need more info, but this will get you started.
Platform Command Example
FlexWAN module in Catalyst 6000 family switches and Cisco 7600 series Internet Routers
interface, followed by the type (serial) module/bay/port (module-slot-number/port-adapter-bay-number/interface-port-number)
shutdown
The example is for interface 0 on a port adapter in module slot 5 in port adapter bay 0.
Console# interface serial 5/0/0
Console# shutdown
Ctrl-Z
Console#
Cisco 7200 VXR routers
interface, followed by the type (serial) and slot/port (port-adapter-slot-number/
interface-port-number)
shutdown
The example is for interface 0 on a port adapter in port adapter slot 6.
Router(config-if)# interface serial 6/0
Router(config-if)# shutdown
Ctrl-Z
Router#
Cisco 7201 router
interface, followed by the type (serial) and slot/port (port-adapter-slot-number/
interface-port-number)
shutdown
The example is for interface 0 and interface 1 on a port adapter in slot 1.
Router(config)# interface serial 1/0
Router(config-if)# shutdown
Router(config-if)# interface serial 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#
Cisco 7301 router
interface, followed by the type (serial) and slot/port (port-adapter-slot-number/
interface-port-number)
shutdown
The example is for interface 0 and interface 1 on a port adapter in slot 1.
Router(config)# interface serial 1/0
Router(config-if)# shutdown
Router(config-if)# interface serial 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#
Cisco 7304 PCI Port Adapter Carrier Card in a Cisco 7304 router
interface, followed by the type (serial) and slot/port (module-slot-number/
interface-port-number)
shutdown
The example is for interface 0 on a port adapter in a Cisco 7304 PCI Port Adapter Carrier Card in module slot 3 of a Cisco 7304 router.
Router(config-if)# interface serial 3/0
Router(config-if)# shutdown
Ctrl-Z
Router#
Cisco 7401ASR router
interface, followed by the type (serial) and slot/port (port-adapter-slot-number/
interface-port-number)
shutdown
The example is for interface 0 and interface 1 on a port adapter in slot 1.
Router(config)# interface serial 1/0
Router(config-if)# shutdown
Router(config-if)# interface serial 1/1
Router(config-if)# shutdown
Ctrl-Z
Router#
VIP4-80 or VIP6-80 in Cisco 7500 series routers
interface, followed by the type (serial) and slot/port adapter/port (interface-processor-slot-number/
port-adapter-slot-number/
interface-port-number)
shutdown
The example is for interface 0 on a port adapter in port adapter slot 1 of a VIP installed
in interface processor slot 1.
Router(config-if)# interface serial 1/1/0
Router(config-if)# shutdown
Ctrl-Z
Router#