Specifications

1069
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S6
• CSCee22454
Symptoms: If a packet comes in through an interface on which RPF is enabled and the RPF check
lookup results in a default prefix which has the Leaf NULL bit set, the packet is dropped even though
the Leaf pointers are valid.
You can see the RPF drops by entering the show hardware pxf interface interface-number detail |
inc RPF command.
Conditions: This symptom is observed when a Cisco 10000 series has two paths in the routing table
installed for the default prefix 0.0.0.0/0 and when the default prefix is a recursive route. This will
cause the Leaf NULL bit to be set. The Leaf NULL bit is only used by the RPF check, hence if a
packet arrives on an RPF-enabled interface and the RPF check lookup results in the default prefix,
the packet is dropped since the Leaf NULL bit is set.
Workaround: Avoid loadsharing, that is, ensure that there is only one path.
• CSCef94525
Symptoms: A port adapter that is installed in a VIP or FlexWAN and that is configured with more
than 38 multilink bundles may crash.
Conditions: This symptom is observed on a Cisco 7500 series and Cisco 7600 series when
distributed CEF switching is disabled either through entering the no ip cef distributed command or
through a FIB-DISABLE event.
Workaround: There is no workaround.
• CSCef98037
Symptoms: Incoming multicast traffic that is forwarded via the main interface of a
Cisco 10000 series is dropped.
Conditions: This symptom is observed on a Cisco 10000 series that has a Gigabit Ethernet main
interface that is configured with a number of VRF-enabled VLAN subinterfaces.
Workaround: Remove the VRFs from the VLAN subinterfaces.
• CSCeg12134
Symptoms: When you send multicast traffic over an IPSec tunnel, a memory leak may occur on a
router.
Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.3T when
both IP CEF and hardware encryption are configured. The symptom may also occur in other
releases.
Workaround: Switch to software encryption for a while and then switch back to hardware
encryption.
Alternate Workaround: Disable IP CEF.
• CSCeh13895
Symptoms: When a 4-port OC-12 ATM ISE line card is deployed in the core between a P router and
a PE router that performs decapsulation in a multicast VPN topology, packets with a size that is
larger than 4447 bytes and that need fragmentation are not received by a CE router.
Conditions: This symptom is observed on a Cisco 12000 series that runs the gsr-p-mz image of
Cisco IOS Release 12.0(28)S2 or a later 12.0S release.
Workaround: There is no workaround.
• CSCeh27783
Symptoms: A router crashes after you have manually configured 237 IPv6 tunnels.