Specifications

1360
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(27)S1
Workaround: Reload the secondary RP.
• CSCed43829
Symptoms: Random Early Detection maintains an average length of the outbound queue of a class
of traffic, and randomly discards newly arriving packets when the average falls within the
configured range. A Cisco 10000 series router, that is running any of the identified Cisco IOS
software, contains an error in the average queue length computation which makes Random Early
Detection too sensitive to the instantaneous queue length.
Conditions: This problem is seen on the Cisco 10000 series routers that are running all Cisco IOS
releases identified in this report.
Workaround: There is no workaround.
• CSCed46856
Symptoms: Most multicast traffic is dropped if ingress interface is a E4+ and netflow is configured.
Conditions: This symptom occurs when multicast traffic is forwarded down shared tree, for
example, forwarded by (*, g); ingress interface is E4+; and netflow is configured.
Workaround: Either unconfigure netflow or disable SPT threshold to move to the shortest path tree.
• CSCed47409
Symptoms: In Cisco IOS software that is running Multiprotocol Label Switching (MPLS), a router
may reload after accessing a freed Label Information Base (LIB) entry. When the symptom occurs,
an error message similar to the following is likely to precede the reload:
%TIB-3-LCLTAG: 10.10.10.10/10.10.10.10, tag advert; unexpected tag state=13
Conditions: This symptom is observed when a very uncommon timing of a Label Distribution
Protocol (LDP) events occurs. The symptom may occur with LDP or Tagswitching Distribution
Protocol (TDP).
Workaround: There is no workaround.
• 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.