3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 5 Integrated IS-IS Configuration3Com Corporation5-24Operation CommandDisplay LSDB of IS-IS display isis lsdb [ l1 ] [ l2 ] [ level-1 ][ level-2 ] [ local ] [ verbose ] [ LSPID ]Display SPF calculation logs of IS-IS display isis spf-logDisplay IS-IS routing information display isis routingDisplay IS-IS peer information display isis peer [ verbose ]Display information about mesh group display isis mesh-groupEnable IS-IS debuggingdebugging isis { adjacency | all |authentication-error | checksum-error| circuit-information |configuration-error |datalink-receiving-packet |datalink-sending-packet |general-error | interface-information |memory-allocating |receiving-packet-content |self-originate-update |sending-packet-content | snp-packet |spf-event | spf-summary | spf-timer |task-error | timer | update-packet }Disable IS-IS debuggingUndo debugging isis { adjacency | all |authentication-error | checksum-error| circuit-information |configuration-error |datalink-receiving-packet |datalink-sending-packet |general-error | interface-information |memory-allocating |receiving-packet-content |self-originate-update |sending-packet-content | snp-packet |spf-event | spf-summary | spf-timer |task-error | timer | update-packet }5.4 Integrated IS-IS Configuration ExampleI. Network requirementsAs is shown in the following figure, Routers A, B, C and D belong to the sameautonomous system. The IS-IS routing protocol is run in these four routers so as toimplement route interconnection. In the network design, Routers A, B, C and D belongto the same area.