in addition to the other posts, I think the Setup Command Facility puts that clockrate on the router by default. I have seen numerous routers configured with the Setup Command Facility, and the serial interfaces look like this by default:
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip route-cache flow
no cdp enable
Check the link below and scroll down a few lines, it shows you that the Setup Command Facility sets the clockrate to 2000000 by default.
Configuration: Basic Software Configuration Using the Setup Facility
the config was done using CLI and a text-file, not using the setup-facility.
I tried to connect the V.35 DTE cable and reload the router and the "clockrate 2000000" DISAPPEAR from sh run.
description service FR
no ip address
encapsulation frame-relay IETF
interface Serial0/0/0.51 point-to-point
description link fr con bassano cir 128k
ip address 172.16.1.22 25
milano-1841#sh controllers s0/0/0
Hardware is GT96K
DTE V.35 clocks stopped.
idb at 0x62A4A698, driver data structure at 0x62A51E04
I think that if the interface s0/0/0 does not know what will be her type she set itself to DCE with a default clokrate.
THIS BEHAVIOR IS DIFFERENT FROM THE OTHER ROUTERS I HAVE SEEN BEFORE. FOR EXAMPLE I TRIED WITH A CISCO2621 IOS 12.2(12) SAME CONFIG FILE, SAME WIC-1T AND NO SERIAL CABLE ATTACHED -> IN SH RUN DOES NOT APPEAR ANY CLOCKRATE !!
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