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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(33)S1
Conditions: Occurs when Data-Link Connection Identifiers (DLCI) are deleted from Multilink
Frame Relay (MFR) interface, followed by a switchover.
Workaround: There is no workaround.
• CSCsl87418
Symptoms: The process IPC Seat Manager is permanently holding a CPU utilization of 40-50%.
Causes a considerable decrease in traffic and very slow response from the routers.
Condition: This behavior has been observed on several Cisco 12000 routers with PRP-1 running
Cisco IOS Release 12.0(32)SY4 and is conditioned to the following factors: - Several hundreds of
interfaces configured like channelized, multilink or virtual template interfaces. Every physical and
each of these interfaces has an HWIDB associated with it. - many linec ards in the chassis. - The ip
multicast-routing distributed command is enabled.
Workaround: Upgrade to PRP-2 and CPU would go down to 10-15% in this same process. Or if
feasible, disable ip multicast-routing distributed.
• CSCsl89425
Symptoms: Bidirectional Forwarding Detection (BFD) sessions do not scale. This symptom is
especially visible with an OSPF client when one of the peers is rebooted after configuring the
maximum number of BFD sessions.
Conditions: This symptom occurs when configuring maximum BFD sessions or total number of
BFD sessions too close to the maximum limit.
Workaround: Configure 90 percent of the maximum allowed BFD sessions.
• CSCsl92482
Symptoms: Fragmentation is handled incorrectly on GSR E5 line card. We can send up to around
2Gbps of fragmented traffic without performance impact. When the egress line card CPU reaches
100%, the rate of the fragmented traffic drops down to 50Mbps.
Conditions: Occurs when all CPU resources of the egress LC are consumed.
Workaround: There is no workaround.
• CSCsl93596
Symptoms: When the MTU is changed on the core-facing E0 LC, all the E0 cards in the router crash.
Conditions: This symptom is observed with bidirectional traffic with an L3VPN, L2VPN
configuration. There are also MPLS TE tunnels.
Workaround: There is no workaround.
• CSCsl93926
Symptoms: E5 line card configured for CFI and BFI may crash when passing mVPN traffic.
Conditions: This is observed with Cisco IOS Release 12.0(32)SY5.
Workaround: There is no workaround.
• CSCsl94410
Symptom: CPU hog condition occurs because of stressful BGP configuration.
Conditions: Occurs in Cisco IOS releases in which CSCsj17879.
Workaround: None
• CSCsl94784
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