Specifications

Caveats for Cisco IOS Release 12.0

78-6455-12

Resolved Caveats—Cisco IOS Release 12.0(6)

• CSCdm45873

If you are redistributing OSPF routes into any other routing protocol, it does not include NSSA

external routes. There is no workaround.

• CSCdm51483

Executing the show ip igmp group command might cause a bus error reload if an IGMP entry is

deleted during the command execution. This condition occurs intermittently. There is no

workaround.

• CSCdm53317

DNS replies that pass from “inside” to “outside” by way of Network Address Translation (NAT)

might not be correctly NAT translated. There is no workaround.

ISO CLNS

• CSCdm45667

Under certain circumstances, Cisco routers running Cisco IOS Release 11.3(9)T can stop receiving

packets on interfaces. This happens when CLNS packets with an N-selector of 0x20 (the DECnet

NSP protocol selector) are received by the router, and DECnet conversion has not been enabled or

configured correctly. If this happens, the show interface command displays a full input queue and

a number of dropped packets (for example, input queue 76/75, 122 drops).

Workaround: Reload the router.

Miscellaneous

• CSCdk45491

A 1-port Fast Ethernet network module (NM-1FE-TX) might fail to auto negotiate properly when

connected through an SMF connector.

Workaround: Manually set the speed to 100.

• CSCdk58186

Half duplex should only be configured on an interface that is configured with a half duplex protocol

(such as SDLC) or bisynchronous encapsulations.

Workaround: Configure the interface for full duplex when not specifically running a half-duplex

protocol. The interface command to do this is full-duplex.

• CSCdk66082

Concurrent routing and bridging (CRB) of IP packets does not work when CEF and ISL are

enabled. IP and ISL packets that are intended to be bridged are dropped as encapsulation drops by

CEF.

Workaround: Turn off CEF.

• CSCdm04861

A race condition can exist between the processes that try to get connection status information from

a VIP (and dropped packet information in Cisco IOS Release 11). A semaphore was added to

prevent multiple processes from accessing the globals used at the same time. There is no

workaround.