Notes From Work

Cisco 12000 router OC3 POS interface would come up/up (looped) with 100% good ping to its own internal diagnostic loopback, however, router would not come up/up (looped) and could not ping STS3C software loopback at Sycamore 16000 on other side of fiber crossconnect in same switch site.

The odd thing was that a show controller report was reflecting back that router's information telling us that the router was in fact seeing the software loopback in the Sycamore 16000 proving the fiber crossconnect good. Why would it not come up/up (looped) and ping?

I tore down the crossconnects in the Sycamore and reconfigured the Sycamore port as an OC12 then reconfigured it back again to OC3. I then rebuilt the STS3C crossconnects in the Sycamore and the router is now testing good to the software loopback in the Sycamore. Up/up (looped) with 100% good ping !!!!!!!!!!!!!!!!!.