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Home » Forums » Forum Archives » Networking and Internet Sharing » Topic # 1883

CISCO Routers ???????
yahoo May-13-02 05:32 PM
I have few questions conserning CISCO routers :
1- how do you connect two Cisco routers : through an uplink---->RJ45 slot using a straight UTP cable or RJ45---->RJ45 using a crossover cable am I right and are ther different ways to connect them ?
2- why we use the console port to connect a terminal to the router ?
3- what's the serial port in the router is used for and is it the same port as a computer's COM port or is it called serial because the transmission is serial ( one bit at a time ) ?

1. RE: CISCO Routers ???????
DJ Net2Infinity May-13-02 05:42 PM
In response to message 0
>I have few questions conserning CISCO routers :
>1- how do you connect two Cisco routers : through an
>uplink---->RJ45 slot using a straight UTP cable or
>RJ45---->RJ45 using a crossover cable am I right and are
>ther different ways to connect them ?

You wouldn't connect 2 routers together.

>2- why we use the console port to connect a terminal to the
>router ?

You use the console port as a management access point for the router.

>3- what's the serial port in the router is used for and is
>it the same port as a computer's COM port or is it called
>serial because the transmission is serial ( one bit at a
>time ) ?

The are used to provide a serial connection to remote sites, or used to connect legacy serial network equipment


2. RE: CISCO Routers ???????
yahoo May-13-02 06:44 PM
In response to message 1
>>I have few questions conserning CISCO routers :
>>1- how do you connect two Cisco routers : through an
>>uplink---->RJ45 slot using a straight UTP cable or
>>RJ45---->RJ45 using a crossover cable am I right and are
>>ther different ways to connect them ?
>
>You wouldn't connect 2 routers together.
>
I think you are completly wrong mister ..we do connect routers together....
>>2- why we use the console port to connect a terminal to the
>>router ?
>
>You use the console port as a management access point for
>the router.
>
that wasn't my question My question is why the console and not another port....
>>3- what's the serial port in the router is used for and is
>>it the same port as a computer's COM port or is it called
>>serial because the transmission is serial ( one bit at a
>>time ) ?
>
>The are used to provide a serial connection to remote sites,
>or used to connect legacy serial network equipment
Again my question is if this serial is the same one in a computer and why it is called serial and we don't use it to connect to a terminal instead of the console for example....

3. RE: CISCO Routers ???????
Twinhead May-14-02 02:00 AM
In response to message 0
Conecting two routers together without a Switch or Hub is done via a Crosscable.

For the other thing, i cannot help you.
See it this way:
ALLWAYS connect a set of two identical devices through a Crosscable.


5. RE: CISCO Routers ???????
DJ Net2Infinity May-14-02 03:41 PM
In response to message 3
Everything that says CISCO on it is not a router, there are PIX firewalls, Switches, Routers with combo switches. You would not connect to routers together ... WHat would be the sense ?????? You can make one of them do anything two of them would do. Secondly the console port is the only port on the router that allows an engineer to configure the IOS of the router. The IOS is a Cisco flavor of unix that runs the switch. Sometimes the console port is connected back to the switch to allow remote administration. The AUX port is used to connected different I/O devices such as firewalls and the like. And no the serial port on the router is not the same as COM1 on your pc, its is a serial interface .. not a serial port. If the routers are connected, please share with me how they are connected?

6. RE: CISCO Routers ???????
Flavah May-19-02 03:58 AM
In response to message 5
Connecting two routers together is fine if they need to. If routers were never connected together, the internet would not exist.
In Yahoo's case, it depends on how many networks (networks meaning a group of hosts under a single broadcast domain) they have and the number of ports available on the routers etc...
Using a crossover to directly connect the routers together works and is simple. You can also use dce/dte cables on the serial ports as well which would save you using an ethernet port.
If your router has an auxiliary user interface (AUI) port you can get different transeivers, I believe, which you could use to connect them together.
You can also connect them if you have WICs installed (Wan Interface Cards) but these are made for WAN connectivity obviously.

"Secondly the console port is the only port on the router that allows an engineer to configure the IOS of the router."
You can also configure cisco routers to accept incoming telnet sessions. (line vty ...) which allows remote administration.

I think the main reason for the console port is security. If anyone could simply access the IOS through any interface, it would leave the router open to a lot of intrusion attempts. Regardless always password protect your routers.

As mentioned above you can use the serial interface to connect directly to another router, or else you can use it for WAN access too, such as frame-relay.


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