Possible causes for failures to forward Layer 3 traffic between directly connected interfaces on CE series switches

In V100R002 and later versions, the interface can be switched to the Layer 3 mode through the undo portswitch command. The possible causes for a Layer 3 traffic forwarding failure between interfaces are as follows:
- The interface is connected incorrectly.
- The physical layer status of the interface is Down.
- The interface is not assigned an IP address.
- The IP addresses of interfaces are on different network segments.
You can run the display interface command to check the physical layer status and IP address of an interface.
display
interface 10ge
1/0/1

10GE1/0/1 current state : UP (ifindex:
16)

Line protocol current state :
UP

Last line protocol up time : 2013-12-26
03:20:13

Description:

Route Port,The Maximum Frame Length is
9216

Internet Address is 10.1.1.1/24

IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is
0025-9e01-0205

Port Mode: COMMON FIBER, Port Split:
-

Speed :
10000, Loopback: NONE

Duplex:
FULL, Negotiation:
DISABLE

Mdi
:
-

Last physical up time : 2013-12-26
03:20:13

Last physical down time : 2013-12-26
03:20:02

Current system time: 2013-12-27
01:58:44

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