Specifications
19
Release Notes for Cisco IOS Release 12.0 S
78-7130-11 Rev. B0
New and Changed Information
The 1OC-48/STM-16 SRP line card allows networks to:
• Provide transmit packet priority with 3 separate queues to prevent head-of-line blocking:
–
Control packets are never rate-shaped or back-pressured by the Ring Access Controller (RAC)
–
High-priority packets are rate-shaped by the RAC
–
Low-priority packets are rate-shaped by the RAC
• Priority-map 8 levels IP/SRP into 2 levels of priority (high and low)
–
Software-selectable rate shaping (rate=X or no shaping) for both high- and low-priority data
(RAC)
–
Packet priority determined by type of service (ToS) byte in IP Header (RAC + L3)
• Accept or reject a packet from a particular host
• Transmit Spatial Reuse Protocol (SRP) encapsulation at full rate
• Transmogrify an SRP packet into a Packet-over-SONET (POS) packet in order to allow fast path
switching in the PSA.
• Transit Path Performance Monitors
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High/low queue depth (avg, min, max)
–
High/low queue packet delay (avg, min, max)
–
Packet and byte counts by source or destination MAC address
• Receive Path Performance Monitors
–
Packet and byte counts by source or destination MAC address
• Monitors for incoming and outgoing packets in RAC with separate SRP interface counters
See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/core/cis12012/bfrcfig/10567srp.htm#xtocid2983614
3-Port Gigabit Ethernet Line Card
Platforms: Cisco 12000 series
The 3-Port Gigabit Ethernet line card provides Cisco 12000 series routers with three optical Gigabit
Ethernet interfaces, which operate faster than 1-Gbps, on a single card. These interfaces are designed
to operate as trunks between Cisco 12000 series gigabit switch routers (GSRs) and other routers or
Layer 2 switches. These connections are concatenated, and provide for increased efficiency by
eliminating the need to partition the bandwidth. The 3-Port Gigabit Ethernet Line card will provide two
ports at full line rate provided the third port is shut down. With all three ports turned on, the 3-Port
Gigabit Ethernet line card will balance the load across all three ports up to the card packet forwarding
limitations of 4 million packets. See the following document for further information:
http://www.cisco.com/univercd/cc/td/doc/product/core/cis12012/bfrcfig/10551ge3.htm
Distributed GRE Tunneling
Platforms: Cisco 7500/RSP series
The Distributed generic routing encapsulation (GRE) Tunneling Support feature allows GRE IP and
other features, such as Web Cache Communication Protocol (WCCP) tunneling, to be performed on
VIP-based linecards for the Cisco 7500/RSP platform. The tunneling is performed using recursive or
“double” switching techniques that are currently deployed on existing non-distributed platforms, the