The Complete IS-IS Routing Protocol- P19:IS-IS has always been my favourite Interior Gateway Protocol. Its elegant simplicity, its well-structured data formats, its flexibility and easy extensibility are all appealing – IS-IS epitomizes link-state routing. Whether for this reason or others, IS-IS is the IGP of choice in some of the world’s largest networks. Thus, if one is at all interested in routing, it is well worth the time and effort to learn IS-IS. | Index 533 Weaknesses in ISIS 353 BGP and 274-276 481-482 Cisco 6 Common header 110 Configuration Basic 66-68 IOS 451 JUNOS 452 Configuration examples see Configuration examples Database 142-143 433 see also Link-state database Defined 1 DIS 113 188 see also DR And psuedonodes183 Election 173 199 ID JUNOS 201-202 Pre-emption 200 Priority 199-200 Redundancy 202 Distribution of prefixes 329-331 Encapsulation 81 SNAP 231-232 Extended fragmentation 518-520 Extensibility 5 289-291 Extensions 345 Flooding and TED 436 Full Internet routes 469 Future of 503 G-MPLS extensions 513-518 Graceful restart 388-389 IETF and 6 Interface 80 Intergration with IP 5 IOS commands for see Commands IOS IP addresses and 102-103 IPv6 370 JUNOS commands for see Commands JUNOS LDP and 421 Levels 8-level ISIS 513-518 Defined 85 L1 85-87 112 142 144 155 240 331 L1L2 85-87 112 115 156 159 240 331 339 L2 85-87 112 143-144 146 155 240 331 Recommendations 493-494 Liveliness 135-136 LSDB 141-142 433 see also Link-state database LSPs see LSPs MAC addresses and 80 Messages Common header 110 Hello 109-110 LAN hello 111 P2P hello 114 Metrics 14 193 267 294-295 301 Auto-bandwidth 320 Auto-calculation of 319-320 And traffic engineering 393 Interworking issues 327 Example 250-253 New-style 318 Old-style 301-302 304-205 327 Static 320-322 Wide 304 318 408 MTU size 82 230-232 Checking 116 Issues 230-232 Multi-topology 379 Neighbor liveliness detection 135-136 NETs 92-93 100 On NSFNet 3-4 Origin of 2-4 OSI-RM and 79-80 Overload bit 154 156-157 159 Application 159-160 Fragments and 244 Setting 161-163 Use recommended 499 Padding 116 234-235 Private addresses 103-104 Pseudonode 153 183 186-187 301 And SPF calculation 254-256 Representation 188 Suppression of P2P 196 System-ID selection 191-193 PSNP 208 218 236-238 And authorization 365 Purging LSPs 172-175 Expiration of 174 Route leaking ISIS 87-90 Level 1 to Level 2 337 Level 2 to Level 1 331-334 534 Index ISIS cont d Route resolution 247 273-276 Routing
