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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(32)S1
Wide-Area Networking
• CSCsd06510
Symptoms: Unexpected drops may occur in the Multilink Frame Relay (MFR) output hold queue.
The drops persist under a very low (25 pps) transmit rate.
The MFR output hold queue may become congested, causing all traffic to fail.
After you have disabled the traffic source or shut down the ingress interface, the MFR output hold
queue may take as long as 15 minutes to “drain.”
Conditions: These symptoms are observed on a Cisco router when you run multicast traffic over
GRE tunnel interfaces that in turn use an MFR interface for transport.
Workaround: Disable multicast fast-switching.
• CSCsd21476
Symptoms: A router crashes when you attempt to delete a Frame Relay-to-Ethernet connection.
Conditions: This symptom is observed when you first remove the Frame Relay interface via an OIR
and then you attempt to delete the Frame Relay-to-Ethernet connection.
Workaround: Re-insert the Frame Relay interface before attempt to delete the Frame
Relay-to-Ethernet connection.
Resolved Caveats—Cisco IOS Release 12.0(32)S1
Cisco IOS Release 12.0(32)S1 is a rebuild of Cisco IOS Release 12.0(32)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(32)S1 but may be open in previous Cisco IOS releases.
This section describes only severity 1, severity 2, and select severity 3 caveats.
• CSCek24204
Symptoms: Multicast traffic stops leaving from a SPA that is installed in a SIP-400 after an RPR+
switchover is performed on the remote end.
Conditions: This symptom is observed on a Cisco 12000 series when the remote end is also a
Cisco 12000 series in which a SIP-400 is installed.
Workaround: Enter the clear ip mds linecard linecard-slot-number command on the SIP-400 that
is installed in the local Cisco 12000 series. Note that the linecard-slot-number argument represents
the SPA and affected output port.
• CSCsb78504
Symptoms: When you enter the clear cef linecard command on a SIP-400 or SIP-600 in which
channelized T1 and T3 SPAs are installed that are configured with MFR and MLP interfaces, the
MFR interfaces may flap. The symptom may also occur when a line card that has MFR and MLP
interfaces configured is reloaded or when the router is reloaded.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(32)S, that functions as a PE router, and that has multilink interfaces configured. The
symptom is reproducible when CPU-intensive applications are running on the router while a large
number of multilink interfaces is brought up. Note that the symptom does not occur for non-SPA
line cards.
Workaround: Shut down the multilink interfaces. When the router is stable (that is, after CEF is
cleared or after the line or router is reloaded), bring up the multilink interfaces.
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