Cisco Bug: CSCur64486 - Switch is unable to send packets with payload larger than 1496 bytes.
Dec 01, 2018
- Cisco IOS
Known Affected Releases
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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