NEMI software configuration procedures.
If you plan to connect the NEMI to an external network using the Ethernet port, then the INNC connection should be made using the RS-232 port and associated LapLink cable. In this case, the Ethernet port and an Ethernet X-cable are used later to execute the NEMI software configuration procedures.
For dial in and dial out, you must set up an external modem using the following AT commands on the modem:
If these settings are not set correctly, the NEMI will not connect properly.
The following settings affect modem behavior when calls start and end:
If your modem does not support a stored profile, you can set these options using the INIT string in your config file. Some modems have dip switches that affect register settings. Be sure that these are set correctly, too.
The modem should be connected by a cable that transmits all of the following signals (see Table 2-3) to the NEMI DB9 serial connector.
| DB9 | Connector | Pins |
|---|---|---|
RxD | Receive data | 2 |
TxD | Transmit data | 3 |
DT | Data terminal ready | 4 |
GND | Signal ground | 5 |
DSR | Data set ready | 6 |
RTS | Request To Send | 7 |
CTS | Clear To Send | 8 |
RI | Ring indicator | 9 |
Posted: Sat Sep 28 02:42:38 PDT 2002
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