Specifications

1231
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S
Conditions: This symptom is observed on a Cisco 10720 router running Cisco IOS
Release 12.0(26)S or a later release.
Workaround: There is no workaround.
• CSCed57841
Symptoms: When the error message “Info: Illegal normal burst size, increased to mtu size 4470” is
generated on a channelized STM-1 MM PA, the VIP in which this PA is installed and the RSP may
crash.
Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS
Release 12.0(26)S1 when MQC is configured on the channelized STM-1 MM PA.
Workaround: There is no workaround.
• CSCed59020
Symptoms: An Engine 1 single port Gigabit Ethernet line card for a Cisco 12000 series router may
reload unexpectedly on receipt of large amounts of “pause input” frames sent via flow control from
a downstream device.
Conditions: This symptom will occur only if the Gigabit Ethernet line card is forwarding large
amounts of traffic to an overwhelmed downstream device that in turn sends “PAUSE” (XOFF)
frames to the line card.
Workaround: Disable flow control on the downstream device.
• CSCed60690
Symptoms: Engine 4+ loadsharing does not work correctly for in a VPN imposition situation. The
problem is not seen with Engines 0, 2 and 3.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(27)S when traffic enters on a VRF interface and is loadshared over four links to the
core. Traffic is loadshared over only two of the four links.
Workaround: Use three-path loadbalancing.
• CSCed60987
Symptoms: On a Cisco 7500 series with distributed CEF, connectivity between CE routers that are
locally connected to the same interface may be broken.
Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS
Release 12.0(26)S or a later release when an output service policy is configured on the subinterface
of one CE router but not on the subinterface of the other CE router. Traffic that is process-switched
flows correctly between the CEs routers.
Workaround: Configure a dummy output service policy on the subinterface that does not have an
output service policy.
• CSCed61577
Symptoms: After executing a forced switchover, the secondary processor returns only to COLD
standby and not HOT standby.
Conditions: This symptom is observed on a c10k-p10-mz image on a Cisco 10000 series router.
Workaround: There is no workaround.
• CSCed61818
Symptoms: Traffic forwarding stops when an egress CAR is configured on an Engine 0 interface.