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Cisco Bug: CSCsz35246 - ATM SPA dLFI seq 0x000000 on pkts bigger than frag_size w/o policy cfg

Last Modified

Jan 31, 2017

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases


Description (partial)


A 7600-SIP-200 running dLFI with a SPA-2XOC3-ATM running 122-33.SRB4 may send MLP fragments
with non-incrementing Sequence Numbers of 0x000000 resulting in a violation of Section 
4.1 of RFC RFC 1717. This violation may result in interoperability problems with certain
non-Cisco devices running MLP.


Problem happens with a single ATM VC configured for hardware LFI when a "service-policy"
is not configured on the Virtual-Template interface. Problem is platform-specific to a
SPA-2XOC3-ATM situated in 7600-SIP-200. 

Issue occurs runing 122-33.SRB4, 122-33.SRB5a, 122-33.SRD1, 122-33.SRC3.

This problem does NOT happen when using a Flexwan2/PA-A3 or PA-A6 Port Adapter.
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