Specifications

150
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(2)
• CSCdk40947
When the link(s) between redundant ATM ARP servers breaks, then the ARP servers keep trying
to contact each other to repopulate the ARP cache.
Due to excessive signalling the CPU load on the routers and ATM switches can rapidly reach 99%.
The workaround is to use only one ARP server or to put them on very stable links.
• CSCdk41708
There is a limitation of 25 encryption maps on an any VIP. This limit is likely to be reached when
encrypting many serial lines on the VIP using a fractional T1 or E1 port adaptor.
• CSCdk41735
When the traffic between the PA-12E/2FE port adapter and the CPU is high and the PCI bus is
overloaded, a DEC21140 can get “underrun” and “overrun” errors. This is due to PCI congestion.
The traffic is affected momentarily, then restored.
• CSCdk42816
An Ethernet interface running Tag Switching and CEF might get into a state where the IP packets
are not forwarded properly. The problem occurs when a CEF entry is improperly pointing at a Tag
data structure. To check whether this is the problem, issue the command show adjacency detail for
the next hop on the failing route. In the failure case, the packet counts on the IP adjacency will not
be increasing, but those on the TAG adjacency will.
Workaround: Disable Tag Switching on the interface.
• CSCdk42845
On run-from-Flash systems, issuing the command copy flash tftp incorrectly invokes the Flash
load helper code.
• CSCdk42920
In some situations, FTP file transfers would fail due to an internal error.
• CSCdk43602
Bell 103 communication does not work on the analog Microcom modems in answer mode.
• CSCdk44137
The Explorer bit, in the TRISL header, might be incorrectly set for Non-Specific Routed (NSR)
frames. Normally, the Catalyst 5000 and 3900 ignore this bit for NSR, but sometimes it causes
some problems. Specifically, IP pings for NSR frames fail at times.
• CSCdk46346
If an encryption map is applied to a dialer interface, dialer pools are used, and a dial-up interface
(for example, BRI) is used as the physical interface, then when that dial-up interface is unbound
from the dialer it might cause a system reload or misalignment. A workaround is to not use dialer
pools.
• CSCdk46537
The length field in the MAC Management Message Header for the SYNC message is computed
incorrectly. A workaround is to use a modem that has the Broadcom chipset. Because the SYNC
message is a well known size, the Broadcom chipset can read the CMTS timestamp without looking
at the length field.