Specifications

127
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(3)
• CSCdk63173
When ATM Lite tries to transmit a packet with multiple particles, in some applications such as L2F,
particles after the third in the packet might not be 32-bit aligned. This causes the ATM Lite’s
transmitter to stall. Once this happens, issuing the commands shutdown followed by no shutdown
gets the transmitter out of the stall state until the next such packet arrives.
Workaround: Run L2F in process switching mode.
• CSCdk63201
Multilink PPP disappears from the running configuration if SLIP is invoked. There is no
workaround.
• CSCdk63464
Priority queuing does not work for bridging when you are selecting frame types (access-list).
Bridging traffic is forwarded to the default queue. There is no workaround.
• CSCdk63859
Collisions and late collisions are seen when the Fast Ethernet interface is configured for full-duplex
operation. The PHY was not getting reset after the duplex setting was changed through the
management interface. Thus the interface continues to be in half-duplex mode while the peer is in
full-duplex mode. This results in collisions or late collisions.
• CSCdk66019
Under normal conditions, if no keepalive or keepalive 0 is configured on Fast Ethernet, the line
stays up when the media-independent interface (MII) is removed or the cable is disconnected.
However, if the interface is then reconfigured with keepalive non-zero value while the physical
media stays down, the link still indicates that it is up.
Workaround: Issue the shutdown command followed by the no shutdown command, or issue the
clear interface command.
• CSCdk66320
DECNET multicast packets might fail over VIP2 FDDI port adapters. There is no workaround.
• CSCdk74431
A large packet might be corrupted if it is sent as a multilink PPP (MLP) bundle of two or more links
with VPDN on an ATM PPP tunnel over an ATM-Lite interface.
Workaround: Disable fasts witching on the ATM-Lite interface.
• CSCdk78561
The Token Ring AR/FC bits are not set on the Cisco 2600 and Cisco 7200 series routers. Some PC
applications require that these bits be set; thus, these PCs never connect. There is no workaround.
IP Routing Protocols
• CSCdj87730
When NHRP is running in GRE multipoint tunnel mode, the router might reload if the IP address
of the NBMA is learned from the same GRE tunnel cloud.
Workaround: The workaround is to have the IP address of the NBMA learned from static route, or
have the router learn it from a physical interface.