Specifications

113
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(4)
• CSCdk64629
NAT only translates the first address entry in a NetBIOS Name Service (NBNS) group name
response message. Other group name address entries are not translated, and therefore the NetBIOS
client is only able to reach the first group address host. This happens because the client would be
using an inside local address from the outside for the other members of the NBNS group name.
There is no workaround.
• CSCdk74808
When IP unicast RPF check is enabled on one subinterface, all the subinterfaces on that interface
have the check performed. This includes subinterfaces that were deleted. This situation might cause
the router to drop packets that do not pass the reverse-path test. Note that this might only be an issue
for asymmetric routes.
Workaround: Disable the IP unicast RPF check on the subinterface that has it enabled. If this
subinterface has already been deleted, it must be configured again and the RPF check must be
disabled. The subinterface might be deleted again after this is done.
• CSCdk78845
When the prune-timers in the oil list are not identical, the mroute will still go to a “forwarding”
status even when there is no listener. There is no workaround.
• CSCdk81888
OSPF might reload if a corrupt protocol packet is received and the corruption is not detected by the
IP checksum. Because the IP checksum detects most packet corruptions, a reload is highly unlikely
unless a large percentage of OSPF packets are corrupt.
Workaround: Fix the source of the packet corruption, or shut down the link on which the incoming
packets are received.
• CSCdk82872
After a file with a large filename is transferred, Cisco IOS Network Address Translation (NAT) does
not translate the embedded IP address in the ftp port command.
Workaround: Close the FTP session and open a new one.
• CSCdk87469
OSPF External type-1 routes that are added to the routing table are not removed once that route is
gone. This is seen in Cisco 7000 series routers running Cisco IOS Release 12.0(2)S as well as Cisco
AS5200 access servers running Cisco IOS Release 12.0(2)T.
Workaround: Clear the routing table or redistribute external routes as type-2.
• CSCdk83829
If the physical memory of a system is completely exhausted with huge number of routes and peers,
a Cisco router might reload. There is no workaround.
• CSCdm05440
Selective Packet Discard (SPD) can erroneously discard “hello” packets from some routing
protocols, such as OSPF, EIGRP, and HSRP. When a router is processing many other packets at
process level, the lost routing protocol packets can cause route and HSRP “flapping,” leading to
intermittent data packet loss. There is no workaround.