Specifications

1314
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S3
Workaround: Remove the xconnect destination-address vc-id encapsulation mpls command from
the (sub)interface that connects to a customer device, and reconfigure it on the (sub)interface.
• CSCee75225
Symptoms: High CPU utilization may cause interfaces to flap, and the following spurious memory
access messages may be generated:
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x603C2724 reading 0x194
%ALIGN-3-TRACE: -Traceback= 603C2724 601D2888 601D40B4 00000000 00000000 00000000
00000000 00000000
Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS
Release 12.0(23)S when you the clear cef linecard command.
Workaround: There is no workaround.
• CSCee76306
Symptoms: A Cisco router crashes during a period of high routing protocol activity.
Conditions: This symptom is observed on a Cisco 10720 that runs Cisco IOS Release 12.0(21)SP or
a later release or Release 12.0(22)S or a later release.
The crash is most likely to occur when the router holds a large number of IPv4 prefixes in its routing
table and when there is a lot of turnover in the routing table, that is, prefixes are added and deleted
on a rapid basis.
Workaround: There is no workaround.
• CSCee76476
Symptoms: A Cisco 12000 series equipped with Engine 4 or Engine 6 line cards may crash because
of an unexpected exception to CPU vector 300 when the CISCO-CLASS-BASED-QOS-MIB is
queried via SNMP.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(26)S or an earlier 12.0 S release.
Workaround: There is no workaround other than excluding the access to the MIB.
• CSCee76995
Symptoms: A packet becomes corrupted when you ping a POS line card.
Conditions: This symptom is observed on a Cisco 12000 series Engine 0 4-port OC-3 POS line card.
It only affects a Cisco IOS interim release of Release 12.0(29)S.
Workaround: There is no workaround.
• CSCee77227
Symptoms: When a channel group is removed and re-added to the controller, and then a PRE
switchover occurs, the PPP line protocol on the re-added channel goes down after a while.
Conditions: This symptom is observed on a Cisco 10000 series that is configured with 24-port
channelized E1/T1 line cards.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface.
• CSCee77328
Symptoms: The PXF forwarding engine on a Cisco 10720 may crash after the microcode is reloaded
either through a manual reload by entering the microcode reload pxf command or after a previous
PXF crash. This situation causes multiple PXF crashes.