Specifications

80
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(6)
• CSCdm40466
You might lose connectivity on Inter-Switch Link (ISL) trunk subinterfaces if you configure a
bridge group on one of the subinterfaces and then reboot the router. This is a Route Switch
Processor (RSP)-specific issue and the problem is not seen on other platforms. Removing the bridge
group does not resolve the problem.
Workaround: Reboot the router after removing all the bridging and Bridge-Group Virtual Interface
(BVI) statements.
• CSCdm40975
Under certain conditions, a Cisco 7200 series router corrupts IP packets when using certain types
of switching (for example, fast switching or Cisco Express Forwarding [CEF]) from an
Asynchronous Transfer Mode (ATM) permanent virtual circuit (PVC) using bridging encapsulation
and a Bridge-Group Virtual Interface (BVI). This condition only occurs if the sending bridge
preserves the original cyclic redundancy check (CRC) in the packet.
Workaround: Disable the appropriate type of switching.
• CSCdm41644
A Cisco router running Cisco IOS Release 12.0 T might reload due to an overwrite issue in the BSS
area when FDDI modules are used. There is no workaround.
• CSCdm46735
A PA-4R-DTR port adapter might reset under the following circumstances:
– A high rate of traffic is traversing the port (200 pps or greater).
– The PA-4R-DTR port adapter is the active monitor of the physical Token Ring
– An event on the ring occurs that forces the active monitor to purge the Token Ring
When this problem occurs, the PA-4R-DTR port adapter resets, and the ring experiences a beacon.
Workaround: Make sure the DTR port is not the active monitor on the Token Ring. This can be done
by ensuring that the MAC address of the DTR card is not the highest MAC address on the physical
Token Ring.
• CSCdm60960
With the following input-type-list, a Cisco router does not respond to an Address Resolution
Protocol (ARP) request.
interface Ethernet0/0 ip address 10.10.13.1 255.255.255.0 standby 143 priority 110
preempt standby 143 ip 10.10.13.254 bridge-group 1 bridge-group 1 input-type-list 201 !
The router responds without it, and also responds if you add the line for ARP packets. You can ping
the interface IP address but not the HSRP address.
Workaround: Delete the input access lists on the bridge interface, or permit type 0x0806 in the
access list.
IP Routing Protocols
• CSCdk83299
The lane client command resets the address resolution protocol (ARP) timeout to the default value
(four hours). After the lane client command is entered, any desired configuration of ARP timeout
needs to be reentered, including immediately after reboot. There is no workaround.
• CSCdm44957
Some IP fragments might be incorrectly filtered out by access lists. There is no workaround.