Enterprise QoS Solution Reference Network Design Guide

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Summary Summary References Standards Books 4-22 Enterprise QoS Solution Reference Network Design Guide Chapter 4 Branch Router QoS Design Although the QoS design recommendations for branch routers are very similar to and are related to the QoS recommendations for WAN aggregators, this chapter examined four unique considerations of branch routers. The first consideration was whether to define policies manually or automatically, via the AutoQoS—Enterprise feature. AutoQoS— Enterprise can automatically detect and provision bandwidth for up to 10 classes of traffic and is well suited to smaller WAN/Branch networks managed by administrators with moderate QoS expertise. However for larger WAN/Branch networks, where centralized policies are generally preferred, this feature may not be appropriate due to its limitations. The second consideration is whether applications provisioned over the WAN are bidirectional or unidirectional. Some unidirectional applications, such as Streaming-Video, provisioned on the WAN aggregator WAN edge do not need to be provisioned correspondingly on the branch router’s WAN edge. Bandwidth from unidirectional application classes can be redistributed among other preferential application classes on the branch router’s WAN edge. The third consideration unique to branch routers is that ingress marking might need to be performed on branch-to-campus traffic. This might be because the remote branch access switch does not have the capability to classify and mark traffic, or it might be because some applications require stateful packet inspection (NBAR) to identify them correctly. In either case, ingress marking policies would be required on the branch router’s LAN edge, on the data VLAN’s subinterface (the voice VLAN traffic markings are trusted). Branch-to-campus traffic can be identified by Layer 3 parameters (such as destination subnet), Layer 4 parameters (such as well-known TCP/UDP ports), or NBAR PDLMs. An example of each type of classification is provided. Additionally, optional DSCP-to-CoS mapping policies (for restoring 802.1p CoS markings that were lost when campus-originated traffic traversed the WAN media) can be set on the branch router’s LAN edge. A fourth unique consideration in branch QoS design is that branch router ingress LAN edges are a strategic place to deploy NBAR policies for worm identification and policing. NBAR policies can be used to identify and drop Code Red, NIMDA, SQL Slammer, RPC DCOM/W32/MS Blaster, Sasser, and other worms. This chapter discussed an extension of the NBAR feature that enables administrators to program the strings that they want NBAR to search packet payloads for; this feature enables NBAR policies to be used to identify new worms that undoubtedly will be released in the future. RFC 2474 “Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers” http://www.ietf.org/rfc/rfc2474 RFC 2597 “Assured Forwarding PHB Group” http://www.ietf.org/rfc/rfc2597 RFC 3246 “An Expedited Forwarding PHB (Per-Hop Behavior)” http://www.ietf.org/rfc/rfc3246 Szigeti, Tim and Christina Hattingh. End-to-End QoS Network Design: Quality of Service in LANs, WANs and VPNs. Indianapolis: Cisco Press, 2004. Version 3.3
Chapter 4 Branch Router QoS Design Cisco IOS Documentation Cisco SAFE Whitepapers Version 3.3 Enterprise QoS Solution Reference Network Design Guide References Class-based marking (Cisco IOS Release 12.1.5T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121newft/121t/121t5/cbpmark2 .htm Enhanced packet marking (Cisco IOS Release 12.2.13T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftenpkm k.htm NBAR overview (Cisco IOS Release 12.3): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt1/qcfclas s.htm#1003102 Network-Based Application Recognition (Cisco IOS Release 12.1.5T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fqos_c/fqcprt1/qcfnbar .htm Network-Based Application Recognition (Cisco IOS Release 12.2.8T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad. htm Network-Based Application Recognition (Cisco IOS Release 12.3[4]T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t8/dtnbarad. htm AutoQoS for the Enterprise (Cisco IOS Release 12.3[11]T): http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123newft/123t/123t_11/ft_aqos e.htm SAFE worm mitigation: http://www.cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_solutions_white_paper 09186a00801e120c.shtml Using Network-Based Application Recognition and ACLs for blocking the Code Red worm: http://www.cisco.com/en/US/products/hw/routers/ps359/products_tech_note09186a00800fc176.sh tml How to protect your network against the NIMDA virus: http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080110d17 .shtml SAFE SQL Slammer worm attack mitigation: http://www.cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_solutions_white_paper09186 a00801cd7f5.shtml SAFE RPC DCOM/W32/Blaster attack mitigation: http://www.cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_solutions_white_paper 09186a00801b2391.shtml Combating the Internet worm Sasser: http://www.cisco.com/application/pdf/en/us/guest/netsol/ns441/c664/cdccont_0900aecd800f613b. pdf 4-23
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