Cisco Catalyst 6500 Supervisor 2T Architecture - Ipland

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White PaperPFC4 and DFC4The PFC4 provides hardware accelerated forwarding for packets traversing the switch. This includes forwarding forIPv4 unicast/multicast, IPv6 unicast/multicast, Multi-Protocol Label Switching (MPLS), and Layer 2 packets. Alongwith forwarding, the PFC4 is also responsible for processing a number of services that are handled during theforwarding lookup process. This includes, but is not limited to, the processing of security Access Control Lists(ACLs), applying rate limiting policies, quality of service classification and marking, NetFlow flow collection and flowstatistics creation, EtherChannel load balancing, packet rewrite lookup, and packet rewrite statistics collection.The DFC4 is a daughter card that is located on selected linecards. The DFC4 contains the same ASIC functionalblocks that are found on the PFC4. The main purpose of the DFC4 is to provide local forwarding services for thelinecard, offloading this function from the PFC4. Using DFC4s helps scale performance of the overall chassis.Without any DFC4s present in the chassis, the maximum performance of a chassis with Supervisor 2T is 60 Mpps(for IPv4 forwarding). Each DFC4 adds an additional 60 Mpps of forwarding performance to the aggregate forwardingcapacity of the chassis. All of the information written about the PFC4 below equally applies (function, scalability, andperformance) to the DFC4.The PFC4 is located on the right-hand side of the Supervisor 2T baseboard, as shown in the diagram below.Figure 7.Policy Feature Card 4 on the Supervisor 2TThe location of the DFC4 on a linecard is shown in the following diagram. In the photo below, the DFC4 is locatedunderneath a protective cover that protects the daughter card from getting damaged when the linecard is inserted orremoved from a chassis.© 2011-2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Partner Confidential Information. Page 16 of 46
White PaperFigure 8.DFC on the WS-X6908-10GE LinecardPFC4 and PFC4XL Feature ReviewThe PFC4 offers a number of enhancements and new capabilities over earlier generations of the PFC. Thesehardware feature capabilities are summarized in the following table.Table 9.New PFC4 EnhancementsFunctional AreaForwardingFeatureIncreased forwarding performance of up to 60 Mpps for L2, IPv4 and MPLS forwarding and up to 30 Mppsfor IPv6 forwardingImproved EtherChannel load balancing utilizing an 8-bit hashIncreased multicast routes to 256 KSupport for 16 K bridge domainsSupport for 128 K logical interfacesIncreased MAC address table to 128 KIGMPv3 snooping in hardwarePIM registers in hardwareIPv6 MLDv2 snooping in hardwareIPv6 in IPv6 tunnellingIPv6 in IPv4 tunnellingFull Pipe tunnel modeTunnel source address sharingNetwork SecurityCisco TrustSec (CTS) with support for RBACL (note that 802.1ae link layer encryption is a function of theport ASIC and not the PFC4)Hardware control plane policing (including multicast CoPP) and an increase in the number of hardware ratelimitersShared ACL table (with QoS) now up to 256 K entriesL2+L3+L4 ACLs1:1 mask ratio with ACE valuesACL dry run and hitless commitClassify using more fields in IP headerSource MAC + IP BindingDrop on source MAC missPer protocol per dropIpv4 and IPv6 uRPF© 2011-2012 Cisco and/or its affiliates. All rights reserved. This document is Cisco Partner Confidential Information. Page 17 of 46
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Page 4 and 5: White PaperA high-level overview of
Page 6 and 7: White PaperThe installation of the
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Page 12 and 13: White PaperFigure 4. Fabric Channel
Page 14 and 15: White PaperIts other main function
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Page 22 and 23: White PaperLayer 3 - Egress NetFlow
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Page 32 and 33: White PaperLayer 3 Feature PFC3B/PF
Page 34 and 35: White PaperPFC4 (and PFC4XL) Functi
Page 36 and 37: White PaperThe RPF processing block
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Page 40 and 41: White PaperThe rewrite info table c
Page 42 and 43: White PaperSubsequent to the Layer
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Page 46: White PaperGlossaryThe following se

Cisco Catalyst 6500 Supervisor 2T Architecture - Ipland

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