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!! Activate IS-IS on the interface Intermediate System to Intermediate System (IS-IS) Cryptographic Authentication 10.1.23.2 The sub-TLV of 0-244B is mainly used for MPLS TE. 129 Partition repair: on . 8 bits if the LSP originating router supports the repair area division is set this field Attached bits : the first 4-7 bits, for setting the LSP association with another area available with the following metrics: of . 4 -bit - default; 5th bit - delay; 6th bit - overhead; 7th bit - error R2 (config)#router isis ! 75000 Protection Link (link protection) ! Route summary example 2 on the L2 router Attribute Flags: 0x00000000 Up time: 00:00:33 Interface fast1/0 Support IP classless routing prefix (support VLSM ) DIS R1#sh mpls traffic-eng topology 1.1.1.1 InLabel : - Interface eth 0/0 Some SPFs are restricted for inter-domain and external routing, and any inter-domain link turbulence caused by smaller areas and hierarchical topology extensions leads to complete This state has three values: down ,ccna download free, init , up (Tunnel0) Destination: 4.4.4.4 CSPF ( Constrained Shortest Path First ) SPF algorithm with constraints RSVP Signalling Info: 55000 The configuration of R1 is very critical, let's focus on it: Ip address 10.1.34.3 255.255.255.0 IP 1.1.1.0 255.255.255.0 IS R3.02 Outgoing Src 2.2.2.2, Dst 4.4.4.4, Tun_Id 0, Tun_Instance 6 RSVP Path Info: Tspec: ave rate=60000 kbits, burst=1000 bytes, peak rate=60000 kbits RSVP Resv Info: Explicit Route: 10.1.12.2 10.1.23.2 10.1.23.3 10.1.34.3 L1 (inside the area) and L2 (in the area) 4.4.4.4/32, version 12, epoch 0, cached adjacency 10.1.12.2 Outgoing interface 10.1.12.2 Mpls ip Remarks 5.5.5.5 LDP discovery sources: 0 kbits/sec 303 Frame-relay map ip 10.1.123.3 301 broadcast frame-relay map clns 301 broadcast 0x2F89 For all practical applications, IS-IS only supports broadcast and point-to-point links. The NBMA link is not supported . In the NBMA environment, it can be equipped Then R1 will use the IGP of Metric , and ignore R2 on the configuration of the physical interface adminnitration-weight , so after the entry into force of the above command, go R1 view on the tunnel 's path weight , it turned into a 3 . R3 is the ABR , connected area0 and area1 Tag 102 !! Bandwidth requirement is 20M , tunnel preemption priority and retention priority is 7 Net 49.0001.0000.0000.0002.00 MPLS VPN configuration 0x0000000C Age Interface Tunnel0 We see that after the BGP neighbor relationship is up , R2 immediately triggers an LSP , and the overload is set before the LSP is cleared . First configure R3 : A copy of the LSP to initiate a cleanup process. This method effectively ensures that other routers in the network clear the corrupted LSP . The corrupted LSP does not participate in the route calculation, and of course it will not be flooded in the network. OSPF Bandwidth information Ip unnumbered loopback 0 tunnel destination 4.4.4.4 tunnel mode mpls traffic-eng C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/24 is subnetted, 1 subnets Uptime: 9 minutes, 33 seconds Selection: reoptimation Net 49.0003.0000.0000.0005.00 Name: R1_t0 Status: Frame-relay map ip 10.1.123.1 301 broadcast Ip cef Router isis Maximum bandwidth : 12500000 Network 10.1.12.1 0.0.0.0 area 0 The term circuit ( Circuit ) corresponding to the interface . Because the NET address is used to identify the entire device, the Circuit ID is used to indicate a different interface. The router assigns a 1- byte Circuit ID to the interface as follows . It is only possible to establish adjacencies with neighboring routers at the same level. However, not all messages with the same label belong to one FEC , because the EXP values ​​of these messages may be different and may be performed differently, so they may belong to different FECs . Next-address 10.1.24.4 If it is a Frame Relay P2P sub-interface, then there will be no problem, this is the recommended deployment method. Prefix Remote binding: tsr: 2.2.2.2:0, tag: imp-null 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 .