Specifications

1222
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S
Workaround: Avoid renaming the policy-map.
• CSCed37749
Symptoms: Any Transport over Multiprotocol Label Switching (AToM) virtual circuits (VCs) may
fail to come up.
Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.2 S and that
is configured for AToM and Cisco Express Forwarding (CEF). The symptom may also occur in
Release 12.0 S.
Workaround: Toggle the CEF configuration; that is, remove CEF and reconfigure CEF.
• CSCed39059
Symptoms: The tag forwarding table for a line card on Cisco platforms that have distributed (i.e.
linecard based) forwarding, such as the Cisco 7500 Series and the Cisco 12000 Series, may not have
complete entries even though the Route Processor (RP) does. This results in ingress tagged traffic
being dropped for the missing tag forwarding entries.
Conditions: This symptom is observed on Cisco platforms that have distributed (i.e. linecard based)
forwarding in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN)
environment with a provider edge (PE) router to customer edge (CE) router link.
The problem is more likely to happen if the PE to CE link experiences quick flaps of an interface
(i.e. goes down and come back up in a very small amount of time (e.g. 2 sec)). Although this can
happen on any linecard, this situation is more likely to happen on the Engine 3 (E3) channelized
OC-48 line cards due to its quick flapping behavior.
Note: There are additional prerequisites for this bug to happen. These are:
– The defect affects routers that are: (a) MPLS VPN PE routers or (b) routers that exchange labels
for ipv4 BGP routes.
– For (a) there should be recursive routes on the PE that go over the PE-CE link (this could be
either BGP learnt recursive routes or static recursive routes). Also, these recursive routes have
the link’s CE side ip address as their nexthop.
– There should be a less specific route to get to the nexthop (this can be a default route). This
applies for (a) and (b).
Workaround: There is no workaround.
• CSCed39106
Symptoms: Removal of the primary CSC from a Cisco 12816 router (when all 5 fabric cards are
present in the router), stalls the active RP for about 10 minutes and brings down standby RP to
ROMMON prompt.
Conditions: This symptom is observed on a Cisco 12816 router.
Workaround: Do not do an OIR of the primary CSC.
• CSCed40547
Symptoms: A Cisco 7500 router may reload when dMLFR interface(s) is/are configured.
Conditions: This problem can occur only when distributed CEF switching is disabled globally on
the router. The following command can cause this issue to occur:
Router(config)# no ip cef distributed
Workaround: Do not disable distributed CEF switching on the router, as dMLFR works only when
distributed CEF switching is enabled.