Specifications

1227
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S
Background, PC = 400DC728.
-Traceback= 400DC730 40DBFE60 40DBFFD4 40DC0B14 400C5A04 400C59F0
Conditions: This symptom is observed when the default route gets updated to Engine 3 line cards
and is reported by these line cards as seen above. This situation may happen after an interface flap
or a routing update elsewhere in the network.
To determine if your line card is an Engine 3 line card, enter the show diag slot-number EXEC
command, in which the slot-number argument is the slot number that reports the message). In the
command output, you will see “L3 Engine: 3” for Engine 3 line cards.
Workaround: There is no workaround.
• CSCed49539
Symptoms: Field diagnostics may enable fabric FPGA loopback bits, causing a line card to remain
off the fabric.
Conditions: This symptom is observed on a Cisco 12400 series that runs Cisco IOS
Release 12.0(27)S.
Workaround: Enter the following commands for all fabric slots:
test mbus write slot 22000 FF test mbus write slot 22001 FF
• CSCed49733
Symptoms: The Cisco 10720 microcode will be reloaded upon reception of certain malformed
MPLS packets.
Conditions: An MPLS packet where the topmost label is an MPLS Aggregate Label (for either IPv4
or IPv6) and this label does not have the EOS bit set (that is, it is not the only label) will cause the
reload.
Workaround: There is no workaround.
Further Problem Description: This should be an extremely rare situation as such packets are not
allowed in MPLS, that is, IPv4/IPv6 aggregate MPLS labels must always be the only label on the
received label stack and therefore they must always have the EOS bit set. Reception of such a packet
implies that some other network element has generated an invalid MPLS packet.
• CSCed50426
Symptoms: All multicast packets are dropped with a VRF-lite configuration.
Conditions: This symptom occurs when MVPN is set up in a VRF-lite configuration.
Workaround: There is no workaround.
• CSCed50510
Symptoms: An IPC crash may be seen on a standby RP while upgrading from the gsr-p-mz image
of Cisco IOS Release 12.0(25)S1 to the gsr-p-mz image of Cisco IOS Release 12.0(27)S.
Tracebacks and error messages “%IPCGRP-3-UNKNOWNCMDMSG:” and
“%IPCGRP-3-SYSCALL:” may be seen as well.
Conditions: This symptom is observed on a Cisco 12416 router when following the recommended
upgrade procedure.
Workaround: There is no workaround.
• CSCed50514
Symptoms: A Cisco router reloads with an unexpected exception and tracebacks.
Conditions: This symptom occurs when a serial interface is configured and you try to remove the
AUG controller. See the following example: