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(18)S
CSCdu04427
A Cisco 12000 series router with an enabled Ethernet interface on the route processor may not boot 
up properly when running Cisco IOS Release 12.0(16.6)S. 
Workaround: Boot the router through the Ethernet 0 interface, and shut down the Ethernet 0 interface 
immediately after the router has completely booted up. 
CSCdu06930
A Cisco 7500 series router that is running Cisco IOS Release 12.0(16)S with distributed Multilink 
PPP (MLPPP) enabled may experience bounced traffic if the amount of traffic that is sent through 
the multilink interface is double the capacity of the interface. There is no workaround.
CSCdu07275
Conform rates that are not set to be a multiple of 200,000 bps may not function properly. The 
discrete level of the conform rate for OC-192 or Quad OC-48 line cards should be set to a multiple 
of 200,000 bps. For example, a conform rate from between 300,000 bps and 500,000 bps should be 
set to an actual conform rate of 400,000 bps. 
Workaround: Configure the conform rate to be a multiple of 200,000 bps.
CSCdu07559
A gsr with a ATA disk (SAN DISK) in the first PCMCIA slot (disk0:) may crash (Software forced 
crash) when the latest conn_isp image 120(16.6)S is loaded. 
CSCdu07732
When a Packet-over-SONET (POS) line card is reinserted after it is replaced by another POS card, 
snmpwalk works on the ifTable for all interfaces but snmpget may fail on some POS interfaces. 
There is no workaround. 
CSCdu08444
Entering the show ip psa ip-address command on a router that is configured with per prefix 
accounting will cause an Engine-2 line card (for example, OC-48) to reload. 
Workaround: Disable per prefix accounting.
CSCdu09160
A Cisco 12000 series router that has Engine 4 line cards may not support ingress or receive Weighted 
Random Early Detection (WRED) for both multicast and unicast traffic. There is no workaround.
CSCdu09725
It is not possible to write Crashinfo data to an ATA sandisk from a Cisco router that is running 
Cisco IOS Release 12.0 S or Cisco IOS Release 12.0 ST. This caveat is not present in other 
Cisco IOS releases. There is no workaround.
CSCdu01019
On a Cisco 12400 Internet router that is running with tag switching enabled, the show interface 
accounting 
command may not register the transmitted tagged packets in Cisco IOS Release 
12.0(16.5)S. There is no workaround.
CSCdu10912
When an online insertion and removal (OIR) is performed on a primary clock switched card (CSC) 
fabric card after the hw-module slot_number shut command is entered, faulty OIR messages may 
be displayed. There is no workaround.