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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(31)S3
CSCei95220
Symptoms: When an APS switchover occurs on 1-port channelized ISE line cards, traffic may not
recover although the controllers may be in up state. The interfaces may remain indefinitely in the
up/down state.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(31)S or an earlier release when a significant amount of traffic is being processed when
the APS switchover occurs.
Workaround: There is no workaround. However, the built-in failure detection mechanism detects
that the ingress data path is locked up and automatically resets the PLIM of the affected line card.
CSCej01615
Symptoms: On a router that is configured for Multiprotocol Label Switching (MPLS) Label
Distribution Protocol (LDP), the CPU usage may increase considerably for an extended period of
time when a large number of label bindings are withdrawn or released at the same time.
Conditions: This symptom is observed on a Cisco router only when LDP (as opposed to TDP) is
used and when a large number (more than 250) of LDP neighbors and a large number of IP prefixes
become unreachable at the same time.
Workaround: There is no workaround.
CSCej04699
Symptoms: The output of the show ip hardware-cef tofab prefix command may display incorrect
information for Engine 5 line cards.
Conditions: This symptom is observed on a Cisco 12000 series that functions in a scaled routing
environment with more than 100,000 routes.
Workaround: There is no workaround.
CSCej07539
Symptoms: Multicast traffic does not resume fully after you have removed the active PRP from the
router.
Conditions: This symptom is observed on a Cisco 12000 series that runs the c12kprp-p-mz image of
Cisco IOS Release 12.0(28)S4 and that is configured with redundant PRPs that function in RPR+
mode. The router has two channelized OC-12 line cards that are configured with mVPNs.
Workaround: There is no workaround.
CSCej09368
Symptoms: On an Ethernet over AToM link, an abnormal queue depth may occur for Time-Based
WRED and Byte-Based-WRED.
Conditions: This symptom is observed on a Cisco 7500 series but is platform-independent.
Workaround: There is no workaround.
CSCej10404
Symptoms: Fast Reroute (FRR) fails on a remote provider (P) router, causing packet loss.
Conditions: This symptom is observed on a Cisco 12000 series that functions as a P router in the
following topology:
One P router (P1) connects to another P router (P10) via a primary tunnel that is configured on
a 1-port 10-Gigabit Ethernet Engine 5 SPA. (P10 functions as the tunnel head-end.)
There is a backup next-hop (NHOP) FRR protection tunnel via an LSP path between P1 and
P10.
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