ccna tutorial pdf

ccna tutorial pdf

! System Id Type Interface IP Address State Holdtime Circuit Id Tunnel mpls traffic-eng path-option 10 dynamic The initial environment is as shown above,ccna tutorial pdf, and the traffic from R1 to R8 has been carried on the green path shown in the figure. The main function of the ES-IS protocol is to provide mapping of NSAP addresses to SNPA addresses for network devices . Pop Label Type-10 Opaque Link Area Link States (Area 0) Looking at the above topology, we need to establish a TE tunnel between R1 and R5 . Under normal network conditions, we want the tunnel path to be R1-R2-R5 , which is an explicit specified path. In order to make the tunnel path have a backup, we can define a path-option , this path uses the dynamic setting method, let CSPF calculate it by itself, then the configuration is as above. Mpls traffic-eng router-id loopback 0 mpls traffic-eng level-1 Each IP packet forwarded to a router is the same before and after being forwarded through the router. Remote binding: tsr: 2.2.2.2:0, tag: imp-null Route-target export 2345:2 MP ( Merge Point ): Convergence point, which is the end of the backup tunnel. It can also be understood as the junction point of the primary tunnel and the backup tunnel. SENDER_TEMPLATE Address-family vpnv4 neighbor 2.2.2.2 activate *Mar 1 00:00:32.759: ISIS-Upd: Important fields changed i L2 Path: valid If the link flaps, the LDP session will be re-established, and the label bundle must be exchanged again . It is very inefficient to rebuild the LDP session. We can protect the session and implement LDP session between the two directly connected LSRs . After the protection, a destination-based LDP session is established between the two LSRs , that is, the target LDP session . When the direct link between the two LSRs is DOWN , as long as there exists between the two LSRs .