Specifications

4
Caveats for Cisco IOS Release 12.0
78-6455-12
Basic System Services
• CSCdp32560
A Cisco router that is running Cisco IOS Release 12.0(5.5) with a Route Switch Processor (RSP)
may see “output stuck” messages followed by a “CBus complex restart” message that clears the
problem. There is no workaround.
• CSCdp59691
A Cisco AS5800 series universal access server, a Cisco 7200 series router, a Cisco uBR7200
universal broadband router, or a Cisco 6400 series router may experience a memory leak. If an IP
packet needs fragmentation in the fast-switching path and the packet has additional bytes of data
tagged on beyond the length indicated in the IP header, there might be a leak in the I/O memory of
the system. The memory leak will depend on the size of the original unfragmented packet and on
the size of the extraneous data.
Workaround: Disable fragmentation in the fast-switching path by using the service
disable-ip-fast-frag global configuration command.
• CSCdr17966
When the aaa new-model global configuration command is not present in the startup configuration
mode, command authorization fails because the authentication, authorization, and accounting
(AAA) software cannot find a username.
Workaround: Enter the aaa new-model global configuration command in the startup configuration.
• CSCdr22407
Frame Relay (FRF.9) hardware compression does not keep input byte count for compressed data on
both interface level and Frame Relay permanent virtual circuit (PVC) level. The display from these
commands appears inconsistent with the output byte counts and with the FRF.9 software
compression statistics displayed by the show interface, show compress, and show frame-relay
pvc EXEC commands. Also, the corresponding MIB representation becomes inconsistent. There is
no workaround.
• CSCdr28133
After an upgrade from Cisco IOS Release12.01XA3 to Cisco IOS Release 12.0(7)T, a StrataCom
backbone with UXM trunk cards needs two ATM cells instead of one for the fax frame size, thereby
taking 25% more bandwidth. There is no workaround.
• CSCdr31580
Memory leaks in a Cisco router that is running Cisco IOS Release 12.0(10)S and that is running a
high number of ISDN data calls using Multilink PPP will eventually result in a system reload or
degradation when memory is depleted.
The processes in the show process memory EXEC command that continue to consume large
amounts of memory are Multilink Event, PPP Manager, PPP Auth, and ISDN. There is no
workaround.
• CSCdr47327
When the compression service adapter (CSA) for a Cisco 7200 series router is configured with PPP
encapsulation, it loses compression from the configuration upon router reload.
Workaround: Reenable the compress stac interface configuration command after reload.
• CSCdr55787
SA-ENCRYPT does not work if configured with fast switching or Cisco Express Forwarding (CEF)
on a Cisco 7200 series router with hardware encryption (Cisco Encryption Technology).
Workaround: Configure as process switching.