Cisco Cisco IOS Software Release 12.4(4)T

Workaround: There is no workaround. 

CSCsw92379

Symptoms: Many “IP ARP: Sticky ARP entry invalidated” syslog messages appear, and the RP 
reloads unexpectedly.

Conditions: This symptom is observed when a linecard is swapped while thousands of DHCP 
snooping bindings are present and the ip sticky-arp command is configured.

Workaround: Configure the no ip sticky-arp command. 

CSCsx28297

Symptoms: While the atm pvp command is applied under the ATM interface, a router reloads.

Conditions: This symptom is observed while the atm pvp command is applied under the ATM 
interface.

Workaround: There is no workaround.

Cisco IOS Release 12.4(20)T1 is a rebuild release for Cisco IOS Release 12.4(20)T. The caveats in this 
section are resolved in Cisco IOS Release 12.4(20)T1 but may be open in previous Cisco IOS releases. 

CSCee21263

Symptoms: Fragmented packets might be dropped by the router.

Conditions: This is observed with non-initial fragments, when a reflexive ACL is configured on the 
router and the return traffic supposed to be allowed by the reflexive ACL is fragmented. 

Workaround: There is no workaround. However, normal ACLs are not known to exhibit this 
behavior. 

CSCek63963

Symptoms: Router crashes with a traceback decode showing a divide by 0 error.

Conditions: Occurs when a rate-based event is configured for a counter that has a value of 0, such 
as the following scenario:

1. The customer must be using a Cisco IOS Embedded Event Manager (EEM) rate-based Interface 
Event Detector (either applet or Tcl script). Rate-based means use of the “rate” keyword in the event 
specification statement.

2. The rate calculation is attempted after the counters are cleared and before any samples have been 
taken.

Workaround: There is no workaround. 

CSCek64863

Symptoms: DHCP Relay crashes while sending a DHCP offer to the client with binding as relay 
binding. (0.0.0.0).

Conditions: