Specifications

64
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
Caveats
• CSCds21669
If a Cisco 7500/RSP series router is booted with Multilink PPP (MLPPP) running and then
distributed Cisco Express Forwarding (dCEF) switching is enabled after the router comes up,
distributed MLPPP (DMLPPP) does not come up. In this situation, packets will not be distribute
switched. Instead, the switching would be done by the RSP depending on the type of switching that
is configured. There is no workaround.
• CSCds21813
A Cisco 12000 series Gigabit Switch Router (GSR) might experience spurious accesses when
switching IP packets if features like access lists are enabled. There is no workaround.
• CSCds26361
A Cisco 12000 series Gigabit Switch Router (GSR) might access a NULL pointer and experience
a memory fault reload if the router runs out of memory and tries to increase the size of the
Multiprotocol Label Switching Traffic Engineering (MPLS TE) maximum link-state advertisement
(LSA) received. There is no workaround.
• CSCds27045
The atm sonet stm-4 interface configuration command is added to the configuration automatically
when upgrading to Cisco IOS Release 12.0(12)S or 12.0(12.6)S. Removing this line in the
configuration of a Cisco 12000 series Gigabit Switch Router (GSR) results in an error. On a
Cisco 7500/RSP series router, the atm sonet stm-4 command cannot be removed from the
configuration. There is no workaround.
• CSCds27443
Configuring Cisco Express Forwarding (CEF) is configured on a Cisco 7200 series router might
cause a 50 percent packet loss.
Workaround: Clear the Address Resolution Protocol (ARP), or clear the adjacencies.
• CSCds31512
IP option packets may cause Cisco 12000 series Gigabit Switch Router (GSR) line cards to reload
if policy routing is enabled. This situation occurs only when the GSR is running Cisco IOS
Release 12.0(12.x) images. There is no workaround.
• CSCds32139
A Cisco 12008 router that is running Cisco IOS Release 11.2(19)GS4.1 may reload with a bus error.
There is no workaround.
• CSCds34124
In Cisco IOS software that is running Multiprotocol Label Switching (MPLS)/Tag switching over
ATM interfaces, virtual circuit (VC) resource exhaustion at the ATM driver level is not reported to
the MPLS application during Label VC (LVC) creation. This situation causes MPLS to behave as