Cisco IOS Release 12.2(33)SB2 is a rebuild release for Cisco IOS Release 12.2(33)SB. This section
describes a severity 2 caveat that is open in Cisco IOS Release 12.2(33)SB2. There are other open
caveats in Cisco IOS Release 12.2(33)SB2. However, open caveats are normally listed only for
maintenance releases, and the listing of CSCsu81943 is an exception.

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CSCsu81943

Symptoms: Packet buffering is happening on the ATM line card in the transmit direction. Packets
get dropped at LC with “No buffer” as reason in the transmit direction. This causes latency and
packet drops for PQ and non-PQ traffic.

Conditions: The issue occurs when traffic sent to the VC is higher than what VC can support.

Problem is specific to ATM line cards with vbr-nrt configuration and on PRE-4. And the problem is
seen only when traffic per-vc is high enough to cause buffering at LC. Problem happens only if the
traffic is continuous and high. If the traffic is bursty, then between bursts, there may be enough time
for the LC to drain packets, and we will not experience high latency.

Workaround: There is no workaround.

Resolved Caveats—Cisco IOS Release 12.2(33)SB2

Cisco IOS Release 12.2(33)SB2 is a rebuild release for Cisco IOS Release 12.2(33)SB. The caveats in
this section are resolved in Cisco IOS Release 12.2(33)SB2 but may be open in previous Cisco IOS
releases.

Miscellaneous

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CSCsa98164

Symptoms: When the boot config file-system-prefix filename nvbypass command is enabled, no file
is created on a secondary Route Processor (RP).

Conditions: This symptom is observed on a Cisco 10000 series that is configured with two PREs
that function in RPR+ mode but may also occur on other platforms that are configured with
redundant RPs.

Workaround: There is no workaround.

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CSCse99493

Symptoms: A router that is configured for NAT Overload may crash while performing dynamic
translation from many ports to one port.