Make sure you are using the correct mapping of the
channels.
Check the crossover cable, or just make another one to
exclude cable issue.
Kent
--- "Ken W. Alger" <[EMAIL PROTECTED]> wrote:
> I cannot get my two routers to talk over a CSU/DSU
> connection and cannot
> figure out what I am missing. I get the notice
> "Serial 0 is up, line
> protocol is down" on both routers. I am just
> starting out so I would
> appreciate any advice on items to check in
> troubleshooting this setup.
>
> One router connects to a CSU/DSU running at 64K
> connected to another CSU/DSU
> running at 64K. I can do the loopback tests on the
> CSU/DSUs so I am fairly
> confident that they can communicate, but I could be
> wrong. I have one unit
> set with internal timing. Any advice on what
> problems to look for with this
> connection?
>
> IGS Router (IOS 9.1(8))
> serial0 => TCP/IP 197.168.250.1 /24
>
> 2505 Router (IOS 10.4)
> serial0 => TCP/IP 197.168.250.254 /24
>
> I have changed the encapsulation from HDLC to x25
> and to PPP to no avail.
> My reasoning for these attempts was that in Lammle's
> book he mentions
> CSU/DSUs in the x25 area and I tried PPP because the
> IS manager at my
> company said that he thought that would do it. When
> using x25 I used both
> the default settings for window and packet size as
> well as custom ones.
> Neither produced a working solution.
>
> Using PPP encap I do get various results with the
> "lcp state" information on
> the 2505. It varies from REQSENT to ACKSENT to
> LISTEN, and to the best of
> my knowledge these changes do not happen as a result
> of any other network
> configuration change, i.e. I do a "show int s0" once
> and it will come up
> with "lcp state = REQSENT" and a few minutes latter
> it will come up with
> "lcp state = LISTEN".
>
> I know I am new to this level of networking, but I
> am at a complete loss as
> to what to look for or change. Any help would be
> VERY much appreciate.
> Please reply to [EMAIL PROTECTED] as well as to this
> group.
>
> Thanks,
> Ken W. Alger
>
>
>
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