Specifications

1371
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S
Workaround: There is no workaround.
• CSCeb85136
Symptoms: An IP packet that is sent with an invalid IP checksum may not be dropped.
Conditions: This symptom is observed if the IP checksum is calculated with a decreased time-to-live
(TTL) value. For example, in the situation where the IP checksum must be 0x1134 with a TTL of 3,
if the packet is sent with an IP checksum of 0x1234 that is calculated by using a TTL value of 2, the
packet is not dropped. In all other cases, packets with incorrect checksums are dropped.
Workaround: There is no workaround.
• CSCeb86563
Symptoms: Multicast forwarding entries on a line card may become incorrect, causing packets to be
forwarded to the Route Processor (RP). Packets may be dropped from the line card when the
outgoing list becomes empty.
Conditions: This symptom is observed after a high availability (HA) switchover has occurred.
Workaround: Reload the line card after the HA switchover has occurred.
• CSCec06466
Symptoms: A Cisco router may reload unexpectedly when the Designated Forwarder (DF) interface
is changed to an interface that is already in the Outgoing Interface list (O-list).
Conditions: This symptom is observed on a Cisco router that is configured for multicast
Bidirectional PIM (Bidir-PIM).
Workaround: There is no workaround.
• CSCec10494
Symptoms: A Cisco router or switch may reload unexpectedly when you enter the show ip igmp
tracking detail EXEC command.
Conditions: This symptom is observed when the ip igmp explicit-tracking interface configuration
command is enabled and the entries in the cache have expired.
Workaround: There is no workaround.
• CSCec13278
Symptoms: A Cisco router may generate continual tracebacks when you perform an online insertion
and removal (OIR) of a line card.
Conditions: This symptom is observed when Internet Group Management Protocol (IGMP) and IP
Protocol Independent Multicast (PIM) are enabled.
Workaround: Before you perform the OIR, disable IP PIM.
• CSCec15095
Symptoms: A network link-state advertisement (LSA) may not be originated for an interface.
Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0 S,
Release 12.2 S, Release 12.3, or Release 12.3 T when an interface that is configured for Open
Shortest Path First (OSPF) and that is up has the same address as another interface that is shut down.
Workaround: There is no workaround.
• CSCec16481
A Cisco device running Internetwork Operating System (IOS) and enabled for the Open Shortest
Path First (OSPF) Protocol is vulnerable to a Denial of Service (DoS) attack from a malformed
OSPF packet. The OSPF protocol is not enabled by default.