I

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ICMP (Internet Control Message Protocol)
     ACLs
     echo packets, tracing
     Echo Request/Reply messages
     redirect packets
     Router Advertisement packets
     Router Selection packets
ICMPv6 header format
identifying IPv6 address types
IGPs (Interior Gateway Protocols)
IGRP (Interior Gateway Routing Protocol)
     default timers, modifying
     delay
     holddown
     load
     metrics
         modifying
     process domains
     redistribution into RIP, configuring
     reliability
     similarities to RIP
    timers
         90-second
         sleeptime
Implicit Acknowledgments
implicit acknowledgments
implicit deny any filter
improving SPF efficiency on IS-IS networks
InfTransDelay
Init state (OSPF neighbors)
input events
     for OSPF interface state machine
     for OSPF neighbors
inter-area paths
Inter-Area Prefix LSAs
Inter-Area Router LSAs
inter-area summarization
inter-area traffic
Inter-Domain Routing Protocol Information TLV
Interface ID
interface state machine (OSPF)
     input events
interface-specific summarization
interfaces, OSPF
     data structure
     input events
     states
interior routes
Intermediate System Neighbors TLV
internal routers
internal routes
Internet layer (TCP/IP)
internetwork IP addresses
intra-area paths
Intra-Area Prefix LSAs
intra-area traffic
Intradomain Routing Protocol Discriminator
invalid timers
     IGRP
     RIP
invalid updates, sources of
inverse masks
ip access-group command
ip accounting access-violations command
ip address command 2nd
IP Address field
     RIP
     RIPv2
IP addresses
     bitcount format
     dotted decimal format
     dotted-decimal format
     first octet rule
     hexadecimal format
     internetworks
     masks
     prefix lists
     reverse ARP
     RIP
     subnet masks, troubleshooting
     subnets 2nd
         designing
     summary routes
ip cef command
ip classless command 2nd
ip default-network command 2nd
IP External Reachability TLV
     U/D bit
IP External Routes TLV
IP Interface Address TLV
IP Internal Reachability TLV
     U/D bit
IP Internal Routes TLV
ip load-sharing
ip load-sharing command
ip load-sharing per-packet command
ip netmask-format
ip netmask-format command 2nd
ip ospf cost command
ip ospf dead-interval command
ip ospf priority command
ip ospf transmit-delay command
IP packets
     flags
     Fragment Offset field
     Header Checksum field
     header length
     identifiers
     Options field
     Protocol field
     TOS (Type of Service)
     total length
     TTL (Time to Live) field
     versions of
ip policy route-map command 2nd
ip proxy-arp command 2nd
ip redirects command
ip rip triggered command
ip route command
ip route-cache command
ip router isis command
IP-specific TLV fields
IPv4
     configuring on IS-IS
     depletion of
     static routes, configuring
IPv6
     address representation
     anycast addresses
     configuring on IS-IS
     default-information originate command, default route configuration
     double colon representation
     embedded IPv4 addresses
     extension headers
     failed routes, tracing
     floating static routes
     global unicast addresses
     identifying address types
     local unicast addresses
     modifying static entries on replaced routers
     multicast addresses
     NDP
         address autoconfiguration
         Duplicate Address Detection
         messages
         Neighbor Address Resolution
         Neighbor Unreachability Detection
         privacy addresses
         router discovery
     need for
     packet header format
     prefixes
     redistribution with route tags
     RIPng
         configuring
         next-hop route entries
         route summarization
     route filtering
     routing with IS-IS
     static routes, configuring
     unspecified addresses
ipv6 cef command
ipv6 nd prefix command
IPv6 Prefix field (RIPng messages)
ipv6 route command
ipv6 unicast-routing command
IS (intermediate system)
IS-IS (intermediate System-to-Intermediate System)
     adjacencies
         troubleshooting
     areas
     authentication, configuring
    extensions
         3-way handshaking
         domain-wide prefix distribution
         Dynamic Hostname Exchange
         IPv6 routing
         mesh groups
         Multi Topology routing
         wide metrics
     flooding delay
         controlling
     IPv4, configuring
     IPv6, configuring
     layered network architecture
         subnetwork dependent functions
         subnetwork independent functions
    link-state database
         displaying
         troubleshooting 2nd
     LSPs
         fields
         Inter-Domain Routing Protocol Information TLV
         Intermediate System Neighbors TLV
         IP External Reachability TLV
         IP Internal Reachability TLV
         TLVs
     multiple area addresses, configuring
     multiple L1 areas, configuring
     multiple topology mode, configuring
     neighbor table, displaying
     NETs
         format
         selecting
     on NBMA networks, troubleshooting
    PDUs
         format
         header fields
         Hello PDU format
         Hello PDUs
         IS-IS LSPs
         IS-IS Sequence Number PDU format
         TLV fields
     redistribution into RIP/RIPng
     route leaking, configuring
     route summarization, configuring
     router types, configuring
     similarities with OSPF
     SNPs
     SPF efficiency, improving
     System ID
     troubleshooting
     virtual link support
IS-IS Sequence Number PDUs
     LSP Entries TLV
isis lsp-interval command