Specifications

1176
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S1
– The router functions as a PE router with the Engine 4+ POS line card facing the core and
performing MPLS disposition.
– VRFs are configured on the router.
– The Explicit Null feature is enabled on the router.
Workaround: There is no workaround.
• CSCee58770
Symptoms: A Cisco router may generate the following error message:
%TUN-5-RECURDOWN: Tunnel2 temporarily disabled due to recursive routing
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(26)S2 and that is configured with a tunnel services card (TSC) (that is, a 1-port OC-48
POS line card) when MPLS TE tunnels are configured on the router and when static routes are
added.
Workaround: There is no workaround.
• CSCee59106
Symptoms: The performance of an OC-48 to E3 concatenated or channelized line card may drop
from 4 Mpps to 2.84 Mpps when oCAR is enabled in a configuration that includes both the
conform-action and exceed-action keywords and when oCAR is transmitting packets and changing
the precedence.
Conditions: This symptom is observed on a Cisco 12000 series that runs the c12kprp-p-mz image of
Cisco IOS Release 12.0(28)S or an earlier release. However, note that performance drops do not
occur in Release 12.0(27)S1.
Workaround: There is no workaround.
• CSCee59585
Symptoms: On a Cisco router, the output of the execute-on slot number show ip cef prefix command
may display the same imposed label twice for a recursive public route.
Conditions: This symptom is observed on a Cisco platform that supports distributed forwarding such
as a Cisco 7500 series or a Cisco 12000 series when the neighbor name send-label command is
configured under an IPv4 BGP address family on a VIP or line card and when one of the following
actions occurs:
– You enter the clear cef linecard command.
– You perform an OIR of the VIP or line card.
– You enter the no ip cef distributed command followed by the ip cef distributed command.
The symptom disappears after the affected prefix flaps.
Workaround: There is no non-impacting workaround, but you can enter the clear ip route prefix
command or reset the BGP peer to solve the problem.
• CSCee63939
Symptoms: An Engine 6 line card may crash during the MDFS process.
Conditions: This symptom is observed on a Cisco 12000 series when multicast and unicast traffic
are running through the Engine 6 line card.
Workaround: There is no workaround.