ccna crash course

ccna crash course

Router-id 4.4.4.4 10.1.23.3 [MPLS: Label 300 Exp 0] 4 msec 0 msec 4 msec TE 's policy routing is no different from traditional policy routing,ccna crash course, and it does not change the routing table traffic forwarding based configuration policy. Record Route: NONE Type 1 length 8 : IGP metric: 1 [Note] Label behavior of Frame Mode We see that there are two layers of labels here. Therefore, R2 pushes the original IP packet into a layer of VPN label 505 and pushes in two layers of labels 305 403 . It is noted here that the label 403 is the LDP label assigned by R4 with the prefix 5.5.5.5/32 , which is passed to R2 through the targeted LDP connection . And 305 is the label that R3 assigns to the TE tunnel through RSVP . Attribute tag and affinity attribute The IETF is working hard to develop a 3- step process for point-to-point links only by implementing a 3- step adjacency on the broadcast link. Network 10.1.34.3 0.0.0.0 area 1 Each transport layer entity is assigned an NSAP address. The NSAP address is the network layer address of the CLNS packet . It is used to identify the device. It consists of an initial domain part ( IDP ) and a domain-defined part ( DSP ). These two parts are detailed below, let us understand this. Ip cef In an actual environment, MPLS TE is often deployed only in a few core nodes . The edge node cannot sense the existence of the TE tunnel and can only select routes according to the traditional IGP . TE headend router tunneling according TE calculated database TE optimal path of the tunnel, and with reference to the bandwidth constraints. In addition, the optimal path can also be defined by an explicit path option that the user configures on the tunnel interface. In either case, the headend router knows the specific path used by the TE tunnel. Interface Ethernet0/1 Metric , the tunnel 's Metric (for OSPF for the tunnel mouth Default cost = 1000 ) will link status information together with the notice to other neighbors, and also affects other routers routing. For a router that supports IPv6 , the algorithm for performing load balancing on MPLS packets is as follows: Ip address 1.1.1.1 255.255.255.255 Network 10.1.23.2 0.0.0.0 area 0 Holding timer : Hold time, default 30S Initial database synchronization is performed before the adjacency is formed Protocols support 10.1.23.0/24 Ip cef R1#traceroute 4.4.4.4 Tunnel mpls traffic-eng autoroute metric 32 Ip cef Tunnel mpls traffic-eng path-option 10 dynamic lab environment Sub Pool Tunnel mpls traffic-eng path-option 10 explicit name R3R4 *Aug 18 09:06:02.699: Setup Prio: 7, Holding Prio: 7 The port in TCP/IP . 2.0.0.0/24 is subnetted, 1 subnets LSP Tunnel R1_t0 is signalled, connection is up Dynamic Hostname Exchange Mechanism for IS-IS Router-id 2.2.2.2 Unmarked / No Label: The entire label stack is removed and the message is forwarded in an unlabeled manner. Status TLV Then just fill in the configuration on R2 . I won't go into details here. The maximum reservable bandwidth is obviously the bandwidth that can be used by the TE in the link. It can be configured through the ip rsvp bandwidth command. I/E Local LDP Identifier: OSPF The Global Pool Sub Pool !! interface is the bandwidth pool for each priority tunnel ! i ia 10.1.24.0 [115/148] via 10.1.123.2, FastEthernet0/0 3.3.3.0/24 3 10.1.23.2 [MPLS: Label 203 Exp 0] 964 msec 1124 msec 1008 msec R2 (config-keychain)#exit C 1.1.1.0 is directly connected, Loopback0 10.0.0.0/24 is subnetted, 2 subnets It was dismantled and then continued to be removed. State: explicit path option 10 is active This will result in the OL bit of the LSP generated by R2 , and the result seen on R1 is this: 0/0/0 Interface eth0/0 75000 Router ospf 1 !! Activate mpls on the interface , actually activate ldp An intermediate system (which can be understood as a router) has at least one NET (up to 254 ) and the system ID must be the same. Cisco routers support up to three NET addresses by default , which can be modified using the following command: ID: path option 10 [8] Type 2 length 48: Rl , R2 , R3 , R4 running the OSPF , declaring a straight connector, and Loopback interfaces, Loopback port IP of XXXX / 32 , X After calculating the path, you need to reserve resources and distribute labels through RSVP . The RSVP path message is transmitted one hop along the calculated PATH and requests resources and labels. Then R7 will give the response and bring the label back. This tag distribution and resource reservation actions are also performed one by one. In this way, an LSP is finally established. On the point-to-point link, the neighbor uses PSNP to acknowledge the new LSP . When the source router receives the PSNP acknowledgement sent by the neighbor , it stops sending new LSPs to this neighbor . In the LAN , there is no clear PSNP confirmation. The lost LSP can be detected. If any of the LSP missing or expired, Router are to PSNP send a request form to request retransmission of the LSP .