Specifications

Caveats for Cisco IOS Release 12.0

78-6455-12

Resolved Caveats—Cisco IOS Release 12.0(5)

• CSCdm08164

When running Cisco IOS Release 12.0(3) on the Cisco 7200 series, it is possible to see periodic

interface resets on DS3-speed links under high interface utilization. This can result in a loss of

keepalives and output drops. There is no workaround.

• CSCdm08728

Cisco router running Cisco IOS Release 11.3(6)T can experience unexpected system restarts when

configured with the crypto IPSec commands. There is no workaround.

• CSCdm09652

In certain topologies, HSRP with RSMs and Token Ring LANE in a Cisco Catalyst 5000 series

switch does not work properly if the LANE connections get interrupted. Connectivity does resume

after a timeout, depending on the end systems used. There is no workaround.

• CSCdm10475

If you reload a Cisco 3600 series router while the PRI D channel is in “STANDBY” or “SHUT”

mode, layer 1 can get stuck in “ACTIVATING” mode. The following error message is displayed:

ISDN Se2/0:23: Could not bring up interface

Workaround: Reload the router, then issue the backup interface command.

• CSCdm11990

DMM modem cards might fail. When the failure occurs, the modem is allocated to an incoming call

and the modem trains up, but no data is received from the client. There is no workaround.

• CSCdm12319

After an undetermined period of time (which can vary depending on whether CET or IPSec is being

used and the length of the key timeouts), encryption might stop working. The symptoms include a

lack of debugs from one of the encryption modules, as well as an interruption of the flow of

encrypted data. Data that should be encrypted is no longer sent because the IPSec negotiation is

never completed. This does not affect nonencrypted data because it continues to be switched by the

router. Only data that would normally be encrypted will not be sent. There is no workaround.

• CSCdm13977

When you use the atg ip default-route command, a tag for the default route is built and traffic

arrives on a virtual circuit (VC), but the traffic is not forwarded by the router. The traffic is only

reported by the show atm vc command but not in the show interfaces stats or

show interfaces atm [slot/port] commands. There is no workaround.

• CSCdm15174

If you load and run Cisco IOS Release 12.0(3.5) images from any code branch (for example

Release 12.0(3.5), Release 12.0(3.5)T or Release 12.0(3.5)S) on RSP platforms, you might find

that the boot variables are not properly set and that reloads of these platforms might not occur as

planned from the configuration written to NVRAM. This is determined by an examination of the

boot variables using the show bootvar command. The following is an example of the output

associated with the show bootvar command:

nu-blab-gw1# show bootvar

BOOT variable = slot1:rsp-jsv-mz.120-3.6,1;slot1:rsp-jsv-mz.120-2.7,1; CONFIG_FILE

variable = BOOTLDR variable = slot0:rsp-boot-mz.120-2.7 Configuration register is 0x2

If the boot variable is not as planned, it is suggested that customers running any RSP Cisco IOS

Release 12.0(3.5) image wait for images that have the fix for this defect.