Specifications

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Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
New and Changed Information
The Low Latency Queueing feature provides strict priority queueing for CBWFQ, reducing jitter in
voice conversations. Configured by the priority command, Low Latency Queueing enables use of a
single, strict priority queue within CBWFQ at the class level, allowing you to direct traffic belonging
to a class to the CBWFQ strict priority queue.
In the event of congestion, when the bandwidth is exceeded, policing is used to drop packets. Voice
traffic enqueued to the priority queue is User Datagram Protocol (UDP)-based and therefore not
adaptive to the early packet drop characteristic of Weighted Random Early Detection (WRED).
When congestion occurs, traffic destined for the priority queue is metered to ensure that the bandwidth
allocation configured for the class to which the traffic belongs is not exceeded. See the following
document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120xe/120xe5c/
llqvip.htm
New Revision of System Controller Chip for NPE-175/NPE-225
Platforms: Cisco 7200 series
This feature adds support for a new revision of a hardware component that fixes a previous error. For
the benefit of users that have not upgraded to the new hardware, it will also exhibit the following
warning error message that indicates the old hardware revision:
PLATFORM-4-RECALLED_NPE: Old version NPE-175/225 with Rev= 0xNN system controller.
Contact [e-mail] for replacement.
Cisco 7200 series routers with NPE-175 or NPE-225 network processing engines must upgrade to
Cisco IOS releases that incorporate this change (for example, Cisco IOS Release 12.0(9) and later
releases or Cisco IOS Release 12.0(9)S and later releases). Use of older Cisco IOS releases might result
in unpredicted malfunctions. See the following document for further information:
http://www.cisco.com/warp/customer/770/fn8611.shtml
Route Switch Processor (RSP8)
Platforms: Cisco 7500/RSP series
The RSP8 is the newest main system processor module for Cisco 7500 series routers. In addition to
running the system software from DRAM, the RSP8 sends and receives routing protocol updates,
manages tables and caches, monitors interface and environmental status, and provides Simple Network
Management Protocol (SNMP) management and the interface between the console and Telnet.
The high-speed switching section of the RSP8 communicates with and controls the interface processors
on the high-speed CyBus. This switching section of the RSP8 decides the destination of a packet and
switches it based on that decision. See the following document for further information:
www.cisco.com/cc/td/doc/product/core/cis7507/7507cfig/6586rsp8.htm