TAILIEUCHUNG - The Complete IS-IS Routing Protocol- P33

The Complete IS-IS Routing Protocol- P33: 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. | 310 12. IP Reachability Information New-York show running-config . this is the interface to the RIP router interface FastEthernet0 0 ip address router rip network router isis net redistribute rip metric 8 . New York s LSP looks in the tcpdump packet trace as follows Tcpdump output A redistributed RIP route shows up in the LSP as an IP External Reachability TLV 14 48 OSI IS-IS length 405 L2 LSP hlen 27 v 1 pdu-v 1 sys-id-len 6 0 max-area 3 0 lsp-id seq 0x000002fd lifetime 1198s chksum 0xe984 correct PDU length 405 Flags L1L2 IS . IP External reachability TLV 130 length 12 IPv4 prefix 16 Default Metric 8 Internal Distribution up IS Reachability TLV 2 length 67 IsNotVirtual IS Neighbor Default Metric 10 Internal IS Neighbor Default Metric 10 Internal . You can also spot the IP External TLVs by looking into the isis database using the show isis database command. IOS command output The bold marked output represents the content transported using the IP External Reachability LSP which can be displayed using the show isis database command. Amsterdam show isis database verbose . IS-IS Level-2 Link State Database LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT P OL 0x00000762 0x6467 732 0 0 0 NLPID 0xCC 0x8E Old-style IP Reach RFC 1195 Information 311 Area Address IP Address Metric 10 IS Metric 10 IP-External In JUNOS the external prefixes can be spotted at two places of the show isis database extensive command line output. JUNOS command output JUNOS yields information at two places of the show isis database command line output. First at the LSP Overview Section next to LSP-Name Sequence Number Checksum and Lifetime Information and then in the detailed TLV Breakdown. hannes@olive-2 show isis database extensive . IS-IS level 2 link-state database .

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