Appears, the serial cables on the West router is reversed. Move the serial cables around on the West router and that should stop the error. Morevoer, you wouldn't be having IP connectivity now from West to San1 & San2 as the p-t-p links are on different subnet.
Just as the error implies, the router tells you there is a device on the far end of the connection which isn't on the same IP subnet as it's interface is on.
It would be helpful to get the output of show cdp neighbors on each of the routers. I believe that this would demonstrate the point that the earlier posts were making which is that the cables are not connected as intended.
Also the problem has nothing to do with DTE and DCE.
I am not sure if I understand your question correctly.
Anyway, DCE/DTE end isn't the problem here. If there was something wrong there then your interfaces wouldn't have come up.
The problem is the cable that you have coming from San1 is plugged into the Serial interface on West router to which you have assigned an IP address from subnet that's configured for the p-t-p link to San2.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...