Specifications

Release Notes for Cisco IOS Release 12.0 S

78-7130-11 Rev. B0

Caveats

• CSCdr28435

If you modify an interface maximum transmission unit (MTU), the saved MTU change is not read

properly from the NVRAM configuration file upon reload. In a large Frame Relay environment, all

Frame Relay links will be in a down state until a manual reconfiguration is done. There is no

workaround.

• CSCdr29259

Interface counters will give incorrect values for tunnels on a serial interface when Cisco Express

Forwarding (CEF) and IP Security (IPSec) are in use. There is no workaround.

• CSCdr34877

A memory leak might occur on a Route Switch Processor (RSP) when it is used with Versatile

Interface Processors (VIPs) while running Open Shortest Path First (OSPF). The problem results

due to repetitive reloading and downloading of VIP linecards that are disabling Cisco Express

Forwarding (CEF) due to a lack of memory.

Use the show processes memory [inc OSPF R] EXEC command and the show memory summary

[inc OSPF R] EXEC command on the RSP to determine if increasingly large amounts of memory

are being held by the OSPF process. Use the show cef linecard EXEC command to determine the

number of reloads that a VIP has encountered.

Workaround: Ensure that the VIPs have sufficient memory for their configuration and environment,

such that CEF is not disabled on the VIP.

• CSCdr35715

Under certain circumstances, a Cisco router might reload when crypto is enabled on a Fiber

Distributed Data Interface (FDDI). There is no workaround.

• CSCdr40080

A Cisco 12000 series Gigabit Switch Router might reload with a bus error at PC 0x600D3ED4,

address 0x1B2DC330. There is no workaround.

• CSCdr44028

If access lists with more than 1000 lines are used on a Cisco router that has compiled access control

lists (ACLs) enabled, changes or additions to the ACLs might cause the router to exhibit a message

similar to the following:

SLOT 0:%SYS-3-CPUHOG: Task ran for 2928 msec (35/5),

Process = TurboACL, PC = 4009274C

-Traceback= 40092754 401AFED4 401AFB18 401B1474 401B2E60 401B2ED8 401B2FEC 40082128

40082114

In some situations, this condition might cause a failure with process keepalive messages that results

in an undesired line protocol down state. There is no workaround.

• CSCdr46190

When attaching a service policy in combination with Multiprotocol Label Switching (MPLS), the

service policy will not take effect until the configuration is saved and the router is reloaded. There

is no workaround.