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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(32)S
Workaround: Reload the line card to bring up the controllers and interfaces.
• CSCsb12969
Symptoms: All VIPs or FlexWAN modules reload unexpectedly on a platform that is configured for
Modular QoS CLI (MQC).
Conditions: This symptom is observed on a Cisco 7500 series (with VIPs) and a Cisco 7600 series
and Cisco Catalyst 6500 series (both with FlexWANs) when the following steps occur while the
physical interface is in the UP state:
1. An input policy and output policy map are already attached to an ATM or Frame Relay PVC.
When you attach the same policy map to the main interface, an error message is generated and
the configuration is rejected.
2. You remove the policy map from the PVC and attach the same policy map to the main interface.
3. You remove the policy map from the main interface.
At this point, all VIPS or FlexWAN modules reload, even though no traffic is being processed during
the above-mentioned steps.
Workaround: There is no workaround.
• CSCsb14213
Symptoms: When IPv4 multicast packets have a resultant IP checksum of “FFXX”, the checksum
becomes corrupt.
Conditions: This symptom is observed on a Cisco 10720 that runs Cisco IOS Release 12.0(31)S.
Workaround: There is no workaround.
• CSCsb17153
Symptoms: A serial interface that is configured for CRC-16 may revert to CRC-32 when a router
reloads.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(31)S when you configure a serial interface on a 4-port channelized T3 to DS0 SPA that
is installed in a SIP-400 for CRC-16. When the configuration is saved and the router reloads, the
interface comes up configured for CRC-32.
Workaround: There is no workaround.
• CSCsb17203
Symptoms: A Cisco 12000 series that is configured with dual PRPs, that has more than one
10G Engine 5 SPA Interface Processor (12000-SIP-600), and that has a 10-port Gigabit
Ethernet (SPA-10X1GE) installed in each 12000-SIP-600 may not load one of the SPA modules
after a cold boot.
Conditions: The symptom is observed only when the Cisco 12000 series is powered off and powered
back on. The symptom does not occur on a Cisco 12000 series that is configured with a single PRP.
Workaround: Reload the router via a warm reload.
Further Problem Description: The symptom is related to a race condition that is only observed on
the Cisco 12000 series. The symptom is more likely to occur when timing becomes an issue, for
example, in a configuration with a large number of interfaces as described in the Symptoms above.
However, the root cause of this race condition is platform-independent and relates to the interface
IfIndex synchronization. This is the reason why the fix for this caveat is integrated in releases that
do not support the Cisco 12000 series.
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