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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(31)S1
You can check the current status of the TCAM allocation with:
exec slot <slot number> sh controllers tofab alpha tcam carve | i
IPv6_128|Total|Mask|RX_TOP_NF
Beware: With this workaround, all IPv6 packets will be process-switched on the line card, so make
sure you do not have too much IPv6 traffic, or you will get 100% CPU usage on the line card and
probably other problems.
[3] Enable IPv6 BGP Dampening to limit the memory leak:
router /jointfilesconvert/415844/bgp XXX
...
address-family ipv6
/jointfilesconvert/415844/bgp dampening
...
exit-address-family
Note: The problem was not present in Cisco IOS Release 12.0(30)S.
• CSCei90530
Symptoms: An interface of a clear channel T3/E3 SPA that is installed in a 12000-SIP-400 is in a
down state after you have entered the redundancy force-switchover command.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with two PRPs that
function in RPR+ mode.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface to bring the interface back up.
• CSCsa43329
Symptoms: A Cisco 12000 series may crash because of a bus error when you configure a loopback
on one of the E3 interfaces on a 6-port E3 (6E3-SMB) or 12-port E3 (12E3-SMB) line card.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(28)S.
Workaround: Do not configure a loopback on one of the E3 interfaces.
• CSCsa57562
Symptoms: IPC messages may be generated on a 1-port channelized OC-12 (DS3) line card and the
line card may be disabled and reload.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(28)S or Release 12.0(28)SW1 when OC-3 subinterfaces are configured on the 1-port
channelized OC-12 (DS3)line card, when these OC-3 subinterfaces are configured for Frame Relay,
when the rate-limit command is enabled, and when L2TPv3 traffic is being processed.
Workaround: There is no workaround because the rate-limit command is not supported in a
configuration in which L2TPv3 traffic is being processed.
• CSCsa59109
Symptoms: At random, subinterfaces loose the ability to ping a directly-connected peer.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with two 3-port
Gigabit Ethernet line cards.
Note that although regular and extended pings do not work, pings that use the record option do work.
Workaround: Reload microcode onto the affected line cards.
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