R2511-HP MSR Router Series Interface Configuration Guide(V5)

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A 3G/4G modem module operates either in PPP mode or Ethernet mode, but not at the same time.
When operating in PPP mode, the modem module is managed in Cellular 0/0 interface view. When
operating in Ethernet mode, the modem module is managed in Cellular-Ethernet 0/0 interface view. You
can set the operating mode of a 3G/4G modem module by using the card-mode command.
When a 3G/4G modem module operates in PPP mode, the link layer protocol is PPP and the network
layer protocol is IP. When the 3G/4G modem module operates in Ethernet mode, the link layer protocol
is Ethernet and the network layer protocol is IP.
Configuring a cellular interface
Follow these guidelines when you configure a cellular interface:
• The USB 3G/4G modem module can be installed only in slot USB 0.
• Do not remove the USB 3G/4G modem module when it is transmitting data. To do so, use the
shutdown command to shut down the modem first.
To configure a cellular interface or cellular Ethernet interface:
Ste
p
Command Remarks
1. Enter system view.
system-view
N/A
2. Specify PPP or Ethernet
encapsulation on the
3G/4G modem module.
card-mode slot slot-num { ppp |
ethernet }
N/A
3. Enter interface view.
• Enter cellular interface view:
interface cellular interface-number
• Enter cellular Ethernet interface
view:
interface cellular-ethernet
interface-number
Use the interface cellular
command if PPP encapsulation is
specified.
Use the interface cellular-ethernet
command if Ethernet
encapsulation is specified.
4. Enable the interface to
accept the IP address
allocated by the peer
through 4G modem
negotiation.
ip address cellular-allocated
By default, an interface does not
accept the IP address allocated by
the peer through 4G modem
negotiation.
5. Set the interface
description.
description text
Optional.
By default:
• The description of a cellular
interface is interface name
Interface, for example,
Cellular0/0 Interface.
• The description of a cellular
Ethernet interface is interface
name Interface, for example,
Cellular-Ethernet0/0 Interface.
6. Set the link layer protocol.
link-protocol ppp
Optional.
The default is PPP.
This setting is available when the
modem operates in PPP mode.