troubleshooting Serial interface!

From: KSGoh (kianseng.goh@gmail.com)
Date: Fri Dec 23 2005 - 19:50:44 GMT-3


have the following problem on my R1, R2 just show int up/down and without any
other error message..

00:25:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to down
00:25:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to up
00:25:40: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to down
00:25:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to up
00:26:10: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to down
00:26:20: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed
state
 to up

my config is very simple...
on R1
interface Serial1
 ip address 10.100.100.1 255.255.255.0
 clockrate 64000
end

on R2
interface Serial1
 ip address 10.100.100.2 255.255.255.0
end

any idea how can i troubleshoot this ?
i tried debug int s 1
but nothing comes out..



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