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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(30)S5
• CSCsd11701
Symptoms: When multicast hardware acceleration is enabled, a wrong label stack may be imposed
on packets that have an IP destination address below 16.x.x.x. This situation occurs, for example,
when the IP destination address is 10.1.1.1 and when the ingress interface is an MPLS VPN VRF
subinterface that is configured for 802.1q. Note that in this situation, the CEF forwarding
information is correct, that is, it has the correct label stack.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with a 3-port GRE
Engine 2 line card but may occur on any Engine 2 line card that has VRF interfaces. The symptom
occurs only when multicast hardware acceleration is enabled.
A list of the affected releases can be found at
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCei01644. Cisco IOS
software releases that are not listed in the “First Fixed-in Version” field at this location are not
affected.
Workaround: There is no workaround.
• CSCsd14677
Symptoms: Link under-utilization may occur on an ATM PVC, and packet drops may occur when
traffic is processed at a lower value than the Peak Cell Rate (PCR).
Conditions: This symptom is observed on a Cisco 10000 series that runs Cisco IOS
Release 12.0(30)S and that is configured with a PRE1 and a 4-port OC3 ATM line card. The line
card is configured for oversubscription factor 50.
Workaround: There is no workaround.
• CSCsd23362
Symptoms: When MLP interfaces on a 1-port channelized OC-12/STM-4 (DS1/E1) ISE line card
are configured for MVPN and you reload the router, the PIM VRF neighbor may not be established
via a tunnel for some MLP interfaces.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(30)S4.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected MLP interfaces.
• CSCsd24601
Symptoms: The FIB becomes disabled when you bring down a member link of an MLP or MFR
bundle.
Conditions: This symptom is observed on a Cisco 7500 series that is configured with an MLP or
MFR bundle and that runs Cisco IOS Release 12.0(30)S, Release 12.0(31)S, or Release 12.0(32)S,
all of which integrate the fix for caveat CSCeg57219. Other Cisco IOS software releases that
integrate the fix for caveat CSCeg57219 are not affected.
Workaround: There is no workaround.
• CSCuk45823
Symptoms: A router may reload when a high load of IP version 6 (IPv6) multicast traffic is being
forwarded. The symptom occurs because of a corrupted redzone in the packet memory.
Conditions: This symptom is observed only on the i82543-based Ethernet family of controllers.
Workaround: Disable IPv6 multicast.
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