TAILIEUCHUNG - The Complete IS-IS Routing Protocol- P46

The Complete IS-IS Routing Protocol- P46: 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. | 452 15. Troubleshooting Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 Nov 20 18 47 restart RR reset RA reset holdtime 0 1386 bytes of total padding checksum 0x6b7f Rebuilding L1 fragment sequence 0x69 Rebuilding LSP free bytes 1320 Next type 1 estimated free bytes 1455 free bytes 1455 Next type 12 9 estimated free bytes 144 9 free bytes 1449 Next type 134 estimated free bytes 1445 free bytes 1445 Next type 137 estimated free bytes 1433 free bytes 1433 Next type 22 estimated free bytes 1424 free bytes 1424 Next type 128 estimated free bytes 1353 free bytes 1353 IP TLVs generated used 29 bytes Rebuilt L1 fragment size 168 After acquiring an understanding of what the network is doing wrong perhaps the prerequisite for further troubleshooting is to know what the network is supposed to do. As such you need to know where the router keeps IS-IS-related configurations and how to modify them. Configuration File The IS-IS-related configuration is scattered across many places in a router configuration. There is interface related configuration router process related configuration authentication information and finally routing-policies route-maps and access-lists that deal with prefix exchange with other protocols. In IOS most of the relevant IS-IS configuration is accommodated in the router isis and interface section. Authentication information key chains is present in the top level context and policies are defined as route-maps. In the configuration output below you can see an example of a full-blown IOS IS-IS configuration. IOS configuration In the IOS configuration most command parameters are set in the interface and router isis command hierarchy. Policies are defined inside .

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