Specifications

1136
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S2
Workaround: Disable the CEF table consistency checker so that no passive scan check is performed
of tables of the line cards.
• CSCef68324
Cisco Internetwork Operating System (IOS) software is vulnerable to a Denial of Service (DoS) and
potentially an arbitrary code execution attack from a specifically crafted IPv6 packet. The packet
must be sent from a local network segment. Only devices that have been explicitly configured to
process IPv6 traffic are affected. Upon successful exploitation, the device may reload or be open to
further exploitation.
Cisco has made free software available to address this vulnerability for all affected customers.
More details can be found in the security advisory that is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050729-ipv6.shtml.
• CSCef69146
Symptoms: A Cisco 12000 series crashes when the encapsulation of T1 channels is changed to MFR
during a cut-and-paste operation of the configuration or when you copy from a file to the running
configuration.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(28)S1 and that is configured with a 1-port channelized OC-12/STM-4 (DS1/E1) ISE
line card when the configuration is changed at a fast pace. When the configuration lines are entered
at a slower pace, the symptom does not occur.
Workaround: Avoid pasting configuration files to the 1-port channelized OC-12/STM-4 (DS1/E1)
ISE line card. If this is not an option, there is no workaround.
• CSCef72305
Symptoms: A standby PRE crashes on bootup.
Conditions: This symptom is observed on a Cisco 10000 series that is configured with 1000 ATM
VCs when a forced SSO switchover occurs.
Workaround: There is no workaround.
• CSCef72411
Symptoms: Line cards and the standby RP on a Cisco 12000 series may fail when an RP switchover
occurs.
Conditions: This symptom is observed on a Cisco 12000 series that runs a Cisco IOS interim release
for Release 12.0(30)S and that has two PRPs when you enter the redundancy force-switchover
command. Note that this caveat is resolved in Release 12.0(30)S.
Workaround: There is no workaround.
Further Problem Description: The fix for this caveat enables the RP to recover from a Fabric
Interface ASIC (FIA) halt condition if this condition occurs following an RP switchover. In a Cisco
IOS software release that does not integrate the fix for this caveat, the RP does not attempt to recover
from a FIA halt condition after an RP switchover has occurred (but it does attempt to recover from
such a conditions in other situations).
• CSCef72555
Symptoms: When you change the Cisco IOS software image on a Cisco 10000 series, HA may
function differently, causing strange behavior, a standby crash, or both.
Conditions: This symptom is observed when you change the Cisco IOS software image on a
Cisco 10000 series from one release train to another release train. This symptom affects
Release 12.0S, Release 12.2S, releases that have been derived from Release 12.2 releases, and
releases that have been derived from Release 12.3.