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Cisco Bug: CSCuq02795 - PXE TFTP fails in ZBF (zone based firewall) running 15.x code

Last Modified

Sep 13, 2019

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Routers running 15.x code using ZBF with TFTP inspect may encounter problems with passing PXE traffic.  This leads to computers not being able to utilize PXE during boot.  The router may report the TFTP packet as being dropped.

For example:

FW-6-DROP_PKT Dropping udp session on zone-pair in-out class class-in-out  with ip ident 0

- Routers running 15.x code
- Zone based firewall
- TFTP inspect
- PXE traffic in the network
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  • Status
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