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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(31)S6
• CSCsc16910
Symptoms: In an MVPN topology, an Engine 4+ POS line card that is located in the network core
may punt packets with a size of 1477 bytes or more to its CPU.
Conditions: This symptom is observed on a Cisco 12000 series that runs an interim release for
Cisco IOS Release 12.0(32)S.
Workaround: There is no workaround.
• CSCsc34976
Symptoms: A PRP may reload because of a CPUvector 300 error.
Conditions: This symptom is observed on a Cisco 12816 that runs Cisco IOS Release 12.0(28)S1
and that is configured for QoS.
Workaround: There is no workaround.
• CSCsc79397
Symptoms: In an MVPN topology in which routers in the core are configured for PIM sparse mode
with data MDT groups, an interruption in traffic in the core such as a reload of a P router may cause
a PE router to stop sending traffic to the core.
Conditions: This symptom is observed when the traffic interruption causes the traffic to fall back to
the default MDT and PIM sparse mode to enter the registering state. When the traffic resumes before
the multicast route for the data MDT group times out, the traffic is initially forwarded over the
default MDT and then switched to the data MDT, but no PIM registration control packets are sent.
Workaround: Enter the clear ip mds linecard linecard-slot-number in which the
linecard-slot-number argument is the ingress line card on the affected PE router.
Further Problem Description: We recommend the use of Source Specific Multicast (SSM) for data
MDTs. Using SSM, you can avoid the symptoms entirely.
• CSCsd13490
Symptoms: An Engine 2 line card may crash when it receives multicast traffic that is not punted to
the CPU of the line card but switched by the PSA memory of the line card.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(27)S or a later release when the Engine 2 line card is configured with the wrong PSA
memory and when you enable multicast hardware acceleration by entering the hw-module slot
slot-number ip multicast hw-accelerate command.
Workaround: Disable multicast hardware acceleration on Engine 2 line card.
• CSCsd16581
Symptoms: An Engine 3 or Engine 5 line card may crash while processing packets for Output
Sampled NetFlow.
Conditions: This symptom is observed on Cisco 12000 series when Output Sampled NetFlow is
enabled on the Engine 3 or Engine 5 line card and when packets are sampled that are not aligned to
a 2-byte boundary.
Workaround: Disable Output Sampled NetFlow.
• CSCsd21134
Symptoms: A Cisco 12000 series line card may crash while processing packets that are not aligned
to a 4-byte boundary.
Conditions: This symptom is observed when the packet is processed in the CPU of the line card.
Workaround: There is no workaround.
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