Cisco Express Forwarding (CEF)

Total Page:16

File Type:pdf, Size:1020Kb

Cisco Express Forwarding (CEF) White Paper Cisco Express Forwarding (CEF) Cisco’s Express Forwarding (CEF) technology for IP is a CEF avoids the potential overhead of continuous cache scalable, distributed, layer 3 switching solution designed to churn by instead using a Forwarding Information Base (FIB) meet the future performance requirements of the Internet and for the destination switching decision which mirrors the Enterprise networks. It represents the latest advance in Cisco entire contents of the IP routing table. i.e. there is a IOSTM switching capabilities that includes NetFlowTM one-to-one correspondence between FIB table entries and Switching and Distributed Switching. CEF is also a key routing table prefixes; therefore no need to maintain a component of Cisco’s Tag Switching architecture. route-cache. Express Forwarding evolved to best accommodate the This offers significant benefits in terms of performance, changing network dynamics and traffic characteristics scalability, network resilience and functionality, particularly resulting from increasing numbers of short duration flows in large complex networks with dynamic traffic patterns. typically associated with Web-based applications and CEF Performance interactive type sessions. Existing layer 3 switching paradigms use a route-cache model to maintain a fast lookup CEF implements a Cisco patent-pending expedited IP table for destination network prefixes. The route-cache look-up and forwarding algorithm to deliver maximum layer entries are traffic-driven in that the first packet to a new 3 switching performance. Additionally Express Forwarding destination is routed via routing table information and as is less CPU intensive than route-caching therefore it allows part of that forwarding operation, a route-cache entry for more CPU horsepower to be dedicated to packet forwarding. that destination is then added. This allows subsequent CEF Scalability - dCEF packets flows to that same destination network to be Cisco’s Express Forwarding technology is optimized for switched based on an efficient route-cache match. These information distribution allowing it to take advantage of the entries are periodically aged out to keep the route cache distributed architecture of the high end Cisco IOS(tm) current and can be immediately invalidated if the network routers such as the C7500. Thus Distributed CEF (dCEF) topology changes. This ‘demand-caching’ scheme — delivers scalable switching capacity by providing each of the maintaining a very fast access subset of the routing topology C7500 Versatile Interface Processors (VIPs) with an identical information — is optimized for scenarios whereby the on-card copy of the FIB database enabling them to majority of traffic flows are associated with a subset of autonomously perform Express Forwarding and therefore destinations. However, given that traffic profiles at the core significantly increase aggregate throughput. CEF also uses of the Internet (and potentially within some large Enterprise Adjacency Tables to hold the layer 2 next hop addresses for networks) are no longer resembling this model, a new all FIB entries so that the associated prepend can be added switching paradigm was required that would eliminate the locally, thus minimizing latency, before switching between increasing cache maintenance resulting from growing linecards. Therefore in the case of dCEF on the C7500 numbers of topologically dispersed destinations and dynamic platform, the Route Switch Processor (RSP) is relieved of any network changes. switching operation and so has significantly more CPU power available to perform routing functions, management, network services etc. Copyright © 1997 Cisco Systems, Inc. All Rights Reserved. Page 1 of 4 C7500 Distributed Architecture Route Switch Processor Forwarding Routing Information Table Base IPC Versatile Interface Processor Versatile Interface Processor Versatile Interface Processor Forwarding Adjacency Forwarding Adjacency Forwarding Adjacency Information Information Information Table Table Table Base Base Base dCEF employs a reliable Inter Process Communications entries to be invalidated and then reestablished to reflect any (IPC) mechanism to ensure guaranteed and synchronized FIB topology changes. In networking environments which information and because of the correlation between FIB frequently experience significant routing activity (such as the entries and the routing table, updates are only sent to the VIP Internet backbone) this can cause traffic to be forwarded via linecards when changes in the routing topology occur. the routing table (which represents Cisco IOS(tm) Process Cisco’s upcoming Gigabit Switch Router (GSR) will also Level Switching) as opposed to via the route-cache (Cisco employ dCEF to deliver full topology forwarding at IOS(tm) Fast Switching). During major network convergence performance rates of millions of packets per second per or flux, performance can thus be sub-optimal. line card. Express Forwarding obviates this Process Switching/ Fast Switching scenario and since the FIB is topology-driven CEF Resilience rather than traffic-driven, CEF’s switching performance is Express Forwarding offers an unprecedented level of largely independent of and unaffected by network size or switching consistency and stability in large, dynamic dynamics. networks. This results from the fact that the FIB look-up table CEF Functionality contains all known routes therefore eliminating the potential Express Forwarding is feature-rich in that it can be used in for “cache-misses” which occur with demand caching conjunction with leading-edge Cisco IOS(tm) capabilities. schemes. i.e. if a route is not found in the forwarding cache, Even when deployed in dCEF mode, there