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As your CCNA / CCNP house lab expands, an entry server such because the Cisco 2509 or 2511 is likely one of the finest investments you may make. On this article, we’ll have a look at the essential configuration for an entry server and talk about how to connect with the opposite routers and switches in your pod by means of the AS.
This is a part of a configuration from certainly one of my entry servers:
ip host FRS 2006 100.1.1.1
ip host SW2 2005 100.1.1.1
ip host SW1 2004 100.1.1.1
ip host R2 2002 100.1.1.1
ip host R1 2001 100.1.1.1
ip host R3 2003 100.1.1.1
interface Loopback0
ip deal with 100.1.1.1 255.255.255.255
no ip directed-broadcast
That is an IP Host desk, and that is what makes the complete AS setup work. Your PC will hook up with the entry server, and the entry server is in flip bodily related to your different routers and switches through an octal cable. One finish of the octal cable splices off into eight separate cables, every terminated with an Rj-45 connector. That connector might be positioned into the console port of certainly one of your house lab units. On this configuration, I’ve connector 1 related to the console port of R1, connector 2 to R2, connector 3 to R3, connector 4 to Sw1, and so forth. (The connectors are bodily numbered as effectively.)
The IP Host desk entries listed below are linked to the loopback deal with proven. The loopback will be any deal with, however it should match the deal with within the IP Host desk. This lets you create reverse telnet classes to the routers and switches.
To open the reverse telnet classes upon opening a connection to the AS, kind the complete title of the system and press the enter key twice. A connection to that system will now be seen, as proven right here:
Access_Server#r1
Making an attempt R1 (100.1.1.1, 2001)… Open
R1#
To get again to the entry server, use the important thing mixture adopted by urgent the “x” key. Hold doing this till you’ve got opened a connection to each router and swap in your pod.
As soon as you’ve got opened the traces, you’ll not use the total system title to connect with the house lab units. You need to press solely the quantity comparable to the reverse telnet session you opened. As an illustration, on this configuration I opened telnet session 1 to R1, session 2 to R2, and session 3 to R3. As soon as I opened these classes, I simply use these numbers to reconnect to the units, as proven right here:
Access_server#1
[Resuming connection 1 to r1 … ]
R1#
Access_server#2
[Resuming connection 2 to r2 … ]
R2#
Access_server#3
[Resuming connection 3 to r3 … ]
R3#
If you happen to kind the total hostname once more after initially opening the connection, you will note this message:
Access_server#r1
Making an attempt R1 (100.1.1.1, 2001)…
% Connection refused by distant host
The connection is refused as a result of you have already got an open connection to that router.
There’s another necessary a part of an entry server config your CCNA / CCNP house lab will want:
line 1 8
no exec
transport enter all
The road numbers could differ in keeping with your entry server, however “no exec” is essential right here. It will cease rogue EXEC classes from refusing connections that it should not be refusing. With out this command, you may generally see “connection refused by remote host” whenever you should not be. That message is the commonest error you may see on an entry server, and it is there as a result of you have already got an open connection otherwise you left “no exec” out of your configuration. “No exec” is not necessary, however it can enable you hold your sanity!
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