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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Caveats
Resolved Caveats—Cisco IOS Release 12.0(33)S6
• CSCta76975
Symptoms: IPv6 multicast traffic drops are observed when IPv6 multicast traffic is sent at a high
rate. These multicast packets are punted to the RP; this can be seen through the show ipv6 mflib
<multicast address> CLI.
Conditions: This symptom is observed upon router reload.
Workaround: There is no workaround.
• CSCta77678
Symptoms: RTP timestamp on the RFC 2833 event is modified. IP Phones are using RFC 2833 to
transport the DTMF signals, which causes problems with the voicemail systems.
Conditions: This symptom occurs when RTP header compression is enabled.
Workaround: There is no workaround.
Further Problem Description: The problem disappears if cRTP is disabled. The issue is seen with
Class-Based cRTP configured and also with other cRTP configuration types.
• CSCtb08699
Symptoms: The traffic flow between the Cisco 12000 series PE routers and the core CRS router
stopped unexpectedly without any trigger, and the linecard had to be reloaded for recovery.
Conditions: The packet buffers in the ingress direction of the core-facing linecards of the
Cisco 12000 series were gradually being depleted. Once this happened, all the incoming packets
were dropped as seen in “no mem drop” below:
LC-Slot1# show contr tofab qm stat
135590 no mem drop, 193180 soft drop, 4167963929 bump count 0 rawq (High Priority)
drops, 0 rawq (Medium Priority) drops, 0 rawq (Low Priority) drops 0 dnq1 drops, 0
dnq2 drops 0 no memory (ns), 0 no memory hwm (ns) no free queue 0 126499 61990 15125
36 0 0 0 0 0 0 0 0 0 0 0
Workaround:
1) Clear the corrupted entry using the “clear ip route vrf <vpn-name> <prefix>” command on the RP.
2) Reload the linecard.
3) Reclaim the lost buffers by forced re-carve.
• CSCtb45062
Symptoms: A subinterface does not transmit traffic in the egress direction, the queue head and tail
stay frozen, and the txport is consistently back- pressured.
Conditions: These symptoms are observed under the following conditions:
–
12000-SIP-501 with SPA-8X1FE-TX-V2.
–
One Fast Ethernet interface with more than 468 subinterface VLANs.
–
All subinterfaces with the same policy (SHAPE_OUT_960).
policy-map VBL class
class-default
police cir 96000 bc 4470 be 4470 conform-action set-dscp-transmit af11
exceed-action
set-dscp-transmit default
policy-map SHAPE_OUT_960
class class-default
shape average 960000
service-policy VBL
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