training ccna

training ccna

LDP inbound label binding filter This command will cause the tail router to advertise implicit empty labels. (default action notification explicit empty label) Bytes tag Outgoing Next Hop Intermediate LSRs - Intermediate LSRs receive an incoming labeled packet, perform an operation on it, switch the packet, and send the packet on the correct data link. Each ES belongs to a specific area, when the ES finds the nearest IS by listening to the HELLO ( ISH ) grouping of the intermediate system . Link State ID: 1.0.0.0 Opaque Type: 1 Control label notification through LDP (conditional notification) Ability to send detail link information , including bandwidth . Replaces IS Neighbor TLV TLV 22 can contain 7 sub- TLVs , three of which contain bandwidth information for TE Network 4.4.4.4 0.0.0.0 area 0 PDU length : the length of the entire PDU , including the header Default metric The LSP overload-bit generated by this router is set. This will cause the router to not be used by other routers as the next hop to any destination, except for its locally connected network segment. This is generally used when the router is a leaf node,training ccna, that is, the end of the network, directly connected to the user. IDI Initial Domain Identifier , a variable-length initial domain identifier that identifies a subdomain under AFI R1#show mpls traffic-eng tunnels protection Pop tag 403 MPLS TE can change the bandwidth and attribute parameters of the link through adaptation. !! Path error message sent by R2 to R1 LSPID R3.02-00 10.1.23.0/24 R2-PE1# show mpls forwarding-table Regional merger Router(config)#interface tunnel x R3.01-00 Local LDP Identifier: Removal Trigger: configuration changed Bytes tag Imagine if AB link between carrying a lot of the Tunnel , then when this root link DOWN out of time, will likely trigger a large amount in a short time PATHtear and ResvTear , so how to optimize it? The hostname can be used in the ID instead of the SysID section. This brings great convenience to our network maintenance and troubleshooting. *Aug 18 09:06:07.919: HOP type 1 length 12: Bw[6]: The following is the message format of the IIH in the LAN : Interface FastEthernet0/0 Ip cef 0x00000026 In the above figure, we define attribute tags for the two interfaces of R1 . The attribute tag attribute-flags is a 32-bit field. After saving the configuration restart R2 , the R2 after the restart is completed, ISIS lead convergence, but this time bgp Write convergence completion, so R2 resulting LSP in overload set, from R1 the following results can be seen, during this time, R1 is not R2 will be used as the next hop to other networks ( except for the network directly connected to R2 ): Network 3.3.3.3 0.0.0.0 area 0 17 10.1.12.2 AutoRoute: enabled LockDown: disabled Loadshare: 2000 bw-based auto-bw: disabled 1bit ISO IS-IS Routing Protocol Generated Next Hop The loop detection mechanism of LDP depends on the IGP protocol. [Note] If the router receives a tagged packet and the top tag cannot be found in the local LFIB , the CISCO IOS will discard it. Mpls traffic-eng tunnels mpls label range 200 299 Now let no shutdown R1 of Fa1 / 0 mouth, then R1 and R3 open the LDP session protection. Can quickly converge when the network fails Tunnel destination 5.5.5.5 Clear text interface authentication Global Pool Sub Pool 10.1.23.2 55000 But if we modify the configuration on R1 : 103 Tunnel mpls traffic-eng autoroute announce In all remote labels that bundle a particular prefix , the LSR uses only one of the labels to determine the outbound label for the prefix. RIB , which is the routing table, determines what the next hop of the IPv4 prefix is. The LSR selects the label of the next hop in the routing table that reaches the prefix from the remote label received by the downstream LSR . The LSR uses this information to create its own label forwarding information base, LFIB .