is no compromise the first packet(s) then looks to the routing table to determine between performance and functionality, hence backbone the outbound interface and then a cache entry is added for networks can realize the benefits of Express Forwarding that destination. Since the cache information is derived from while still having the flexibility to offer Cisco IOS(tm) the routing table, routing changes cause existing cache network services. Copyright © 1997 Cisco Systems, Inc. All Rights Reserved. Page 2 of 4 These capabilities include: • Quality of Service – IP Precedence based Class of Service and Weighted Random Early Detection (wRED) support. • Load Balancing – Per destination (the default) and per packet over equal/unequal cost links for as many paths as known in the routing topology • Traffic Statistics – Byte and packet counts at a granularity of per-prefix, per-neighbour etc. • Media Independence – CEF currently supports Packet over Sonet, ATM/AAL5, Frame Relay, Ethernet, FDDI, HDLC and mPPP • Tunneling – Generic Route Encapsulation (GRE) • Cisco IOS(tm) subinterface support – allowing for the flexibility of per subinterface configurations e.g. MTU Express Forwarding and Netflow(tm) Switching When deployed along with CEF, NetFlow Switching is NetFlow Switching manages traffic in terms of flows between typically used at the periphery of the Layer 3 backbone network layer source-destination address pairs and unlike network and Express Forwarding used in the core since it is conventional destination-prefix based forwarding, it also most useful and efficient to perform any security, QoS or provides visibility to the application layer. By caching this accounting operations early in the data path and at the level of information on a per-session basis, NetFlow network boundary as traffic is forwarded to and from the Switching is designed to support complex packet filtering backbone: security without incurring any per-packet overhead. i.e. only Express Forwarding and Tag Switching the initial packet is passed through the Access Control Lists Tag Switching combines the price/performance and traffic (ACLs) and if allowed, used to build a NetFlow entry management capabilities of Layer 2 cell or frame switching containing address, port and application information such with the scalability and functionality of Layer 3 routing. This that subsequent packets belonging to that flow match this multilayer integration is achieved by having routers and entry and therefore do not need to also be compared against switches interconnect as peer networking devices, an the ACLs. NetFlow Switching’s traffic profiling capabilities, architecture that scales well beyond existing models. when used in conjunction with NetFlow Data Export, also Essentially the technology associates a small tag value with facilitate sophisticated network billing and accounting destination prefixes such that packets going to a particular applications. Traffic flows are now invariably short-lived and destination now have a tag prepended as they are switched to maximize performance entries are removed as soon as the across the network. This therefore allows Tag Switching particular flow finishes. In environments with very many devices to perform very efficient and fast forwarding concurrent flows, this can mean significant NetFlow decisions (using a technique known as ‘label-swapping’) and demand-cache maintenance, with the initial packet from new so deliver the switching speeds that will be required with flows used in establishing the entries having to be Process future line rates. Switched. Now, by using the Forwarding Information Base for flow creation, NetFlow Switching avoids this overhead. NetFlow Switching Cisco Express Forwarding • Deployed at backbone periphery • Deployed at Layer 3 network core for network services: for: Traffic Accounting Forwarding Performance
Recommended publications
  • Configuring Cisco Express Forwarding
    CHAPTER13 Configuring Cisco Express Forwarding This module contains information about Cisco Express Forwarding and describes the required and optional tasks for configuring a load-balancing scheme for Cisco Express Forwarding traffic. Load-balancing allows you to optimize resources by distributing traffic over multiple paths. Cisco Express Forwarding is an advanced Layer 3 IP switching technology. It optimizes network performance and scalability for all kinds of networks: those that carry small amounts of traffic and those that carry large amounts of traffic in complex patterns, such as the Internet and networks characterized by intensive web-based applications or interactive sessions. The following sections describe Cisco Express Forwarding: • Information About Cisco Express Forwarding, page 13-1 • Configuring Cisco Express Forwarding, page 13-6 • Configuration Examples for Configuring a Load-Balancing Scheme for Cisco Express Forwarding Traffic, page 13-11 Information About Cisco Express Forwarding Before using Cisco Express Forwarding or distributed Cisco Express Forwarding, you should understand the following: • Cisco Express Forwarding Benefits—Improved Performance, Scalability, and Resilience, page 13-1 • Media Supported by Cisco Express Forwarding, page 13-2 • Main Components of Cisco Express Forwarding Operation, page 13-3 • FIB Overview, page 13-3 • Cisco Express Forwarding Adjacency Tables Overview, page 13-4 • Cisco Express Forwarding Operation Modes—Central and Distributed, page 13-5 Cisco Express Forwarding Benefits—Improved Performance, Scalability, and Resilience Cisco Express Forwarding offers the following benefits: • Improved performance—Cisco Express Forwarding is less CPU-intensive than fast switching route caching. As a result, more CPU processing power can be dedicated to Layer 3 services such as quality of service (QoS) and encryption.
