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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