Cisco Cisco IOS Software Release 12.0 S Release Notes
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Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S5
This situation is caused by a very rare event in the Address Resolution Protocol (ARP) code that
may cause data structure corruption, which results in system instability. Because of the rare nature
of this event, the affected router may experience intermittent hangs at intervals of hours up to several
months. There is no workaround. (Upgrade a susceptible router to a Cisco IOS software release in
which this caveat has been resolved.)
may cause data structure corruption, which results in system instability. Because of the rare nature
of this event, the affected router may experience intermittent hangs at intervals of hours up to several
months. There is no workaround. (Upgrade a susceptible router to a Cisco IOS software release in
which this caveat has been resolved.)
Note
This caveat does not apply to a router that is configured with one or more single-port Gigabit
Ethernet line cards.
Ethernet line cards.
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CSCdu29618
Under certain conditions on a Cisco 12000 series Internet router, Engine 4 line cards may update
Cisco Express Forwarding (CEF) entries slower than Engine 2 line cards do. There is no
workaround.
Cisco Express Forwarding (CEF) entries slower than Engine 2 line cards do. There is no
workaround.
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CSCdu22137
An Engine 4 line card may display the following messages when it encounters certain non-IP
packets.
packets.
SLOT 3:*May 10 10:46:59 UTC: BHdr->len-8 < IP->tot_len
Workaround: Reload the line card.
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CSCdw29949
If you enable tag-to-tag load balancing on a Cisco 12000 series Internet router with an Engine 4 line
card that serves as an ingress line card, the router stops forwarding traffic.
card that serves as an ingress line card, the router stops forwarding traffic.
Workaround: Enter the clear ip route * command.
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CSCdu64069
IP coloring (IP marking) may fail to mark a packet if IP coloring is configured on an interface with
an input Access Control List (ACL), or if any interface on a Cisco 12000 Internet Router has an
output that has an output ACL. ACL will still function as normal. This condition only occurs if IP
coloring is configured on an E2 line card. There is no workaround.
an input Access Control List (ACL), or if any interface on a Cisco 12000 Internet Router has an
output that has an output ACL. ACL will still function as normal. This condition only occurs if IP
coloring is configured on an E2 line card. There is no workaround.
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CSCdv01350
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0 S may see Internet
Group Management Protocol (IGMP) mtrace response packets (protocol=2, IGMP type=0x1E) stay
in an interface input hold queue indefinitely. These packets may eventually fill up the interface input
hold queue and cause packet drops.
Group Management Protocol (IGMP) mtrace response packets (protocol=2, IGMP type=0x1E) stay
in an interface input hold queue indefinitely. These packets may eventually fill up the interface input
hold queue and cause packet drops.
Workaround: Reload the router to clear the packets from the input hold queue, and increase the input
hold queue depth using the hold-queue queue-length interface configuration command.
hold queue depth using the hold-queue queue-length interface configuration command.
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CSCdx20954
A Cisco 12000 series OC-3 line card may reload unexpectedly and then recover. There is no
workaround.
workaround.