Serial Interface WIC-2T

thehourman

I am not sure if it's just me, or there is something wrong with my router with WIC-2T.

I have a DTE connected to my 2620 (WIC-2T) s0/0, and the other end DCE on 2621 (WIC-2T) s0/3. EIGRP is running on both routers

2620:
interface Serial0/0
ip address 20.1.1.1 255.255.255.0
end

---

2621:
interface Serial0/3
ip address 20.1.1.4 255.255.255.0
clock rate 128000
end

Now, the interface 2620 with DTE interface is flapping up and down. However, when I used the DCE on 2620 and plugged the DTE to 2621, everything is fine. And I can see 2620's loopback at 2621. 2621 can ping the 2620's loopback interface.

I tried the 2620's s0/1 with DTE and it did the same thing, the interface is flapping up and down. I tried the DCE and it stays up/up. It seems like it does not like the DTE side.

Have you guys encounter something like this?

nerdydad

Yes, and I believe the issue is with the cheap ebay cable, as othe cables worked fine.

thehourman

I figured it out. The one that causing the issue are the WIC-2Ts from 2621 router. For some reason, they can't seem to provide some clocking. However, they do work as DTE just fine.

Also, when I deleted the startup config, it deleted the ios as well. It is a good thing that my 2620 router ios is compatible with 2621.