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*Aug 18 09:06:07.919: version=0 length in words=10 Point1 : !! TE tunnel IS-IS Level-1 Link State Database: Such as LDP ID = 1.1.1.1:0 Eventually this tagged package with 403 and 505 is sent to the TE Tunnel , so: Mpls traffic-eng tunnels ip rsvp bandwidth Delay metric is optional, the link transmission delay is not supported. By default TE metric equal to the IGP Metric (This means that, without using the above command interface disposed in the physical, TE metric equal to the IGP Metric ) *Aug 18 09:06:02.699: 10.1.24.4 (Strict IPv4 Prefix, 8 bytes, /32) 0 kbits/sec ! ! The interface of each router activates RSVP and MPLS TE tunnel support. Tib entry: 1.1.1.1/32, rev 2 Local binding: tag: 100 ( ... omit... ) Et0/1 Down Thresholds: 100 99 98 97 96 95 90 85 80 75 60 45 30 15 Look again, now looking at the traffic with the source of 10.1.35.55 for 1.1.1.1 , we found that R3 uses another equivalent path, that is, it goes out from the F0/0 port. This is based on the meaning of the source address pair. *Aug 18 09:06:02.699: version=0 length in words=10 ATT/P/OL OSPF only has LSA scalability, and LSA scalability is too poor. In this environment, since the tail end of the tunnel is at R4 , the label that R4 assigns to this tunnel through RSVP is POP . SENDER_TEMPLATE Interface Serial0/1 *Aug 18 09:06:07.919: 10.1.24.2 (Strict IPv4 Prefix, 8 bytes, /32) *Aug 18 09:06:02.699: Controlled Load Service break bit=0 service length=0 10.1.23.3 Three tables This will result in the OL bit of the LSP generated by R2 , and the result seen on R1 is this: TE Metric : Administrative weight In this way , we can exchange visits between 5.5.5.5 and 6.6.6.6 , on R6 . In a broadcast multi-access network, a router is elected as a DIS , and a peer-to-peer network does not require a DIS. Mpls traffic-eng tunnels ip rsvp bandwidth 10.1.34.0/24 Overview CSPF maximum arbitration Level1 area IS-IS level2 to OSPF Ip address 5.5.5.5 255.255.255.255 For Level1 router , the area number is required to be the same. R3.00-00 Router isis Refresh Period (msec): 30000 Traffic using traffic engineering uses source-based routing instead of routing based on destination IP address Net 49.0003.0000.0000.0005.00 Type block This is 1B , which contains a number of important bits: Link[0 ]:Nbr IGP Id: 10.1.12.2, nbr_node_id:8, gen:47 frag_id 0, Intf Address:10.1.12.1 Redistribute connected level-1 Comment Basic principles for establishing IS-IS adjacency relationships Ip address 2.2.2.2 255.255.255.255 description Locally assigned labels are distributed to neighbors, and if there are multiple connections to a single neighbor, the label is valid on all connections. Then regardless of local Priority 1 : 9375000 Network Services Access Points R1#deb ip rsvp dump-messages 3.3.3.3 [110/65537] via 10.1.12.2, 00:00:47, FastEthernet0/0 The above is the debug information under normal circumstances . Bw[6]: 101 Next Hop R2#sh mpls tr link-management advertisements Priority 0 : 9375000 Tunnel mpls traffic-eng autoroute metric relative parsing if the configuration of R2 changes as follows: R1 goes from R2 and then goes to tunnel . The cost of this path is cost=10+1+1=12 R1(config)#interface fa0/0 Of course, the above method is not safe. Therefore, in special cases, we may want the L1\L2 router to conditionally set the ATT bit and set it more controllable. Then we can associate the route-map and match a specific one in the route-map . Routing, as long as this route is in my routing table, route-map is satisfied, I will set ATT . Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Tunnel mpls traffic-eng autoroute announce Next , take a look at the Tunnel on R1 : Network 10.1.34.4 0.0.0.0 area 0 Label 3 implicit null label 10.1.23.0/24 Fa0/0 Label Space ID is generally 0 , indicating that our label is a platform - based ( Per-platform ) label space. Test . 3 : SET-overload 'bit-ON-120 Startup *Aug 18 11:26:02.546: 75000 Two modes: frame mode ; ATM mode ( cell mode ), we mainly study frame mode Router-id 3.3.3.3 75000 All Layer 2 routers must have a unique system ID within the domain OSPF supports the following network types: P2P , broadcast, NBMA , point-to-multipoint, and on-demand circuits Mpls traffic-eng router-id Loopback0 mpls traffic-eng area 0 R1.00-00 4.4.4.4/32 ! Note: To use the above command to complete conditional notifications, you need to use no mpls ldp advertise-labels first . Otherwise, the LSR advertises all label bindings. 75000 I don't want L1-router to generate this default route, or more rigorously, we don't want L1\L2 router to press att , the method is Network 10.1.34.3 0.0.0.0 area 0 mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 In the LSP , and if the LSP is divided into different segments, then the TLV word OSPF Router with ID (2.2.2.2) (Process ID 1) Router Link States (Area 0) *Aug 18 04:37:06.239: SENDER_TEMPLATE type 7 length 12: Flowspec 301 *Aug 18 11:26:02.546: SESSION Terminal system ES Label location Tunnel mpls traffic-eng autoroute metric relative parsing if the configuration of R2 changes as follows: This can be area at any level within the router adjacency relationship; may be other area adjacent L2 or L1 / L2 router forming L2 Explicit Path a series of IP configuration, an explicit path in the IP can be an interface IP , it may be MPLS TE Router ID . 0 kbits/sec The agreement was released as RFC1195 . The configuration of R1 is very critical, let's focus on it: The default flooding period of OSPF is 30 minutes. You can modify it by timers pacing lsa-group. 10.1.12.2 The two important thresholds in the LSP remaining time field are: LSP maxage and LSP refresh interval We can avoid this problem by using overload-bit . The command is explained as follows (configured under the router isis process): *Aug 18 09:06:07.919: SESSION type 7 length 16: Next Hop Ip address 10.1.34.4 255.255.255.0 The IS-IS adjacency on the LAN is still different from the P2P link: The configuration of R2 is as follows: 203 TOS 0 Metrics: 1 8bit maximum 255 , usually in the labeling when it is the ordinary ip packet TTL direct copy came After the configuration is complete, the tunnel is up. Interface Loopback0 In a typical network design, multiple independent Level1 areas are connected through a backbone network, and the backbone network is composed of routers with Level 2 routing functions. The Level1-2 router has two independent link state databases that support Level1 and Level2 routing , respectively . Network 10.1.12.1 0.0.0.0 area 0 42000 Global Pool Like the above figure, it is very easy for traffic to go unilaterally. The R1-R3-R4-R5 link does not carry traffic. It may be possible to adjust the link such as cost to make the following link available. The method may bring problems to other traffic while adjusting. In general, the IP traffic engineering guides the traffic to a relatively simple one. It is nothing more than the ospf protocol that manipulates the cost by using the characteristics of the protocol itself, or manipulates the path attributes like BGP ,ccna voucher, or through policy routing. Control.