Specifications

1134
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S2
• CSCef54779
Symptoms: Under a rare condition, when a main interface switches over to a backup interface on
4-port GE line card, a ping to another neighboring interface that is not at all related to the backup
interface fails. A sniffer trace shows that the Src/Dst MAC address in the ICMP reply is that of the
backup interface.
Conditions: This symptom is observed on a Cisco 12000 series when you repeatedly disable the
main interface that is associated with a backup interface.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface.
• CSCef55373
Symptoms: The BGP process can take up 100 percent of the CPU for an extended period of time
when 6PE is configured.
Conditions: This symptom is observed on a Cisco 12000 series when a large number of IPv6 routes
and 6PE labels are allocated.
Workaround: There is no workaround.
• CSCef56327
Symptoms: You may not be able to configure the clock source line command during the
configuration of the SONET controller on a Cisco 7200 series in which a PA-MC-STM1 port adapter
is installed.
When you enter the clock source line command during the configuration of the SONET controller,
the output of the show running-config command indicates that the clock source is set to line.
However, the output of the show controllers sonet command indicates that the clock is set to
internal, and when you enter the show running-config command again, the output indicates this
time that the clock source is set to internal.
Conditions: This symptom is observed when the PA-MC-STM1 port adapter is connected
back-to-back via dark fiber to another PA-MC-STM1 port adapter.
Workaround: Enter the overhead s1byte ignore command on the SONET controller before you
configure the clock source.
• CSCef59140
Symptoms: The protocol may go down on random link bundles that are part of the multilink Frame
Relay (MFR) protocol on a Cisco 12000 series that is configured with a channelized OC-12 DS1
line card.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(28)S after you have reloaded the router.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected link bundles.
• CSCef62246
Symptoms: An Auto-RP mapping entry may expire when hardware acceleration is enabled on the
VRF interfaces or when a static VRF RP statement is configured on the PE router.
Conditions: This symptom is observed on a Cisco 12000 series that functions as a PE router.
Workaround: Disable hardware acceleration or define a static VRF RP statement with an ACL.
• CSCef64744
Symptoms: On a 6-port channelized T3 line card that is enabled for QoS, a low latency queue (LLQ)
may not receive traffic that is mapped to the LLQ.