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Cisco Bug: CSCur64486 - Switch is unable to send packets with payload larger than 1496 bytes.

Last Modified

Feb 26, 2018

Products (1)

  • Cisco IOS

Known Affected Releases

15.2(2.0.0) n/a

Description (partial)

Symptom:
Packets with a layer 3 payload (that is, payload beyond the L2 headers) larger than 1496 bytes are dropped by 3560-X switches with UPoE when those packets are sent through a trunk port with an 802.1q tag. This means packets with a dot1q header that are larger than 1514 bytes are dropped by the receiving switch.

Conditions:
The issue is seen when two 3560-X / 3750-X UPoE series switches are put back-to-back with an 802.1q trunk, and packets are sent with a VLAN header.  

The issue is not seen when a 3560-X switch is trunked to another type of switch (e.g., a 3560CG series) or when 3560-X non-UPoE switches are used.
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