Specifications

130
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(3)
LAT
• CSCdk57205
Printing with LAT/TCP translation might produce an incorrect printout. There is no workaround.
Miscellaneous
• CSCdi72371
When any Cisco 2500 series router is run with asynchronous/synchronous-capable 5-in-1 type
connector low-speed serial ports in asynchronous mode, modem control is only supported when
DTE-style 5-in-1 cables are used (in order to connect to DCE devices). The DCE 5-in-1 cable (in
order to connect to DTE devices) does not support modem control for asynchronous mode.
Workaround: Attach asynchronous DTE devices by using a DTE 5-in-1 cable and a null-modem
adapter.
• CSCdk17210
The Tx count is set to 1 when priority queuing (PQ) or WFQ is configured on the packet over E3/T3
(POET). This 34/44 Mbps interface performs poorly when fancy queueing is configured. There is
no workaround.
• CSCdk27524
When fax relay is used on a Cisco 2600 series router or a Cisco 3600 series router, some fax devices
experience problems while sending large faxes (for example, more than five pages). The common
symptom is that a fax in progress might experience retransmissions or possibly drop the call. This
seems to be more of an issue with fax machines manufactured by Canon. There is no workaround.
• CSCdk28971
A Cisco router cannot handle TCP flows according to the QoS weight defined after a reload or after
using the wr mem or conf mem commands.
• CSCdk35200
When CEF (ip route-cache cef) or DCEF (ip route-cache distributed) switching is enabled, a
Cisco router stops sending ICMP redirects. This condition occurs when operating with
Cisco IOS Release 11.1(20)CC through Release 11.1(21)CC. There is no workaround.
• CSCdk47375
When a Kerberized Telnet is used to communicate between two Cisco routers, the credentials might
not be forwarded. There is no workaround.
• CSCdk55236
Modems that fail during trainup display the disconnect reason as “ATH detected.” Although a call
is successful and is disconnected normally, the modem logs report the disconnect reason as “ATH
detected.” There is no workaround.
• CSCdk59049
When you run TRISL to a Cisco 7000 family router, some frames larger than 1535 bytes might not
be forwarded. This condition occurs when you run TRISL between two VLANs that are on
switches.
Workaround: Do not use TRISL. Use an external device to route or bridge between the two different
VLANs. Or modify the end devices so that they do not send packets larger than 1500 bytes.