Serial0/0 is up, line protocol is down

From: Xiaobo Zhu (xiaobo@zhu.net)
Date: Sat Mar 07 2009 - 08:27:41 ARST

R1's s0/0 is connected to R2's s0/0 directly, and configured as follows,
will any one please figure out why the interface status is up but protocol
status is down?

R1(config-if)#do sh contr s0/0
Interface Serial0/0
Hardware is PowerQUICC MPC860
DTE V.35 RX clock detected.

R1(config-if)#do sh run int s0/0
Building configuration...
Current configuration : 73 bytes
!
interface Serial0/0
 ip address 12.0.0.1 255.0.0.0
 no fair-queue
end

R2(config-if)#do sh contr s0/0
Interface Serial0/0
Hardware is PowerQUICC MPC860
DCE V.35, clock rate 64000
idb at 0x82C0C31C, driver data structure at 0x82C140F0
SCC Registers:

R2(config-if)#do sh run int s0/0
Building configuration...
Current configuration : 95 bytes
!
interface Serial0/0
 ip address 12.0.0.2 255.255.255.0
 clock rate 64000
 no fair-queue
end
R1#sh ip int b
Interface IP-Address OK? Method Status
Protocol
Ethernet0/0 unassigned YES NVRAM administratively down
down
Serial0/0 12.0.0.1 YES manual up
up
Ethernet0/1 unassigned YES NVRAM administratively down
down

R2(config-if)#do sh ip int b
Interface IP-Address OK? Method Status
Protocol
Ethernet0/0 unassigned YES NVRAM administratively down
down
Serial0/0 12.0.0.2 YES manual up
down
Serial0/1 unassigned YES NVRAM administratively down
down 

-- 
Xiaobo Zhu

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