Specifications

1072
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S6
• CSCei52380
Symptoms: The entry for a tunnel is missing from the mplsOutSegmentTopLabel column of the
MPLS-LSR-MIB.
Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.4 when a
mibwalk is performed on the mplsOutSegmentTopLabel object. The symptom may also occur in
other releases.
Workaround: There is no workaround.
• CSCei54336
Symptoms: An MPLS LER does not impose labels for traffic that follows the default route, causing
traffic to be forwarded via IP.
Conditions: This symptom is observed on a Cisco 12000 series when the default route has two equal
paths, when the ingress line card is an ISE line card, and when the default router is learned via OSPF.
The symptom may also occur for other protocols.
Workaround: Use a single path for the default route. If this is not an option, there is no workaround.
• CSCei62762
Symptoms: Router may generate and/or forward crafted IP packets with the source IP address being
the routers tunnel interface for GRE or mGRE tunnels. Incorrect packet decoding may be seen with
“debug tunnel.”
Conditions: The router needs to receive a specially crafted GRE packet sent to the tunnel end-point.
The outer IP packet must come from the configured tunnel source and be sent to the configured
tunnel destination IP address Present Routed bit must be set to 1.
Workaround: Upgrade Cisco IOS to a version containing fixes for: CSCuk27655 or CSCea22552 or
CSCei62762.
Further information: On the 6th September 2006, Phenoelit Group posted an advisory:
* Cisco Systems IOS GRE decapsulation fault
Cisco’s statement and further information are available on the Cisco public website at:
http://www.cisco.com/warp/public/707/cisco-sr-20060906-gre.shtml
• CSCei71659
Symptoms: SNMP polling returns a “no such instance” response. This is improper behavior: instead
of the “no such instance” response, a counter should indicate zero.
Conditions: This symptom is observed on a Cisco 7500 series when a class is defined in an input
policy map but no traffic has been sent to that class. The symptom may be platform-independent.
Workaround: There is no workaround.
• CSCei83644
Symptoms: A nondefault configuration becomes lost for a serial interface on a channelized OC-48
ISE line card or on a 4-port OC-12 ISE line card.
Conditions: This symptom is observed on a Cisco 12000 series after you have reloaded the router.
Workaround: There is no workaround.
• CSCei84343
Symptoms: IP packets that are forwarded from an Engine 6 interface on a Cisco 12000 series to an
iBGP route may not reach the destination node.