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946
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(30)S1
Conditions: This symptom is observed on a Cisco 12000 series that runs a Cisco IOS interim release
for Release 12.0(30)S and that is configured for Fast ReRoute.
Workaround: There is no workaround.
CSCef25917
Symptoms: A 4GE-SFP-LC line card may reload unexpectedly when it processes QoS traffic in a
configuration with a VLAN on a VCG that is configured with an ingress CoS.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(26)S or a later release when the resolved ARPs are deleted, for example, when routers
flap, when BGP peers do not respond, or when you enter the clear arp command. Note that the
symptom may also occur on releases earlier than Release 12.0(26)S.
The ingress CoS includes a set command for the matched class: either a police command with a set
command or a simple set command and either a set-mpls command or a set-dscp command.
Possible Workaround: Configure static ARPs.
CSCef26543
Symptoms: A Cisco 12000 series line card may rate-limit process-switched packets to the GRP. This
situation causes a ping to be lost when you perform a ping test to the local interface of the router.
Conditions: This symptom is observed when the interface is configured for HDLC, when the
interface has a hard loop, and when the IP address of the interface is the destination of the ping.
Because the interface is in the up/up state (looped) and functional, there should be no packet loss
when you ping the interface at its own IP address.
Workaround: There is no workaround.
CSCef30689
Symptoms: The AToM label holddown period is too short, and AToM traffic may be misdirected.
Conditions: AToM holds down its VC labels for 20 seconds before it releases them to the label
manager. These labels are then available for allocation to other protocols or features such as LDP,
TE, and MPLS VPNs. However, 20 seconds is not sufficient to guarantee that the AToM peer has
properly deleted the entries and may cause AToM VC traffic to be misdirected by the protocol or
features to which the freed AToM label is allocated.
Workaround: There is no workaround.
CSCef35911
Symptoms: MPLS IAS traffic without labels is dropped at one ASBR when PPP encapsulation is
configured between two ASBRs.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(28)S1 and that functions as an ASBR. However, the symptom may be
platform-independent and may also occur in other releases.
Workaround: Change the encapsulation to HDLC.
CSCef43691
A document that describes how the Internet Control Message Protocol (ICMP) could be used to
perform a number of Denial of Service (DoS) attacks against the Transmission Control Protocol
(TCP) has been made publicly available. This document has been published through the Internet
Engineering Task Force (IETF) Internet Draft process, and is entitled “ICMP Attacks Against TCP”
(draft-gont-tcpm-icmp-attacks-03.txt).
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