Specifications

82
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(6)
• CSCdm19457
A Cisco 7500 router with a VIP or ESA-PA port adapter suffers from buffer starvation because of
incorrect MEMD reservation. This problem is observed in Cisco IOS Release 11.2(7)P crypto
images.
RSPs with an ESA-PA allocate a MEMD buffer pool of size 32 bytes, which would never be used.
This also leads to a reduced number of buffer headers available to other interfaces in the system.
This leads to packet drops on other interfaces, even with moderate traffic load because of buffer
starvation. For example, a router reserving an unused buffer pool would produce the following
output:
Router#show cont cbus MEMD at 40000000, 2097152 bytes (unused 612096, recarves 1, lost
0) RawQ 48000100, ReturnQ 48000108, EventQ 48000110 BufhdrQ 48000130 (9 items), LovltrQ
48000150 (16 items, 2016 bytes) IpcbufQ 48000160 (24 items, 4096 bytes) IpcbufQ_classic
48000158 (8 items, 4096 bytes) 3570 buffer headers (48002000 - 4800FF10) pool0: 3206
buffers, 32 bytes, queue 48000138 <======= Unused buffers pool1: 8 buffers, 256 bytes,
queue 48000140 pool2: 217 buffers, 1536 bytes, queue 48000148 pool3: 78 buffers, 4512
bytes, queue 48000168 pool4: 4 buffers, 4544 bytes, queue 48000170 slot1: VIP2, hw 2.4,
sw 22.20, ccb 5800FF30, cmdq 48000088, vps 8192 software loaded from system
Workaround: Remove the ESA-PA port adapter, if not used. Or, Upgrade your Cisco IOS software
to Release 11.2(19)P, Release 11.2(19.01)P, Release 12.0(5.2), Release 12.0(5.2)PI06, or
Release 12.0(5.5)T.
• CSCdm22032
If you configure PPP encapsulation on an interface and then make that interface a member of a
bridge group, the following messages will result:
00:06:39: -Traceback= 601C9C58 602015E0 60556558 60553958 6021D034 6021D020 00:06:39:
Fair Queue:packet not initialized properly: 0, 0 , 38 00:06:39: -Traceback= 601C9C58
602015E0 60556558 60553958 6021D034 6021D020 00:06:39: Fair Queue:packet not
initialized properly: 0, 0 , 38 00:06:39: -Traceback= 601C9C58 602015E0 60556558
60553958 6021D034 6021D020 00:06:40: Fair Queue:packet not initialized properly: 0, 0
, 38 00:06:40: -Traceback= 601C9C58 602015E0 60556558 60553958 6021D034 6021D020
00:06:40: Fair Queue:packet not initialized properly: 0,0,3800:06:40: -Traceback=
601C9C58 602015E0 60556558 60553958 6021D034 6021D020 00:06:40: Fair Queue:packet not
initialized properly: 0, 0 , 38 00:06:40: -Traceback= 601C9C58 602015E0 60556558
60553958 6021D034 6021D020 00:06:40: Fair Queue:packet not initialized properly: 0, 0
, 38 00:06:40: -Traceback= 601C9C58 602015E0 60556558 60553958 6021D034 6021D020
00:06:40: Fair Queue:packet not initialized properly: 0,0,3800:06:40: -Traceback=
601C9C58 602015E0 60556558 60553958 6021D034 6021D020
Workaround: Remove bridging from the interface or turn off fair queueing.
• CSCdm28631
If an encryption service adapter (ESA) is bringing up a large number of crypto sessions
simultaneously (under conditions of stress), it might enter a race condition, or get a crypto initiation
message wedged in the input queue of the interface processing the encryption. There is no
workaround.
• CSCdm33429
A Cisco AS5300 access server might experience a bus error under heavy loads that are caused by
outgoing modem calls. There is no workaround.
• CSCdm34081
An “ALIGN-1-FATAL” error is observed when the copy tftp start command is enabled while a
configuration is loaded into NVRAM. There is no workaround.