Specifications

1315
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S3
Conditions: This symptom is observed on a Cisco 10720 that runs Cisco IOS Release 12.0(26)S or
a later Cisco IOS Release 12.0 S release, all of which contain IPv6 PXF packet forwarding
functionality, and is most likely to occur while IPv6 packets are passing through the router.
Workaround: Disable IPv6 functionality or disable PXF by entering the no service pxf command.
• CSCee78118
Symptoms: A line card or port adapter may crash on an MPLS VPN PE router when the
customer-facing interfaces are flapped.
Conditions: This symptom is observed when any of the following conditions are present:
– eBGP is used as the routing protocol between the PE and CE router, the CE router has the
redistribute connected command enabled in the BGP configuration, and there are multiple
eBGP sessions between the PE and CE router.
– The connected route for the link between the CE and PE router is learned from another PE router
via MP-iBGP. For example, the CE router may be dual-homed and may advertise the connected
routes to both PE routers.
The symptom affects routers that perform MPLS forwarding using ASICs such as some
Cisco 7200 series routers, the Cisco 7304, the Cisco 10000 series, the Cisco 12000 series, and the
Cisco RPM-XF. (This list may not be exhaustive.)
Workaround: Avoid the above-mentioned conditions. For example, avoid the redistribute
connected command in the BGP configuration of the CE router.
• CSCee78567
Symptoms: A temporary counter condition in which you see very large MPLS TE tunnel counter
spikes may occur on a Cisco 12000 series. This situation is observed via the SNMP variable
IfHCOutOctets (the total number of octets transmitted), via the SNMP variable locIfOutBitsSec (the
Cisco 5-minute decaying average), and in the output of the show interfaces tunnel number
privileged EXEC command (observe the elevated output rate).
Conditions: This temporary counter condition is observed only for one or two sample periods and
affects the MPLS-TE auto-bandwidth mechanism because the collection timer may be invoked at a
time while the counter is at an extreme value. If the auto-bandwidth mechanism collection value is
greater than the physical interface capability, the LSP tunnel build fails at the next LSP tunnel build.
Workaround: There is no workaround.
• CSCee80041
Symptoms: A line card with an ATM QoS configuration may crash.
Conditions: This symptom is observed on a Cisco 12406 that runs a Cisco IOS interim release of
Release 12.0(29)S. However, this caveat is resolved in Release 12.0(29)S.
Workaround: There is no workaround.
• CSCee80214
Symptoms: When you delete shaping by entering the no shape cir command, shaping seems to be
disabled on all interfaces, which can be seen in the output of the show policy-map interface
interface-name command. However, the output of the show policy-map policy-map command still
shows the shape value.
Conditions: This symptom is observed on Frame Relay subinterfaces on a Cisco 10000 series.
Workaround: Remove and reconfigure the Frame Relay class on each subinterface or remove the
policy map from the map class and reconfigure the policy map.