Cisco Cisco IOS Software Release 12.0 S Release Notes

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A Cisco 7500 series router with a Multichannel T3 Port Adapter (PA-MC-2T3+) may report cyclic 
redundancy check (CRC) errors when it is configured with a CRC-32. 

Workaround: Use the port adapter with CRC-16 instead. 

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A Cisco 12000 series router with a single Route Processor (RP) that is running Cisco IOS 
Release 12.0(16)S or 12.0(16)S1 does not permit simultaneous configurations from multiple Telnet 
sessions. Only a single Telnet session is allowed to enter the configuration mode at any one time. 
This symptom does not occur on routers with dual route processors. 

Workaround: Add an additional RP onto the system to permit simultaneous configurations from 
multiple Telnet sessions. The additional RP can be removed after it has booted as a secondary RP.

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The show aps command requires an argument of either a group number, a POS interface ID, or a 
SONET controller interface ID.  The default form of the command with a defaulted argument is 
rejected. There is no workaround. 

CSCdu22137

An Engine 4 line card may display the following messages when it encounters certain non-IP 
packets. 

SLOT 3:*May 10 10:46:59 UTC: BHdr->len-8 < IP->tot_len

Workaround: Reload the line card. 

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A Cisco router with an Engine 4 line card that is running Cisco IOS Release 12.0(16.6)S3 may 
reload while running line rate traffic. There is no workaround.

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A Cisco router that is running Cisco IOS Release 12.0(17.1)S, 12.1(3.1), or 12.2(3.1) or later that is 
configured for Hot Standby Router Protocol (HSRP) on only certain Inter-Switch Link (ISL) 
subinterfaces may experience spurious memory access. This situation may occur when HSRP is not 
configured on all ISL subinterfaces.

Workaround: Configure HSRP on all ISL subinterfaces. 

CSCdu42275

Applying a large access-list (approximately 3,000 lines) to a Cisco 3-Port Gigabit Ethernet line card 
may cause the router to reload. There is no workaround.

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If a single-port OC-48 line card is configured as the tunnel server card while installed in slot 0 of a 
Cisco 12000 series Internet router, the output of the showing running-configuration command 
does not show the “hw-module slot0 mode server” line. In this situation, if the router is reloaded, 
the line card is not configured to act as the tunnel server and all Universal Transport Interface (UTI) 
tunnels that are present on the router fail.

Workaround: Manually configure the line card to act as the sever by entering the hw-module slot0 
mode server command.

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The output of the show ip cef inconsistency record command may not include expected event log 
entries for the recorded inconsistency occurrences. There is no workaround.