Cisco Cisco IOS Software Release 12.2(11)YV

When a Flash memory device is full, the files must be rearranged so that the space used by the deleted 
files can be reclaimed. The squeeze feature erases all the deleted files from the router’s file system and 
copies all the valid files from the beginning of the Flash memory. The squeeze operation can take as long 
as several minutes because it involves erasing and rewriting almost an entire Flash memory space. To 
enable this feature, the entire Flash device, including any partitions, has to be completely erased. There 
is a provision in the erase command to disable this squeeze utility.

For information regarding the features supported in Cisco IOS Release 12.2 T, refer to the 
Cross-Platform Release Notes and New Feature Documentation links at the following location on 
Cisco.com:

This URL is subject to change without notice. If it changes, point your web browser to Cisco.com, and 
click the following path:

:

 Technical Documents

:

:

 Release 12.2

:

 Release Notes

:

 

Cross-Platform Release Notes (Cisco IOS Release 12.2T)

Caveats describe unexpected behavior or defects in Cisco IOS software releases. Severity 1 caveats are 
the most serious caveats, severity 2 caveats are less serious, and severity 3 caveats are the least serious 
of these three severity levels.

Caveats in Release 12.2 T are also in Release 12.2(11)YV2. For information on caveats in Cisco IOS 
Release 12.2 T, refer to the 

 document. For information on caveats 

in Cisco IOS Release 12.2, refer to the 

 document. These documents 

list severity 1 and 2 caveats, and are located on Cisco.com and the Documentation CD.

If you have an account with Cisco.com, you can also use the Bug Toolkit to find select caveats of any 
severity. To reach the Bug Toolkit, log in toCisco.com and click Service & Support: Technical 
Assistance Center: Tool Index: Bug Toolkit. Another option is to go to 

.

Cisco IOS Release 12.2(11)YV2 is a rebuild release for Cisco IOS Release 12.2(11)YV. This section 
describes unexpected behavior that is fixed in Release 12.2(11)YV2.

Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol 
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of crafted 
IPv4 packets sent directly to the device may cause the input interface to stop processing traffic once the