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giant packet error with mpls mtu 1600

Does anyone know what's wrong here ?

COREIBVST002#ping vrf PRS-netwerk

Protocol [ip]:

Target IP address: 10.2.32.2

Repeat count [5]:

Datagram size [100]: 1526

Timeout in seconds [2]:

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 1526-byte ICMP Echos to 10.2.32.2, timeout is 2 seconds:

030554: May 12 11:20:42.307 WET: %CONTROLLER-3-TOOBIG: An attempt made to send giant packet on GigabitEthernet1/16 (1600 bytes from 82F4FE2, max allowed 1572)

-Traceback= 417E3F70 4162EF1C 4077F858 4077E594 40793844 40783AE4 40783738 4138C974 4138C0D0 40FCE424 4046DF84 404614F8 40470F74 40FC6C78 40FC6C64.

030555: May 12 11:20:44.307 WET: %CONTROLLER-3-TOOBIG: An attempt made to send giant packet on GigabitEthernet1/16 (1600 bytes from 82EDDE2, max allowed 1572)

-Traceback= 417E3F70 4162EF1C 4077F858 4077E594 40793844 40783AE4 40783738 4138C974 4138C0D0 40FCE424 4046DF84 404614F8 40470F74 40FC6C78 40FC6C64.

030556: May 12 11:20:46.307 WET: %CONTROLLER-3-TOOBIG: An attempt made to send giant packet on GigabitEthernet1/16 (1600 bytes from 82CAB02, max allowed 1572)

-Traceback= 417E3F70 4162EF1C 4077F858 4077E594 40793844 40783AE4 40783738 4138C974 4138C0D0 40FCE424 4046DF84 404614F8 40470F74 40FC6C78 40FC6C64.

030557: May 12 11:20:48.307 WET: %CONTROLLER-3-TOOBIG: An attempt made to send giant packet on GigabitEthernet1/16 (1600 bytes from 82F6542, max allowed 1572)

-Traceback= 417E3F70 4162EF1C 4077F858 4077E594 40793844 40783AE4 40783738 4138C974 4138C0D0 40FCE424 4046DF84 404614F8 40470F74 40FC6C78 40FC6C64.

030558: May 12 11:20:50.307 WET: %CONTROLLER-3-TOOBIG: An attempt made to send giant packet on GigabitEthernet1/16 (1600 bytes from 82F3362, max allowed 1572)

-Traceback= 417E3F70 4162EF1C 4077F858 4077E594 40793844 40783AE4 40783738 4138C974 4138C0D0 40FCE424 4046DF84 404614F8 40470F74 40FC6C78 40FC6C64.

Success rate is 0 percent (0/5)

COREIBVST002#

1 REPLY

Re: giant packet error with mpls mtu 1600

Hello,

oops sorry for the post in the other thread, I overlooked the 1526 ...

So let us calculate:

1526 Byte datagram + (presumably 2 labels) 8 Byte + 18 Byte (ethernet)= 1552 Byte

So 48 Byte missing (1600 - 1552) to get the value in the Error message. This IS puzzling. What about dot1Q or ISL headers? How many labels are used (show ip cef vrf PRS-netwerk 10.2.32.2 detail)?

Regards, Martin

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