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    Ebook Cisco ISP Essentials

    By admin | May 30, 2014

    Tagged with:

    image

    LIST OF FIGURES
    Figure 1 – IOS Roadmap………………………………………………………………………………………………………………………………………………………16
    Figure 2 – Tailing a Centralised syslog file for a Cisco Router ……………………………………………………………………………………………24
    Figure 3 – Typical Internet POP Built for Redundancy and Reliability using the core routers as NTP servers……………………28
    Figure 4 – Netflow in it’s capacity planning role. …………………………………………………………………………………………………………………45
    Figure 5 – ISP’s Security Threats come from all Directions…………………………………………………………………………………………………49
    Figure 6 – Command Auditing on the Router via Cisco Secure and TACACS+ …………………………………………………………………59
    Figure 7 – Router Authentication…………………………………………………………………………………………………………………………………………61
    Figure 8 – How Routing Protocol Authentication Operates …………………………………………………………………………………………………62
    Figure 9 – Ingress and Egress Filtering ………………………………………………………………………………………………………………………………..64
    Figure 10 – URLs to the RIR’s Default Allocation Sizes ……………………………………………………………………………………………………..68
    Figure 11 – Standard Access List – Incoming Packets …………………………………………………………………………………………………………70
    Figure 12 – Extended  ACLs – Logical Flow for Every Packet ……………………………………………………………………………………………71
    Figure 13 – Turbo ACLs  – Processing takes five steps no matter what the size …………………………………………………………………..72
    Figure 14 – Turbo ACL’s Performance Consistency…………………………………………………………………………………………………………….72
    Figure 15 – Egress Packet Filtering on the Upstream Gateway Router………………………………………………………………………………..73
    Figure 16 – Egress Packet Filtering on the Customer Edge………………………………………………………………………………………………….74
    Figure 17 – Ingress Packet Filtering on the Upstream Gateway Router……………………………………………………………………………….75
    Figure 18 – Ingress Packet Filtering on the ISP « Customer Edge (IETF BCP Recommendation)……………………………………76
    Figure 19 – Using static host routes to null 0 for black list filtering …………………………………………………………………………………….77
    Figure 20 – Unicast RPF validating IP source addresses ……………………………………………………………………………………………………..78
    Figure 21 – Unicast RPF dropping packets which fail verification………………………………………………………………………………………78
    Figure 22 – Unicast RPF Drop Counter ……………………………………………………………………………………………………………………………….80
    Figure 23 – Unicast RPF applied to Leased Line Customer Connections…………………………………………………………………………….84
    Figure 24 – Unicast RPF applied to PSTN/ISDN Customer Connections……………………………………………………………………………84
    Figure 25 – Multihomed Lease Line Customer & Unicast RPF …………………………………………………………………………………………..85
    Figure 26 – Enterprise Customer Multihomed to two ISPs ………………………………………………………………………………………………….88
    Figure 27 – Enterprise Network using Unicast RPF for Ingress Filtering…………………………………………………………………………….89
    Figure 28 – Multi-Homed Enterprise Networks …………………………………………………………………………………………………………………..90
    Figure 29 – How asymmetrical routing would not work with Unicast RPF…………………………………………………………………………91
    Figure 30 – How SMURF uses amplifiers ……………………………………………………………………………………………………………………………94
    Figure 31 – Dual gateway LAN……………………………………………………………………………………………………………………………………………97
    Figure 32 – BGP Route Reflector Cluster…………………………………………………………………………………………………………………………..110
    Figure 33 – BGP Route Reflector Cluster with two RRs ……………………………………………………………………………………………………111
    Figure 34 – BGP Route Flap Damping……………………………………………………………………………………………………………………………….114
    Figure 35 – BGP Conditional Advertisement – Steady State……………………………………………………………………………………………..127
    Figure 36 – BGP Conditional Advertisement – Failure Mode ……………………………………………………………………………………………128
    Figure 37 – Network Used for Configuration and Filtering Sample …………………………………………………………………………………..143
    Figure 38 – ISP Network Example ……………………………………………………………………………………………………………………………………..179
    Figure 39 – Applying Anti-Spoofing Filters……………………………………………………………………………………………………………………….180
    Figure 40 – Closing off access to everyone except the NOC Staff ……………………………………………………………………………………..182

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