ccna online practice

ccna online practice

R1#show mpls forwarding-table 4.4.4.0 detail RSVP path establishment process Ip address 3.3.3.3 255.255.255.255 i L1 i L2 Router ospf 1 R2 redistributed direct route 2.2.2.0 is gone, inter-area route is still, and R1 no longer uses R2 as the next hop of the default route. Note that the LSP sent by R2 is also overload-bit set. . RFC1195 This TLV , in this way, provides a simple and reliable mechanism for advertising hostname information. As shown in the figure below, this is an LSP message: Ip rsvp bandwidth IP lookup and tag lookup Router(config-if)#mpls traffic-eng flooding thresholds up/down ? Note that LDP does not assign labels to BGP routes by default , but we also know that BGP routes have next-hop , and this next hop is reachable for IGP routes, and LDP will be this (next hop) It is very important that the address is assigned to the route assignment label. 10.1.12.2 This can be area at any level within the router adjacency relationship; may be other area adjacent L2 or L1 / L2 router forming L2 Where IS neighbor is placed adjacent to the MAC 4 6B is systemID + 1B of PSN ID Priority 1 : 9375000 FastEthernet0/0, Src IP addr: 10.1.12.2 Addresses bound to peer LDP Ident: Router-id 3.3.3.3 ! LSPID LSP Seq Num LSP Checksum LSP Holdtime ATT/P/OL 4 10.1.12.1 1060 msec 984 msec 1080 msec *Aug 18 11:26:02.546: *Aug 18 09:06:02.699: SESSION type 7 length 16: First R2 routing table: 1.1.1.0 [115/20] via 10.1.12.1, FastEthernet0/0 !! OSPF cost of the interface Network 10.1.24.2 0.0.0.0 area 0 Reservable Bandwidth[6]: Experimental configuration Protection Link (link protection) Interface eth 0/0 Path: valid Type 9 flooding range only on this link The routing table of R3 is as follows (omit direct route): Initial database synchronization is performed after the adjacency is established. Physical Bandwidth: Physical bandwidth of the 100000 kbits/sec !! interface 1.1.1.1 0 [521] 2 10.1.34.3 [MPLS: Label 303 Exp 0] 856 msec 1012 msec 1072 msec Link ID:: 0 Local tag: 104 After the configuration is complete, the level 2 LSP sent by R2 will carry the cipher text authentication TLV information (the level 1 LSP is not carried). If this configuration is maintained, we will find that R2 can only learn the R1 release. Routing, this is because level1 LSPs are not authenticated. After completing this experiment, R3 and R4 complete the configuration. *Aug 18 09:06:07.919: Error Node: 10.1.12.2 1103 Local tag Router ospf 1 Local binding: tag: 104 My Address: 10.1.23.2 If an LSP is continuously destroyed during transmission,ccna online practice, it will be continuously cleared by other routers, and the source router will continue to resend. This creates an LSP destruction storm. CISCO IOS allows routers to ignore corrupted LSPs and write errors only to log files locally. Open with the lsp-ignore-errors command. With PHP's penultimate hop pop-up mechanism, C allocates POP labels for local direct-connected prefixes and advertises them to other LDP neighbors. The R2 re-released 2.2.2.0 external route is still there; the inter-area route is gone, except for a R2 local direct connection of 24.0 ; in addition, R1 still does not use R2 as the next hop of the default route. *Aug 18 09:06:07.919: Refresh Period (msec): 30000 OutLabel : FastEthernet1/0, implicit-null RSVP Signalling Info: *Aug 18 11:31:44.598: CSPF maximum arbitration Therefore, in an NBMA network, such as a frame relay environment, it is strongly recommended to use the P2P sub-interface to run ISIS . Physical_bw: 100000 (kbps), max_reservable_bw_global: 75000 (kbps) Configuration command LSP Holdtime 5.5.5.5 [110/2] via 0.0.0.0, 00:00:01, Tunnel0 Two processes: neighbor discovery process, session establishment process Outgoing tag or VC Reservable Bandwidth[1]: The configuration of R5 is as follows: If the ES and the IS have the same area ID , then all ESs in the same area will establish an adjacency with the layer 1 router on the shared medium . IS-IS Level-1 Link State Database: (Link ID) Designated Router address: 10.1.23.3 (Link Data) Router Interface address: 10.1.23.2 Number of MTID metrics: 0 Ip address 4.4.4.4 255.255.255.255 Now let's consider another scenario. Suppose we add a physical connection between R1 and R5 . In order to facilitate the experiment, I directly pull a line between R1 and R5 . Everyone has the right to have multiple routers in this new path. Play the imagination and kiss: A label switch router (LSR) Ip address 10.1.123.1 255.255.255.0 *Aug 18 09:06:07.919: Error Node: 10.1.12.2 300 Now a result, since the R1 has the MPLS LDP-IGP synchronization, R1 will 10.1.12.0/24 this link metric transferred to 65535 (in fact, this time the R1-R2 between OSPF adjacency should DOWN off, will save the configuration If R1 is restarted, the OSPF adjacency relationship between R1 and R2 will not be established. Therefore, R1 is preferred as R4 as the next hop to the 3.3.3.3 network, and LDP adjacency is maintained between R1 and R4 .