How to Configure Cisco 2500 Series routers
Cisco Routers firms are highly reliable equipment and and very easy to configure, at the author's opinion, superior to its competitors, though, and their value by 20% more than counterparts from other manufacturers in the class switches and routers for medium-level managers.
The article will be considered on a logical division of the block of addresses allocated to the ISP subnet following the structure of the company's divisions, configuring Cisco 2500 series router for the organization of a small company to access to the Internet by connecting to a synchronous channel of approx. 256K from the ISP and IP packet filtering. Our router will have engaged one serial port to connect to the ISP (Serial 0) and one Ethernet port (P), looking into a network company, under which the ISP has allocated a network of 254 hosts.
1. Initial configuration of a router.
Cisco routers runs on a high-performance and it is created from scratch operating system clled IOS, which is located in non-volatile memory (flash). A typical 2500 series model has 1 Ethernet port, connected to the HUB-in or switch to the network through transceiver AUI-> UTP, and two serial ports for connecting to global channels (Serial 0, Serial 1). Interface names can be specified as Ethernet0 or e 0. A modular Catalyst switch indicates the type of interface at first, then the slot, and then port.
For example, the 3rd card and 2 ethernet port on the motherboard is referred to as "e 3 / 2. In addition, there is a console port to configure the router (including the serial port of your computer) and an additional AUX port for connecting a modem. Configuring a router can be done either through the console port, AUX port, and a session of telnet.
Newer versions of IOS allow you to work with the router via SSH session. But when you first time load anything, it requires to configure the router via the console port. To do this, you have to set the port speed Serial in 9600, starting in the terminal configuration program. By attaching a console cable (comes) to the router (port CON) and the other end through the adapter to the PC go to the console Cisco router. Then turn on the router and see that the first boot bootloader bootstrap:
System Bootstrap, Version 5.2 (8a), RELEASE SOFTWARE
Copyright (c) 1986-1995 by cisco Systems
2500 processor with 16384 Kbytes of main memory
F3: 3268680 +81304 +204996 at 0x3000060
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706
Then boot loader loads the operating system IOS from flash (flash):
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-IL), Version 11.0 (4), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1995 by cisco Systems, Inc.
Compiled Mon 18-Dec-95 17:49 by alanyu
Image text-base: 0x0301C8DC, data-base: 0x00001000
cisco in 2500 (68030) processor (revision D) with 16380K/2048K bytes of memory.
Processor board ID 02413443, with hardware revision 00000000
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Ethernet / IEEE 802.3 interface.
2 Serial network interfaces.
32K bytes of non-volatile configuration memory.
4096K bytes of processor board System flash (Read ONLY)
Press RETURN to get started!
Cisco Internetwork Operating System Software
IOS (tm) 3000 Software (IGS-IL), Version 11.0 (4), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1995 by cisco Systems, Inc.
Compiled Mon 18-Dec-95 17:49 by alanyu
I must say that IOS can download not only from the FLASH, but from memory a router as well as the TFTP server. Since this is the first boot router we propose to pass the stages of configuring a router, (and the program runs as a setup). As you can see below the configuration process sufficiently transparent and simple. Once you answer the questions, the program will build config and write it into NVRAM and then it begins to restart. So, we begin configuring the interfaces in the program setup:
--- System Configuration Dialog ---
At any point you may enter a question mark '?' for help.
Refer to the 'Getting Started' Guide for additional help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets'[]'.
Would you like to enter the initial configuration dialog? [yes]: yes
Review the list of interfaces on our router:
First, would you like to see the current interface summary? [yes]:
Any interface listed with OK? value "NO" does not have a valid configuration
Interface IP-Address OK? Method Status Protocol
Ethernet0 unassigned NO not set up up
Serial0 unassigned NO not set down down
Serial1 unassigned NO not set down down
Configuring global parameters:
The name of a router:
Enter host name [Router]:
Introduce the so-enable-secret access to configure the router:
The enable secret is a one-way cryptographic secret used
instead of the enable password when it exists.
Enter enable secret: s1
Then enter enable-password (reviewed for compatibility with older versions of IOS):
The enable password is used when there is no enable secret
and when using older software and some boot images.
Enter enable password: s2
Enter a password for virtual terminal:
Enter virtual terminal password: s2
Allow SNMP, so that we could get statistics:
Configure SNMP Network Management? [yes]: yes
Community string [public]: public1
Our router has only support for IP (not IPX), which we and configure:
Configure IP? [yes]: yes
As with ISP, we will be static routing, we do not include routing protocols:
Configure IGRP routing? [yes]: no
Configure RIP routing? [no]:
Specifies the IP address on Ethernet interface, leaving the interface Serial 0 as unnumbered (what is this, we will deal with it later):
Configuring interface parameters:
Configuring interface Ethernet0:
Is this interface in use? [yes]:
Configure IP on this interface? [yes]:
IP address for this interface: 172.18.5.254 255.255.0.0
This is a figment of your imagination.
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