Specifications

1285
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S4
• 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.
Workaround: There is no workaround.
• CSCef78098
Symptoms: An Engine 1 or Engine 2 Gigabit Ethernet (GE) line card may stop switching traffic even
though the line protocol is up. Pings and routing do not work, and traffic does not go through.
Conditions: This symptom is observed a Cisco 12000 series after error recovery and when the
negotiation auto command is not configured for the interface of the GE line card.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface of the line card.
• CSCef80260
Symptoms: IP packets with an IP length that is smaller than 64 bytes and that have the More
Fragments (MF) flag set to 1 do not go through a Cisco 12000 series.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(27)S3 or Release 12.0(28)S1 and that is configured with a 2-port OC-48 DPT Engine
4+ ingress line card.
Workaround: There is no workaround.
• CSCef80349
Symptoms: An MPLS traffic engineering (TE) tunnel may not come back up after a link flaps.