Specifications

21
Caveats for Cisco IOS Release 12.0
78-6455-12
Wide-Area Networking
• CSCdk53369
Under certain circumstances, a Cisco router will issue the following error message:
"invalid P timer event".
This can happen under certain versions of the code when X.25 switched virtual circuits (SVC) and
a call are switched but not accepted. A call is received and forwarded, the reply is a clear packet
that is returned to the originator. The originator typically sends a “clear confirm” then the message
is not forwarded, leaving the other channel in the “clear-received state” (DCE/P6 or DTE/P7). The
message is emitted some time after this exchange (based on the “call confirm” timeout DCE/T11
or DTE/T21). There is no workaround.
• CSCdk88854
On a Cisco 7200 and 3600 series router, bridging over Frame Relay on a Basic Rate Interface (BRI)
will fail when static mapping is configured for the permanent virtual circuit (PVC).
Workaround: Use routing instead of bridging, or use a point-to-point subinterface.
• CSCdp31542
On the ISDN PRI Switchtype for a 4ESS, primary-4ESS may not be fully compliant with certain
vendor products. There is no workaround.
• CSCdp59816
The X.25 over TCP (XOT) M-bit is ignored or dropped, so that all packets are corrupted. There is
no workaround.
• CSCdp65474
A Route Switch Processor 4 (RSP4) may reload with a bus error and a stack trace because of the
X.25 protocol stack. This situation occurs only if X.25 Over TCP (XOT) is enabled, configured,
and in use. This situation may occur on other platforms. There is no workaround.
• CSCdp68193
When entering the show tcp EXEC command, a Cisco router that has a high X.25 protocol
translation load may reload. There is no workaround.
• CSCdp97152
When running Cisco IOS Release 12.0 with User-Network Interface (UNI) 3.0, a Cisco
LightStream 1010 and a Cisco Catalyst 8540 MSR may fail to send poll protocol data units (PDUs)
periodically. This situation may result in a
no_response_timer expiry
message and flapping of the Service-Specific Connection-Oriented Protocol (SSCOP) link.
Workaround: Configure UNI 3.1 on the link.
• CSCdr15509
A Cisco 3640 router may run out of small buffers in seven days with packets similar to the
following packet:
Buffer information for Small buffer at 0x60CAEF24 data_area 0x19D0C04, refcount 1, next
0x0, flags 0x400200 linktype 55 (SRB), enctype 20 (FRAME-RELAY), encsize 34, rxtype 0
if_input 0x60C0DD9C (Serial1/0), if_output 0x0 (None) inputtime 0x131FA530, outputtime
0x0, oqnumber 65535 datagramstart 0x19D0C40, datagramsize 54, maximum size 260 mac_start
0x19D0C40, addr_start 0x19D0C42, info_start 0x19D0C58 network_start 0x19D0C58,
transport_start 0x19CA266 =20 =20 019D0C00: AFACEFAD 00000000 00010001 00000000
/,o-............ 019D0C10: 00000000 60B6225C 00000000 00000000 .....6"........
019D0C20: 00000000 00000000 00000000 00000000 ................ 019D0C30: 01000C00
10000411 03008000 80C20009 .............B.. 019D0C40: 00400040 5DC028E9 AA000400
C918AAAA .@.@]@(i*...I.** 019D0C50: 03000000 08060006 08000604 0001AA00