Specifications

1391
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S
Conditions: This symptom may be observed in situations where three or more routers have
advertised the same IP address in LDP address messages. This normally happens when routers have
been misconfigured but in very rare circumstances may be done deliberately.
The circumstance can be recognized by the presence of the following error message:
%TAGCON-3-DUP_ADDR_RCVD: Duplicate Address 10.0.0.1 advertised by peer 10.2.2.2:0 is
already bound to 10.1.1.1:0
If only one such message is seen for a given IP address (10.0.0.1 in the above example) then only
two routers have advertised the IP address, and only the second is being treated as a duplicate. At
least one more such message should be seen if at least three routers have advertised the IP address
in question.
Workaround: The symptom does not occur in typical configurations because duplicate addresses are
not configured. If such a configuration is accidentally done, the failure may be avoided if the
configuration is corrected before the LDP session to any of the involved peers goes down. If the
configuration is deliberate, there is no workaround.
• CSCeb87159
Symptoms: The CNS event agent does not detect when the connection to the server breaks.
Conditions: This symptom is observed when the CNS event agent service is configured by the cns
event keepalive configuration command.
Workaround: There is no workaround.
• CSCeb87444
Symptoms: IP packets may be dropped from an input EtherChannel interface when Cisco Discovery
Protocol (CDP) is enabled.
Conditions: This symptom is observed on a Cisco 10720 when EtherChannel and CDP are enabled
on every interface in the router.
Workaround: Disable CDP on the interfaces that are part of the EtherChannel channel group.
• CSCec00268
Symptoms: A multilink interface may stop processing received packets.
Conditions: This symptom is observed on a Cisco 7500 series when Multilink PPP (MLP) is
configured and when a lot of traffic is forwarded to the process-switching path.
Workaround: To clear the symptom, move the physical interfaces to a new multilink interface with
a new interface number.
• CSCec00370
Symptoms: An Internet Control Message Protocol version 6 (ICMPv6) checksum error may be
generated, causing a ping to fail.
Conditions: This symptom is observed on a Cisco 10720 when an IP version 6 (IPv6) ping of
291 bytes or more is performed on a Gigabit Ethernet interface, or when an IPv6 ping of 305 bytes
or more is performed on a Fast Ethernet interface.
Workaround: There is no workaround.
• CSCec02911
Symptoms: Normal priority IP packets do not exit the queue fast enough on a Cisco router during a
heavy load period. The router is unmanageable, and pings and Telnet sessions fail. All PPP over
ATM (PPPoA) and Layer 2 Tunneling Protocol (L2TP) tunnels are lost. This symptom may be
observed by reviewing the output of the show ip spd EXEC command.