Specifications

1291
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S4
Because the distribute-list interface command is not implemented in the IPv4 VRF address-family,
there is no other way to filter networks received in updates via a VRF interface.
Conditions: This symptom is observed in all Cisco IOS releases that integrate the fix for
CSCee32557. A list of the affected releases can be found at
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCee32557. Cisco IOS
software releases that are not listed in the “First Fixed-in Version” field at this location are not
affected.
Workaround: In a configuration that is mentioned above, to filter networks received in updates, enter
the distribute-list extended-ACL-reference command in which the “source-part” of the extended
ACL specifies the prefixes and the “destination part” matches on the IP address of the RIP neighbor.
• CSCeg28402
Symptoms: Spurious memory accesses may occur on a Cisco 7500 series and may cause high CPU
usage on the RSP.
Conditions: This symptom is observed on a Cisco 7500 series that is configured for distributed
Multilink PPP (dMLP) and that functions in an MPLS network.
Note that packet switching for MPLS packets over MLP bundles is not supported at the RSP level
in Cisco IOS Release 12.0S.
Workaround: There is no workaround.
Further Problem Description: The fix for this caveat causes packets that are sent to the RSP for
switching to be dropped. Distributed forwarded packets are forwarded correctly.
• CSCeg30179
Symptoms: Removing a policy that has shape and bandwidth in the same class (in that same order)
may cause a router to crash.
Conditions: This symptom is observed when the router functions under a traffic load.
Workaround: There is no workaround.
• CSCin79436
Symptoms: A Cisco 12000 series does not fragment IP traffic while switching the traffic into the
MPLS core even when the size of the incoming IP packets exceeds the IP MTU of the egress
interface. This situation causes the traffic to be dropped on the next hop router.
Conditions: This symptom is observed in Cisco IOS Release 12.0(26)S or a later release when all of
the following conditions are present:
- The traffic leaves through an egress interface of an Engine-3 line card (on the MPLS core side).
- The imposed label stack contains only explicit null labels.
- The size of the incoming IP packets exceeds the IP MTU of the egress interface.
Workaround: Ensure that the IP MTU of the egress interface exceeds the maximum size of the
incoming IP packets.
• CSCin79899
Symptoms: When error recovery is performed on a 3-port Gigabit Ethernet (GE) line card that has
port 0 in the shutdown state, the 3-port GE line card stop passing traffic on all ports.
Conditions: This symptom is observed on a Cisco 12410 that runs Cisco IOS Release 12.0(23)S or
a later release and that is configured with an Engine 2 3-port line card.
Workaround: Reload the 3-port GE line card and leave port 0 in the up/down state.