Specifications

Caveats for Cisco IOS Release 12.0

78-6455-12

Resolved Caveats—Cisco IOS Release 12.0(11)

• CSCdr13715

Due to new RFC 2328, the calculation of summary route costs have changed. This situation might

create suboptimal routing, if all of the area border routers (ABRs) are not upgraded to the new code

at the same time.

Workaround: Upgrade all of the ABRs to the new code.

Miscellaneous

• CSCdk34319

After highly stressing packets through a PA-A3 on a Cisco 7200 series router, if you remove the

card and reinsert it to a different slot with a new configuration on the same interface at the new slot,

the router might reload with the following error patterns occurring on the console:

%SYS-2-LINKED: Bad enqueue of 60DFD980 in queue 60CCFB30 -Process= “<interrupt level>”,

ipl= 1 -Traceback= 602398F0 601C1370 602000C8 60203958 601C4408 601C81B0

%SYS-2-BADSHARE: Bad refcount in retparticle, ptr=14AF, count=0 -Traceback= 601C14FC

602000C8 60203958 601C4408 601C81B0

There is no workaround.

• CSCdm61723

A reverse telnet to the modem on a Cisco 2600 series router that is running Cisco IOS

Release 12.0(5.2)T and that is configured with an NM-8A/S network module interface, does not

work. This situation does not occur in earlier Cisco IOS releases. There is no workaround.

• CSCdp19299

Pings fail with IP Security (IPSec) when you configure fast switching or flow switching. The router

exhibits the follow message:

%IPFAST-2-PAKSTICK: Corrupted pak header for xxx, flags 0x80

Workaround: Use Cisco Express Forwarding (CEF) switching.

• CSCdp54039

On Cisco routers that are running Cisco IOS Release 12.0(8), IP Security (IPSec) will send in the

clear packets that need to be encrypted and fragmented. There is no workaround.

• CSCdp78040

A Cisco Route Switch Processor (RSP) that is configured with a Multiprotocol over ATM (MPOA)

Client might occasionally reload. There is no workaround.

• CSCdp78051

A Cisco Route Switch Processor (RSP) that is configured with a Multiprotocol over ATM (MPOA)

client might have spurious memory access. This situation might degrade MPOA shortcut

performance. There is no workaround.

• CSCdp84053

On a Cisco 2600 series router that is running Cisco IOS Release 12.0(8.1) or later releases, or a

Cisco 3640 router that is running Cisco IOS Release 12.0(8.1) or later releases, a serial interface

on a Cisco Network Management-8 access server card that is running Block Serial Tunneling

(BSTUN) might not come up after a router reload.

Workaround: Use the shut command followed by the no shut command, or use the clear interface

EXEC command to clear the serial interface.