Cisco Cisco IOS Software Release 12.0 S

Conditions: The drops are seen only after an increase in the traffic rate and bringing back to normal 
value.

Workaround: There is no workaround.

CSCsl64686

Symptoms: VIP with CHSTM1 crashes on a Cisco 7500 router. 

Conditions: dLFIoLL is configured on a Cisco 7500 router and MDR reload is done on the VIP

Workaround: There is no workaround. 

CSCsb64662

This caveat consists of two symptoms, two conditions, and two workarounds:

Symptom 1: Multicast packets that traverse a Frame Relay virtual circuit (VC) bundle are dropped.

Condition 1: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0S.

Workaround 1: There is no workaround.

Symptom 2: Multicast packets that traverse a Frame Relay virtual circuit (VC) bundle are 
process-switched.

Condition 2: This symptom is observed with Cisco IOS Release 12.3.

Workaround 2: There is no workaround. 

Cisco IOS Release 12.0(32)S15 is a rebuild of Cisco IOS Release 12.0(32)S. The caveats listed in this 
section are resolved in Cisco IOS Release 12.0(32)S15 but may be open in previous Cisco IOS releases. 
This section describes only severity 1, severity 2, and select severity 3 caveats.

CSCek38939

Symptoms: The input error counter may not be incremented for packet errors such as runts, CRC 
errors, and overrun errors.

Conditions: This symptom is observed on a Cisco 7200 series that has an NPE-G1 or a Cisco 3800.

Workaround: There is no workaround. 

CSCsu96698

Symptoms: More specific routes are advertised and withdrawn later even if config 
aggregate-address net mask summary-only is configured. The BGP table shows the specific 
prefixes as suppressed with s>.

Conditions: This occurs only with very large configurations.

Workaround: Configure a distribute-list in BGP process that denies all of the aggregation child 
routes. 

CSCsz71787

Symptoms: A router crashes when it is configured with DLSw.

Conditions: A vulnerability exists in Cisco IOS software when processing UDP and IP protocol 91 
packets. This vulnerability does not affect TCP packet processing. A successful exploitation may 
result in a reload of the system, leading to a denial of service (DoS) condition.