cisco press ccna

cisco press ccna

10.1.12.2 [MPLS: Label 201 Exp 0] 132 msec 184 msec 88 msec Integrated IS-IS and OSPF are 20 century 80 late-defined, which is about 1988 years. OSPF actually evolved from an earlier version of IS-IS , but it uses IP as a precondition. The core concepts of OSPF ,cisco press ccna, such as the proliferation of link state information, the SPF algorithm, and the use of designated routers in the broadcast link, are borrowed from the IS-IS early version. Mpls traffic-eng tunnels ip rsvp bandwidth Setting the priority and maintaining the priority all indicate whether a TE tunnel can preempt another TE tunnel by using the corresponding value . The lower the priority, the higher the importance. Interface fas0/0 Automatic routing Auto Route 0xE1E2 404 Interface loopback0 Net 49.0001.0000.0000.0002.00 You can see the main two contents contained in it: one is the directly connected network segment of R1 , here is 10.1.123.0 and 1.1.1.0 , and the other is the direct connection of R1 . 10.1.34.0/24 ! !! The maximum reservable bandwidth is 75M O System ID ! ! 120s 2 MAX.Areas maximum area address. Indicates how many different zone prefixes we can configure for a router. value [0]: The configuration of ip rsvp bandwidth R3 is as follows: SENDER_TEMPLATE Device Configuration 0 kbits/sec 1.1.1.0 [115/20] via 10.1.12.1, FastEthernet0/0 104 RFC 2966 3 R2 The IS-IS network layer protocol ID in the ISO protocol stack is 0x83. Then R1 will use the IGP of Metric , and ignore R2 on the configuration of the physical interface adminnitration-weight , so after the entry into force of the above command, go R1 view on the tunnel 's path weight , it turned into a 3 . Router ospf 1 Local binding: tag: imp-null End system adjacency routing Router-id 2.2.2.2 Local binding: tag: imp-null ! !! Activate the autoroute feature of the tunnel ! *Aug 18 09:06:07.919: Incoming PROXY_PATH: Attribute Flags: 0x00000000 Reservable The flooding and interaction of LSPs eventually form the IS-IS link state database. Checksum: 0x6FEB Length: 132 Establish a target neighbor 1230 Interface eth 0/1 Expense metric Global Pool Mpls traffic-eng tunnels ip rsvp bandwidth UP FastEthernet0/0, Src IP addr: 10.1.12.2 Addresses bound to peer LDP Ident: Configuration command The configuration of R2 is as follows: Ip router isis Globally activate MPLS TE tunnel and set MPLS label space Routing information diffusion in point-to-point links Interface eth 0/1 Interface level command, modify the MPLS mtu of the interface , it should be noted that mpls mtu can not be larger than the interface mtu Mpls ip With the PHP mechanism: 75000 FIB ID: path option 10 [8] No mpls ip propagate-ttl [ forwarded | local ] 10.1.23.3 Send out from the Fa1/0 port. So, R2 replaces the tag with 300 and then throws it to R3 . CLNP is similar to the IP protocol except that it serves the ISO transport layer. IS-IS , ES-IS , and CLNP are network layer protocols that are encapsulated directly in the data link layer frame. Compared with the OSPF packet in TCP/IP , it is hidden behind the IP header. The encapsulation efficiency of the former protocol packet is higher. 0xCC i L1 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: ID: path option 10 [36] Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 If the sysID length is inconsistent, the IIH is ignored . Ip cef Adjacency R1#traceroute 4.4.4.4 If the PSNP acknowledgment is still not received after the retransmission timout , the originating router will retransmit the LSP. Ip address 10.1.23.3 255.255.255.0 Tunnel mpls traffic-eng path-option 10 dynamic As I said earlier, the NSAP address has an area adddress part that is longer, so when we get an address, how do I know which part of the address corresponds to what? Cisco IOS software from the right explanation NSAP address (here use NSAP of OSI format). First, counting from the right, the first B is NSEL , the left 6B is SystemID , and the rest is AreaID . POP is the TTL of the top-level tag minus 1 and then pops up. The new TTL value is written to the top-level tag of the outbound data. At 0XFFFFFFFF , this router will suspend the IS-IS process for MaxAge + ZeroAgeLifetime seconds, so that the LSP corresponding to this router in the entire routing domain is deleted. The IS-IS process is then restarted and the LSP is sent starting with sequence number 1 . (In fact, this situation will not arise, because even generate a per LSP , but also to 136 years after the serial number can be from 1 to reach 0XFFFFFFFF .