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MPLS packets are sent on interface even though MPLS is deactivated on device

Publication Date:  2017-06-30 Views:  212 Downloads:  0
Issue Description

MPLS packets can be seen on interfaces, for example on an interface connected to ISP. MPLS is deactivated on device, but ISP claims that MPLS packets are seen on the interface and this affects the normal behavior of the connection. At a closer look on packets captured on the interface MPLS label 8 type of packets are seen on the interface. Further checking the configuration on NE device there is no MPLS running.

 

14:05:10.442970 MPLS (label 8, exp 7, [S], ttl 1)       
0x0000:  0000 8f01 0100 0008 004a fa7a 0bb8 0006  .........J.z....       
0x0010:  0000 0000 0000 0000 0000 0000 0000 0000  ................       
0x0020:  0000 0000 0000 0000
0000                
..........

14:05:13.446361 MPLS (label 8, exp 7, [S], ttl 1)       
0x0000:  0000 8f01 0100 0008 004a fa7a 0bb8 0006  .........J.z....       
0x0010:  0000 0000 0000 0000 0000 0000 0000 0000  ................       
0x0020:  0000 0000 0000 0000
0000                
..........

 

 

 

Handling Process

Checking the complete NE configuration there was configured on each interface “dcn” command.

interface GigabitEternet x/x/x

 ip address x.x.x.x 255.255.255.255

 dcn



DCN function make use of MPLS type 8 packets and sends them on the interfaces.

Root Cause

If DNC is not used, then it needs to be deactivated either globally or on the interface. Then MPLS unwanted packets won’t be sent on the interface.

Disable globaly:

<HUAWEI> system-view

[~HUAWEI] undo dcn

Warning: This operation will disable DCN function.Continue? [Y/N]:y

Disable on interfaces:

<HUAWEI> system-view

[~HUAWEI] interface gigabitethernet x/x/x

[*HUAWEI-GigabitEthernet0/1/0] undo dcn

END