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Cisco Bug: CSCut40421 - Padding is not working for less than 64 bytes packets

Last Modified

Sep 06, 2018

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases

15.1(2)SY2.1 15.1(2)SY5.1 15.2(1)SY

Description (partial)

Symptom:
Packet drops are seen when a small packet ( CRC + data + additional tag, e.g vlan,mpls,gre etc = 64 B) comes inside a switch and has to go out through a 10G/40G port after additional tag is removed. Packet should go out of the switch with a minimum size of 64 bytes. If the packet size is less than 64 bytes after removal of additional tags then switch should pad the packet.

Conditions:
This bug is applicable for egress traffic 10gig/40gig ports. Please check the list of affected linecards and versions below to verify exposure to this defect.

1. 64B Packet ingresses on trunk interface (60byte packet + 4 byte vlan tag) and egresses out l3 interface or access port , should be padded with 4 byte padding or
2. 64B packet ingress on mpls interface(60byte packet + 4 byte mpls label) and egress out as IP packet.
3. Same example holds good for GRE and other encapsulated packets as well.
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