Specifications

1361
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S1
• CSCed50510
Symptoms: An IPC crash may be seen on a standby RP while upgrading from the gsr-p-mz image
of Cisco IOS Release 12.0(25)S1 to the gsr-p-mz image of Cisco IOS Release 12.0(27)S.
Tracebacks and error messages “%IPCGRP-3-UNKNOWNCMDMSG:” and
“%IPCGRP-3-SYSCALL:” may be seen as well.
Conditions: This symptom is observed on a Cisco 12416 router when following the recommended
upgrade procedure.
Workaround: There is no workaround.
• CSCed51139
Symptoms: A Cisco 12000 series router with an HA configuration (dual RP redundancy) and with
GE line cards which are using channel groups, might not be pingable after a redundancy switchover.
From the interface, the directly connected device can be pinged, but from the same device, the
interface cannot be successfully pinged.
Conditions: The problem is specific to a Cisco 12000 series router that is running Cisco IOS 12.0 S.
The router must have an HA configuration (dual RPs). Also, channel groups must be configured
(note: even if the channel groups are not assigned to a particular Gige interface, the problem can still
occur). Finally, a link flap needs to occur on the channel group interface before the redundancy
switchover is done to bring on the problem.
Workaround: Enter the shut command followed by the no shut command on the interface. Further
Problem Description: The group channel feature is new and was released for the first time in
Cisco IOS Release 12.0(26)S1 so that is where the exposure is.
• CSCed51610
Symptoms: The Cisco 12000 series router Engine 4+ is unable to originate ICMP echo reply packets.
ICMP packets transiting the router are correctly transmitted.
Conditions: This symptom occurs when rate-limit, MQC set, or MQC police commands are
configured on the interface in the output direction.
Workaround: There is no workaround.
• CSCed54236
Symptoms: A Cisco router reloads due to memory allocation problem when per packet load
balancing is changed to default CEF load balancing.
Conditions: This symptom is observed on a Cisco 7200 series router with PA-4T serial adapter when
“service-policy output <name>” is applied to that interface. Problem is observed in Cisco IOS
Release 12.0(26)S1 and Release 12.0 (27)S.
Workaround: Use per-packet load balancing or remove “service-policy output <name>” or replace
adapter with PA-4T+.
• CSCed68450
Symptoms: When removing VP and VC L2 connection on a 4xOC12 E3 ATM, you get a SAR free
channel error message. The connection cannot be set up again properly. Cells are lost if traffic is
sent on this connection.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround.