Depends on the IOS version
In earlier ( 11.3 and earlier, if memory serves ) you can have what I call
the "phantom clockrate"
Swap the cable ends, and watch the clockrate appear on that interface where
the command "would not take".
Swap again, and watch the command disappear again.
This was corrected in 12.x
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of J
Roysdon
Sent: Wednesday, January 17, 2001 10:52 PM
To: [EMAIL PROTECTED]
Subject: Re: home lab
Bad info about back to back 2500s. I'm using them in my home lab:
2501 dce:
interface Serial0
no shutdown
ip address 172.16.0.1 255.255.255.252
clockrate 4000000
2502 dte:
interface Serial0
no shutdown
ip address 172.16.0.2 255.255.255.252
With that and the dte/dce back to back cable, it just came up.
2501#sh contr serial
HD unit 0, idb = 0x93830, driver structure at 0x97BC8
buffer size 1524 HD unit 0, V.35 DCE cable, clockrate 4000000
*snip*
2502#sh contr serial
HD unit 0, idb = 0xB9694, driver structure at 0xBE418
buffer size 1524 HD unit 0, V.35 DTE cable
*snip*
Doesn't reflect what's plugged in regarding DTE vs. DCE. The 2501 end is
DCE, the 2502 is DTE. However, if you notice the difference between the
lines: 2501 DCE device has clockrate specified. Also, no matter what
clockrate I specify on the DTE side, it will not take the command (no error,
just never sets it, as clockrate is set by the DCE).
HTH
--
Jason Roysdon, CCNP/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
"Flem" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Charles ,
>
> Inline ..
>
> --- Charles Paver <[EMAIL PROTECTED]> wrote:
> > Hi! I am having some difficulty in setting up my
> > lab
> > at home, and need some good advice. I have two
> > pc's,
> > 2 routers, and one switch. I just want to work on
> > the
> > routers for now, though. Just established a network
> > with them, and can telnet into the router. I have a
> > 2514 router with 2 serial and 2 ethernet ports, and
> > also a 2504 with 1 token ring and 2 serial. I also
> > have one cross over cable (dce to dte), one rollover
> > cable as well. My questions are:
> >
> > 1. on the 2514, I can't enable ospf. You know how
> > you type in router ospf (as#)? well, when i do
> > that,
> > i do not get a router-config> prompt. But with
> > eigrp or rip I do. I wanted to practice ospf, but
> > cant without getting into that mode!
>
> What do you get when you type in router ospf ### ?
> Message of some sort :-)
>
> >
> > 2. how do i connect the two routers? I know i use
> > the serial calbe, but which router gets the dte or
> > dce? i reda that all routers are dte, and therefore
> > need to have the clock rate set if not using the
> > dce!
> > So, on this router 2514 when i teyped in show int
> > s0,
> > it says down, down. Now, I went into interface
> > mode,
> > and did a no shutdown. And then I assigned it an ip
> > address. But, i cant do anything til i get that
> > interface up.
> >
>
> Router is by default nothing :-)
> Router will detect what cable is plugged in .
> You can see that with sh controllers ...
> Put dce cable in one and dte in the other .
> Set clock on the dce router , configure a similar
> protocol , ppp or hdlc and things should come up/up.
>
> > 3. once they are connected (if i cant use ospf, ill
> > settle for eigrp :>), then what? This ccnp stuff is
> > really hard without the materials (such as frame
> > lines
> > coming into the house, or csu/dsu's!!)
> >
>
> Don't now about ccnp .
> Then ... coffee I suppose .
>
> > 4. I just bought an external modem, so I can dial
> > in
> > to the router. Anyone know how to set this up to
> > simulate a t1 coming in? Such as, from my 56k phone
> > line to the external modem to the serial port? Or
> > is
> > my logic flawed?
> >
>
> No way to simulate T1 with a dialup connection . Think
> you can put a t1 back-to-back but not with c2500 . I
> saw a guy do it once with two c4500 .
>
>
> flem
> > Any advice is very, very appreciated! You guys are
> > awesome!
> >
> > __________________________________________________
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> >
> > _________________________________
> > FAQ, list archives, and subscription info:
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>
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