Specifications

1333
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S2
Workaround: There is no workaround. The fix for this DDTS adds the new show monitor
event-trace psar command to show any bursty error events that are traced but not visible in the
output of the show logging command.
• CSCed15913
Symptoms: An Engine 0 12xE3 line card may reload when changing the MTU on an Engine 2
3x1GE line card.
Conditions: This symptom is observed on a Cisco 12416 router that is running the gsr-p-mz image
of Cisco IOS Release 12.0(26)S.
Workaround: Ensure there is no traffic going through the Engine 0 12xE3 and Engine 2 3x1Ge line
cards when attempting to change the MTU.
• CSCed21111
Symptoms: There is no console response from the primary or secondary route processor.
Conditions: This symptom occurs after the redundancy force-failover main-cpu EXEC command
is sent for the second cutover.
Workaround: There is no workaround.
• CSCed22358
Symptoms: A Cisco 12000 series may forward packets to an incorrect interface. This behavior can
been seen by looking at the hardware CEF entry on this input line card:
execute-on slot x show ip hardware-cef a.b.c.d (a.b.c.d is the destination IP address)
The output looks similar to the following, in which the CEF lookup is null:
LC-Slot0#show ip hardware-cef a.b.c.d Leaf FCR 2 0x784C6FC0 found 2 deep alpha ip
loadbalance: 0x78198D00 - lbl not equal. cef lookup NULL
After clearing the route, the output looks as follows:
LC-Slot0#show ip hardware-cef a.b.c.d Leaf FCR 4 0x784C6FC0 found 2 deep Fast
Adjacency: alpha adjacency: 0x701E8280 [0-7] oi 0x4019100 oq 4000 in 15 ab 0 hl 20 gp
11 tl 0 loq BC01 15/0 mtu 4470 packets 1750013440 bytes 776867999767
Output Queue / Local Output Queue Bundle: [0-7] output queue 0x4000 local output queue
0xBC01
This problem may cause packets to be dropped because a loop is created and the TTL expires for
the packets.
Conditions: This symptom is observed under very specific conditions on a Cisco 12000 series that
runs Cisco IOS Release 12.0(24)S or a later release when traffic that enters an Engine 3 line card
toggles between a static-to-null route and a more specific route as the destination.
Workaround: Avoid the specific conditions mentioned above. Clearing the route resolves the
problem only temporarily.
• CSCed28604
Symptoms: Enabling autonegotiation on an E1 Gigabit Ethernet interface causes the standby route
processor (RP) to fail.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(26)S.
Workaround: Stop the traffic, enter the shutdown command on the interface, configure
autonegotiation on the interface, enter the no shutdown command on the interface, and resume the
traffic.