Specifications

1223
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(28)S
• CSCed40933
Cisco Internetwork Operating System (IOS) Software is vulnerable to a Denial of Service (DoS)
attack from crafted IPv6 packets when the device has been configured to process IPv6 traffic. This
vulnerability requires multiple crafted packets to be sent to the device which may result in a reload
upon successful exploitation.
More details can be found in the security advisory, which is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050126-ipv6.shtml.
• CSCed41067
Symptoms: When the cache is lost, a router correctly detects that the cache is no longer available,
but HTTP requests are still forwarded to the cache.
Conditions: This symptom is observed on a Cisco 7500 series with dCEF enabled.
Workaround: Disable dCEF.
• CSCed41231
Symptoms: An alignment error may cause a Cisco router to reload unexpectedly.
Conditions: This symptom is observed under rare conditions (an “extreme corner case”) on a
MIPS-based Cisco platform or on a Versatile Interface Processor (VIP), port adapter, or line card
that contains a MIPS processor. The symptom is not release-dependent and may occur in all
Cisco IOS releases.
Workaround: There is no workaround.
Further Problem Description: All 7500 VIPs and 7200 NPEs use MIPS based processors. Additional
platforms that use MIPS processors are:
2691,3620,3631,3640,3660,3725,3745,4500,4500-M,4700,4700-M,AS5300,AS5400,AS5450,
AS5800 Router Shelf,AS5800 System Controller (3640 based),7120,7140,UBR7100, UBR7200 -
All NPEs,7301,7304,7400,6500 MSFC,6500 MSFC2,7600 MSFC,7600 MSFC2,
10000,UBR10012,12000 GRP, most (if not all) 12000 line cards.
• CSCed42587
Symptoms: When sending 10 packets from AGT-SRC to AGT-Dest with TTL set to 3 on all packets,
the first packet is dropped.
Conditions: This symptom occurs under the following conditions:
– Applies only to E2 LCs.
– Interface with ACL rule with the “log” option
– Packets with TTL of 3
Workaround: Remove the “log” option from the ACL rule.
• CSCed43228
Symptoms: On a Cisco 12000 series router with 2 GRPs which support SSO mode (Cisco IOS
Release 12.0(24)S and later), when any Engine3 (E3 aka ISE) card is inserted after bringing up both
GRPs in SSO mode, the applied service policy which has WRED configured on this interface, does
not sync with standby GRP.
Conditions: The problem only happens for any E3 card that was not in the chassis when the
secondary RP booted. This will be the case when adding a new E3 LC to an already running system
and configuring it for the first time. E3 cards that were in the chassis by the time the secondary RP
finished booting will not exhibit this behavior.
Workaround: Reload the secondary RP.