    [Show full text]
  • Implementing Cisco Express Forwarding
    Implementing Cisco Express Forwarding • Implementing Cisco Express Forwarding, on page 1 Implementing Cisco Express Forwarding Cisco Express Forwarding (CEF) is an advanced, Layer 3 IP switching technology. CEF optimizes network performance and scalability for networks with large and dynamic traffic patterns, such as the Internet, on networks characterized by intensive web-based applications, or interactive sessions. CEF is an inherent feature and the users need not perform any configuration to enable it. If required, the users can change the default route purge delay and static routes. Components Cisco IOS XR software CEF always operates in CEF mode with two distinct components: • Forwarding Information Base (FIB) database: The protocol-dependent FIB process maintains the forwarding tables for IPv4 and IPv6 unicast in the route processor . The FIB on each node processes Routing Information Base (RIB) updates, performing route resolution and maintaining FIB tables independently in the route processor . FIB tables on each node can be slightly different. • Adjacency table—a protocol-independent adjacency information base (AIB) CEF is a primary IP packet-forwarding database for Cisco IOS XR software. CEF is responsible for the following functions: • Software switching path • Maintaining forwarding table and adjacency tables (which are maintained by the AIB) for software and hardware forwarding engines The following features are supported for CEF on Cisco IOS XR software: • Bundle interface support • Multipath support • Route consistency • High availability features such as packaging, restartability, and Out of Resource (OOR) handling • OSPFv2 SPF prefix prioritization Implementing Cisco Express Forwarding 1 Implementing Cisco Express Forwarding Verifying CEF • BGP attributes download CEF Benefits • Improved performance—CEF is less CPU-intensive than fast-switching route caching.
    [Show full text]
  • Cisco IOS IP Switching Command Reference May 2008
    Cisco IOS IP Switching Command Reference May 2008 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3650 Switches)
    Cisco Express Forwarding This module contains an overview of the Cisco Express Forwarding feature. Cisco Express Forwarding is an advanced Layer 3 IP switching technology. It optimizes network performance and scalability for all kinds of networks: those that carry small amounts of traffic and those that carry large amounts of traffic in complex patterns, such as the Internet and networks characterized by intensive web-based applications or interactive sessions. • Finding Feature Information, page 1 • Information About CEF, page 1 • How to Configure CEF, page 9 • Configuration Examples for CEF, page 9 • Additional References, page 9 • Feature Information for Cisco Express Forwarding, page 11 Finding Feature Information Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required. Information About CEF This document presents the following topics to explain the changes you will find with the implementation of the Cisco Express Forwarding enhancements. This information should be helpful as you transition to Cisco IOS software that includes the Cisco Express Forwarding and MFI enhancements. The fifth and sixth topics provide information about the CLI changes implemented as part of the Cisco Express Forwarding enhancements.
    [Show full text]
  • IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Release 3S
    IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Release 3S Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Gibraltar 16.10.X Americas Headquarters Cisco Systems, Inc
    IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Gibraltar 16.10.x Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • CISCO IOS Asynchronous Transfer Mode Configuration Guide Full
    Cisco IOS Asynchronous Transfer Mode Configuration Guide, Release 15.0 Release 15.0 October 2, 2009 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 Text Part Number: THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • Netflow Configuration Guide, Cisco IOS Release 15S
    NetFlow Configuration Guide, Cisco IOS Release 15S Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS Release 15SY
    IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS Release 15SY Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • Configuring Netflow BGP Next Hop Support for Accounting and Analysis
    Configuring NetFlow BGP Next Hop Support for Accounting and Analysis First Published: June 19, 2006 Last Updated: April 15, 2011 This document provides information about and instructions for configuring NetFlow Border Gateway Protocol (BGP) next hop support. This feature lets you measure network traffic on a per BGP next hop basis. NetFlow is a Cisco IOS application that provides statistics on packets flowing through the router. It is emerging as a primary network accounting and security technology. Finding Feature Information Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the “Feature Information for NetFlow BGP Next Hop Support” section on page 9. Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required. Contents • Prerequisites for NetFlow BGP Next Hop Support, page 2 • Restrictions for NetFlow BGP Next Hop Support, page 2 • Information About NetFlow BGP Next Hop Support, page 3 • How to Configure NetFlow BGP Next Hop Support, page 3 • Configuration Examples for NetFlow BGP Next Hop Support, page 7 • Additional References, page 8 • Feature Information for NetFlow BGP Next Hop Support, page 9 Americas
    [Show full text]
  • IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Release 2
    IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Release 2 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]
  • IP Addressing: ARP Configuration Guide, Cisco IOS Release 15M&T
    IP Addressing: ARP Configuration Guide, Cisco IOS Release 15M&T Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    [Show full text]