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El viernes lleg el 3com 4500, switch layer 2/3 administrable. Es un switch que promete mucho cuando se

trata de aliviar la congestion de la red, con uplinks de 1 Gigabit, manejo de capa 3, listas de control de acceso

(ACL), calidad de servicio (QOS), preparado para VoIP, administrable por SMNP

Administrable una vez que logras entrar! Bajemos el manual pues

Una hora mas tarde, la Gua de Referencia Rpida, la Gua de Referencia de Comandos y la Gua de Configuracin

mostraban con que prolijidad se puede hacer documentacin, pero sin dejar muy claro cmo se hacen las cosas

esenciales.

Resumiendo:

1. Conecte el cable de consola al switch y al puerto serie de la PC, con el switch apagado ;

2. Use un programa de comunicaciones (como HyperTerminal) con estos parmetros: 19200, 8, N, 1, sin

control de flujo;

3. Encienda el switch , que presenta toda la informacin del arranque y nos invita amablemente a presionar

ENTER;

4. Usern ame: admin, Password: en blanco por defecto, no encontr nada en la documentacin;

5. Disfrtelo!

An no se puede administrar para ello hace falta asignar una IP a la VLAN, pero eso es otro captulo de la

historia.

Continuando 3com 4500 Administrable

Luego de conectarse al switch por el puerto serie, podemos asignar una IP a la VLAN para continuar la

configuracin via web:

1. Presionar ENTER para obtener un prompt;

2. Si an no esta logueado:

Username: admin

Password: (en blanco por defecto);

3. Entramos a la configuracion:

system-view

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4. Configuramos una IP para la Vlan 1 (p. ej. 192.168.1.5):

[4500] interface vlan-interface 1

[4500-Vlan-interface1] ip address 192.168.1.5 255.255.255

[4500-Vlan-interface1] quit

5. Agregamos una ACL para ingresar via web (ej. acl 2080 para ingresar desde la ip 192.168.1.110):

[4500] ip http acl 2080

[4500] acl number 2080

[4500-acl-basic-2080] rule 0 permit source 192.168.1.110 0

[4500-acl-basic-2080] rule 1 deny

[4500-acl-basic-2080] quit

[4500] user-interface vty 0

[4500-ui-vty0] acl 2080 inbound

[4500-ui-vty0] authentication-mode scheme

[4500-ui-vty0] set authentication password simple xxxx

[4500-ui-vty0] quit

6. Configuramos la contrasea del usuario admin:

[4500] local-user admin

[4500-luser-admin] password simple mynewpass

[4500-luser-admin] quit

7. A partir de aqu ya podemos conectarnos via web poniendo la IP del switch en el navegador, con el usuario

y contrasea que configuramos, y la primera tarea imprescindible es guardar la configuracin del switch;

8. Notas:

1. El prompt del switch va variando segn el entorno;

2. La Vlan por defecto es la 1 y no se puede eliminar;

Disclaimer: estos pasos pueden contener alguna imprecisin dado que estn tomados de memoria de hace un

par de meses aunque contrastados con el propio archivo de configuracin del switch.

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Como conectarse

Using HyperTerminal inWindows to Access 3comSwitch

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An initial, basic configuration on a 3com switch is fairly simple. Youwill need a serial cable to connect a computer to the 3com switch in orderto access the switch through HyperTerminal. HyperTerminal can be foundon windows by clicking START , go to PROGRAMS , thentoACCESSORIES , then go to COMMUNICATIONS , and clickonHyperTerminal . After the program appears, make up a name and enter

it in the space provided, choose an icon thenclick OK.

Look in the drop down menu

at Connect using: .Choose the port thatyour serial cable ishooked to on yourcomputer (usuallyCOM1) from the switch.Then click OK .

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Click Restore Defaults , then click OK . You now have an openconnection to the 3com Switch. Now, hit enter until you have a login

prompt.

Configuring the switch at the Command Line in HyperTerminal

At the login prompt, type admin , then hit enter. At the password prompt, just hit enter. Initially, there is no password. You are now loggedon to the 3com switch and can start configuring. The switch may beconfigured in any order.

There are 3 basic items that need to be configured: 1) Enter a system password.2) Enter system information.

3) Enter IP information.

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System Password

To set a system password, at the top-level menu, type systempassword then hit enter. It will then prompt you to enter the old password(if this is the first time, just press enter), enter your old password and hitenter. It will then prompt you to enter a new password, enter a new

password, and when prompted enter the new password again. After youenter the new password a second time, it will display The command lineinterface password has been successfully changed .

System Information

At the top-level menu, type system information or type sys info forshort, as long as you type enough information to uniquely identify eachword, you will get the same results. After you hit enter, you will be

prompted to enter a name for the system. Any name you wish to use toidentify your switch may be used, then press enter. Now, the prompt is

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asking for a contact. A persons name to contact if something happensneeds to be entered here. Finally, the last prompt asks for a location. Justenter a room number or place where the switch can be found.

IP Information for the switch

At the top-level menu, type ip interface define and hit enter. It will prompt you to enter an ip address. Enter the ip address you want to assignto the switch, in our case we used 205.174.50.108 , then press enter. Nowyou will be prompted to enter the subnet mask. Enter the appropriatesubnet mask, in our case it was 255.255.255.0 . Press enter and you will be

prompted for a default gateway. Enter the appropriate gateway, in our caseit was 205.174.50.1 , and hit enter. For the next two prompts, SLIP IP andSLIP subnet mask, just enter through. After entering through the SLIP

prompts, the system will display all the items related to ips for the switch.