global knowledge ccna

global knowledge ccna

! 10.1.12.2 Reservable Bandwidth[2]: For example, in the above topology, R1 establish a to R4 of TE the Tunnel , all routers have declared their loopback into OSPF . All interfaces cost are 1 . CSNP Interface Loopback0 0 kbits/sec Ip address 2.2.2.2 255.255.255.255 TE metric: 1 Fa1/0 0x26DC Maximum reservable bandwidth information: The LSP is set by ATT . Take R2 as an example. If the S1/0 port of R2 is DOWN , it loses the connection of Backbone , so R2 Interface Tunnel0 Which table is specifically checked depends mainly on the Layer 2 encapsulation of the received data. For example,global knowledge ccna, if the Layer 2 encapsulation is Ethernet (data frame), look at the value of the Type / Length field of the frame header : RSVP Signalling Info: Mpls traffic-eng router-id loopback0 mpls traffic-eng area 1 Mpls traffic-eng tunnels mpls label range 100 199 Interface fast0/0 LDP discovery sources: IGP metric: 1 Lists the Layer 3 protocol supported by the integrated IS-IS protocol. Currently only CLNP R1#sh mpls forwarding-table We see that on R1 , the outgoing label of the relevant route prefix is untagged . The R1 's routing table temporarily without any change. In this environment now, although R1 still be able to ping through 3.3.3.3 , but in fact has a problem, because it is a direct walk IPv4 packets, rather than the package label. P Address The PATH message carries a label request object, which is hopped and hopped from the tunnel first-end router to the tail router. ! RFC 3847 Each tag mapping message contains two elements : FEC TLV and Label TLV Next-address 10.1.45.5 10.1.12.2 Interface eth 0/1 Ip unnumbered Loopback0 tunnel mode mpls traffic-eng tunnel destination 5.5.5.5 The concept of "similar" in IP R2.00-00 !! activation level1 of MPLS TE Set-overload-bit Router ospf 1 Interface eth 0/0 Attribute tag and affinity attribute Mpls traffic-eng tunnels mpls label range 400 499 IGP Neighbor: ID 10.1.12.2 42000 We see that the forwarding aspect of the data is this: When the router initiates IIH , the circuit type in the header is set according to the configuration we have made : L1 , L2 or L1-2 . Remaning timer This command will cause the tail router to advertise implicit empty labels. (default action notification explicit empty label) Local binding: tag: imp-null R2 (config-router)#authentication key-chain test level-2 R2 (config-router)#authentication mode md5 level-2 ! RSVP Signalling Info: 0 kbits/sec Redistribute isis ip level-2 into level-1 route-map test * 10.1.123.2, from 2.2.2.2, via FastEthernet0/0 Pop tag Outgoing interface FastEthernet0/0 Process ID 1, Area 0 In this way, my network resources will be more rationally utilized. When R1 goes to 1.0/24 and 2.0/24 , traffic will be sent to different tunnels on R1 . At this moment R1 is the head end of my tunnel , and R5 is the end. The tunnel can set bandwidth requirements so that my tunnel can make more scientific and reasonable routing in the network, not just using OSPF metric for routing. The calculation of the tunnel path is done on the R1, which is the tunnel first-end router. In order to enable the head-end router to calculate the tunnel path more reasonably (not only using metric , but also participating in the path with elements such as available bandwidth and link attributes. Computation), we need to extend the link state routing protocol running in the network, in order to flood the information required for more path calculations, extended OSPF and IS-IS can accomplish this task.