Specifications

1166
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S1
• CSCee14840
Symptoms: A Cisco 12000 series running Cisco IOS Release 12.0(26)S1 may advertise erroneous
IPv6 networks when configured for both 6PE and Route Reflector operation.
Conditions: This symptom is observed on a network in which 6PE is implemented on an existing
dual-stack (IPv4 and IPv6) configuration.
Workaround: There is no workaround.
• CSCee16725
Symptoms: MPLS VPN VRF labels fail to be updated onto core-facing line cards such that the VPN
traffic entering the core-facing line cards is punted to the RP.
Conditions: This symptom is observed in a setup with two parallel paths between a PE router and a
CE router that run Cisco IOS Release 12.0 S. There are around 10,000 VRF routes advertised
through both the eBGP sessions that are established between the PE router and the CE router. When
the link flaps, the next hop of all the BGP routes changes to the next hop via the other link. When
this situation occurs, the core-facing line cards may miss the label forwarding entry for some of the
VPN prefixes.
Workaround: To recover from the problem after it has occurred, enter the clear cef linecard
command on the affected core-facing line card.
To avoid the problem from occurring, do not redistribute the PE-CE link subnet into BGP.
• CSCee18889
Symptoms: If link bundling is configured on any line card in the router and the link bundle is loaded
onto an Engine 2 line card that has VPN on FR subinterfaces and that is processing traffic, the
Engine 2 line card may reload.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image
of Cisco IOS Release 12.0(28)S.
Workaround: There is no workaround.
• CSCee22450
Symptoms: A subinterface on a Cisco 10000 series may drop packets because of unicast RPF check
failures, even though the interface is not configured with uRPF.
Conditions: This symptom is observed on an ATM interface with several subinterfaces when there
is at least one subinterface that has uRPF configured. Disabling uRPF on the subinterface still leaves
uRPF enabled, even though the CLI indicates it is not enabled. This may also occur with Frame
Relay subinterfaces.
Workaround: Select a subinterface that has uRPF configured, then deconfigure and reconfigure it.
This updates all subinterfaces on the interface in such a way that uRPF is correctly enabled or
disabled.
• CSCee22810
Symptoms: On a Cisco 7500 series, all PVCs may suddenly enter the down state and remain in this
state for about two minutes before they come back up. During the DLCI down state, the subinterface
does not go down and no notifications are observed in the message log.
Conditions: This symptom is observed on a Cisco 7500 series that is configured with an RPS4+ or
an RSP8 and that runs the rsp-jsv-mz image of Cisco IOS Release 12.2(12i). In addition, the router
is configured with an 8-port serial port adapter and an HSSI port adapter, is configured for Frame
Relay, and has more than 450 PVCs/DLCIs. Note that the symptom may be platform-independent
and may also occur on other Cisco platforms in a similar configuration.
Workaround: There is no workaround.