Specifications

141
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(2)
heavy traffic between the peers using the DLSw pipe, and a packet coming from the peer is 1 to 3
bytes in excess of the MSS (Maximum Segment Size) of the receiver. Under these conditions, the
receiving TCP device does not give the assembled packet to DLSw, until another packet arrives.
Workaround: Adjust the MAXDATA (MAX PIU) of the end node to the value of MSS-16 bytes
(allowing 16 bytes for the DLSw header) in the case of SNA.
• CSCdk37560
A Token Ring LEC configured for HSRP and multiring IP might respond to IP RIF packets received
from the BUS, even though it is not the intended recipient for such packets. This happens when IP
packets with a RIF are sourced by other LECs on a Token Ring ELAN and targeted at remote
devices which are one or more SRB hops away from the ELAN. The LEC fails to filter these
packets, thereby causing IP looping problems in Token Ring LANE environments. This problem
occurs on the Cisco 4700, Cisco 7200, Cisco 7500, and Cisco RSP7000 platforms.
• CSCdk39734
APPN auto-activate on demand works only once in Cisco IOS Release 11.2 and does not function
at all in Cisco IOS Release 11.3. There is no workaround.
• CSCdk41016
The router fails when BSC receives a frame through BSTUN while it is in the process of
transmitting a frame on the BSC line.
• CSCdk41218
When Bisync is running on a branch router connected to an NCR5085 cash machine, if a corrupted
acknowledgment is received from the ATM XA machine, under unusual conditions you might see
the input queue on the serial interface connected to the ATM machine get into a wedged state. If
the serial interface is in this state, issuing the show interface command displays the value of input
queue as 75/75.
Workaround: Shut down the interface and bring it back up by issuing the command shutdown
followed by no shutdown. An additional workaround is to schedule the shutdown/no shutdown
by increasing the interface input hold queue size by issuing the command hold-queue 150 in under
the bisync interface.
• CSCdk46217
A Cisco 2600 series router running Cisco IOS Release 11.3(5)T and later, configured for
BSTUN/Frame Relay, might lose a portion of the Frame Relay configuration and the encapsulation
might change from Frame Relay to BSTUN. (You can see that the configuration has changed by
issuing the show interface command.) This causes the Frame Relay link to go down when the
router is reloaded. There is no workaround.
• CSCdk48387
A Cisco 4500 router configured with a Token Ring LE Client adds 6 extra bytes when fast switching
routed protocol packets from a Token Ring LEC ATM interface to the packets’ target (output)
interface. Although this problem is known to occur with IP packets, it potentially exists for other
routed protocols that are fast switched in from a Token Ring LANE interface and fast switched out
to the packets’ target interface.