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lab environment FastEthernet0/0, Src IP addr: 10.1.12.2 Addresses bound to peer LDP Ident: Local tag Network 10.1.45.4 0.0.0.0 area 0 IS-IS packets are encapsulated in data link layer frames. 10.1.12.2 Interface Used to request complete LSP information when the database is synchronized on the broadcast link. IS-IS metric Note that at this moment, 2.2.2.0/24 will not be learned on R4 . This external route is completely suppressed on R2 . Circuit type : 01 means L1 router, 10 means L2 router, 11 means L1/2 router *Aug 18 09:06:07.919: Ciphertext LSPs authentication ( Level1 ) The configuration of R1 is as follows (other basic configurations are omitted directly): MOSPF extension provides support for IP multicast routing 10.1.23.2 2.2.2.2/32, Flags: 0x21 (Local Prot Avail/to NHOP, Node-id) 1 *Aug 18 11:26:02.546: Oldtime Circuit Id R3#sh mpls forwarding-table lab environment Packets with the same processing mode according to the process or IP DSCP field R1(config-keychain)#exit Based (internet per-Platform ) compared to the label space-based interface ( per-interface ) security label space to lower R1#traceroute 55.55.55.55 This will directly cause R1 to select the nearest exit from R2 and R3 , and generate a default route to point to this exit. Since this experiment, the cost of R2 , R3, etc. , there are two defaults in R1 's routing table. Route load balancing. This default, automatic mechanism is a benefit for the level1 area because it can reduce the routing table and provide a way to go out, but it also poses a problem, for example, if R2 or R3 is connected to the backbone . If the link DOWN is gone,ccna book free download, will R1 still stupidly throw the packet to R2 or R3 ? Fortunately, in the new CISCO IOS , IS-IS is optimized: under normal circumstances, R2 and R3 will flood the 49.0001 area.