Cisco Cisco IOS Software Release 12.0 S Release Notes
2270
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S7
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CSCuk23524
A Cisco 12000 series router may experience some missing prefixes in the Cisco Express Forwarding
(CEF) tables on some line cards after the router is reloaded or when an online insertion and removal
(OIR) is performed on a line card.
(CEF) tables on some line cards after the router is reloaded or when an online insertion and removal
(OIR) is performed on a line card.
Workaround: Enter the clear cef linecard command on each slot after a reload or OIR to ensure that
the CEF table is correctly downloaded.
the CEF table is correctly downloaded.
Resolved Caveats—Cisco IOS Release 12.0(17)S7
Cisco IOS Release 12.0(17)S7 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S7. This section describes only severity 1 and 2
caveats.
section are resolved in Cisco IOS Release 12.0(17)S7. This section describes only severity 1 and 2
caveats.
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CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
Resolved Caveats—Cisco IOS Release 12.0(17)S6
Cisco IOS Release 12.0(17)S6 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S6. This section describes only severity 1 and 2
caveats.
section are resolved in Cisco IOS Release 12.0(17)S6. This section describes only severity 1 and 2
caveats.
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CSCdx06621
If multiple routers are advertising the same prefix in Type-5 or Type-7 link-state advertisements
(LSAs), a router may reload with a bus error while the shortest path first (SPF) algorithm is
computed. There is no workaround.
(LSAs), a router may reload with a bus error while the shortest path first (SPF) algorithm is
computed. There is no workaround.
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CSCdx29393
If an Engine 2, 16-port OC3 line card is configured with 16 different input ACLs, Cisco Express
Forwarding (CEF) may get disabled on the line card when about 100K Border Gateway Protocol
(BGP) routes are present. There is no workaround.
Forwarding (CEF) may get disabled on the line card when about 100K Border Gateway Protocol
(BGP) routes are present. There is no workaround.
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CSCdx32658
On a Cisco 12000 series Internet router, if you ping the loopback address from the west-end to the
east-end router, datagrams are dropped. The first packet size ranges to fail are the packets between
77 and 80 and between 605 and 608. Only these packet ranges are being dropped; all other packets
get through. There is no workaround.
east-end router, datagrams are dropped. The first packet size ranges to fail are the packets between
77 and 80 and between 605 and 608. Only these packet ranges are being dropped; all other packets
get through. There is no workaround.
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CSCdx65248
A memory leak on an OC3 (Eng0) line card may cause Cisco Express Forwarding (CEF) to be
disabled. There is no workaround.
disabled. There is no workaround.