Specifications

121
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(4)
• CSCdk85274
When attempting to bring up more than just a few tunnels with Virtual Private Dial-Up Networking
(VPDN), CPU utilization rises to nearly 100%. If a single tunnel is used, no performance
degradation is noticed. There is no workaround.
• CSCdk86557
When running PPP in conjunction with NFAS on PRIs the NFAS interfaces that are configured to
have 24 B-channels will only be able to negotiate and pass PPP data on the first 23 channels. Calls
will be routed to the 24th B-channel but the router is unable to send PPP data out it and thus that
user is stuck until PPP times out and they dial in again and get another B-channel.
Workaround: Take the 24th channel out of service with the
isdn service dsl x b_channel 24 state 2 command.
• CSCdk87834
On an RSP, L2F Protocol fails to forward fast-switched packets from the tunnel to some physical
interfaces (such as PRIs). The L2F neither punts the packets to process nor does it free the packets
up. L2F related applications like SGBP and VPDN are affected. There is no workaround.
• CSCdk88413
When the random-detect command is configured, a Cisco router can reload at ISDN call setup.
There is no workaround.
• CSCdk92934
When you enable both Multichassis Multilink PPP commands (sgbp group and sgbp member) and
vpdn authen-before-forward on a NAS at the same time, Multilink dial-in users are not able to
establish connections.
Workaround: Turn off sgbp or vpdn authen-before-forward.
• CSCdk94188
In certain circumstances, you must set the extend bit in the channel ID when communicating with
a Northern Telecom DMS-100 Custom switch. There is no workaround.
• CSCdm00889
ARAP Callback is negotiated with iMAC dialing in, but is not executed in the Cisco IOS software.
There is no workaround.
• CSCdm01059
Systems can generate bad memory accesses and possibly reload when IPCP completes negotiations
on PPP links. This problem was inadvertently introduced with the patches for defect CSCdk13366.
Workaround: Customers using PPP that have system images into which CSCdk13366 has been
incorporated will need to upgrade to use an image that includes CSCdm01059.
• CSCdm01117
When using the backup load command, a software-forced reload might occur when the load
threshold is reached. There is no workaround.