ccna study notes

ccna study notes

Experimental configuration *Aug 18 09:06:07.919: 10.1.45.4 (Strict IPv4 Prefix, 8 bytes, /32) Tib entry: 10.1.34.0/24, rev 12 ! Experimental procedure LockDown: disabled Loadshare: 2000 RFC 3567 Network 10.1.45.4 0.0.0.0 area 0 10.1.23.3 Send out from the Fa1/0 port. So, R2 replaces the tag with 300 and then throws it to R3 . [Supplement] The non-pseudo-node LSP represents a router , including all ISs and LANs connected to this router . 3.3.3.3/32 As long as the route prefix is ​​learned locally through the IGP , the route prefix is ​​assigned a label ( locally also assigns a POP label to the direct route ) The configuration of R3 is as follows: The label can be ejected on the (the penultimate hop). C only needs to find the FIB table to forward the received IP packet. Network 10.1.24.2 0.0.0.0 area 0 0 kbits/sec !! activation Tunnel of forwarding-adjacency Interface eth0/0 Current LSP: Link state messages are used to propagate link and node information in the area (describe the topology of the local network) Record Route: NONE Interface Loopback0 687 Note: IS-IS 's Backbone is not what a particular area R1(config-keychain)#exit The term circuit ( Circuit ) corresponding to the interface . Because the NET address is used to identify the entire device, the Circuit ID is used to indicate a different interface. The router assigns a 1- byte Circuit ID to the interface as follows . 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? With the PHP mechanism: MPLS features Config Parameters: Not triggered by ISH , once the interface is activated, the router floods the IIH message on the interface. Level1 area default route LDP inbound label binding filter System 1.0.0.0/24 is subnetted, 1 subnets MPLS TE router ID: 1.1.1.1 PSNP Label or VC Also called a pseudonode, it is a virtual router in a broadcast multi-access network, created by DIS. During the establishment of the adjacency relationship, the neighbors send CSNPs to each other (the CSNP is not sent after the adjacency is established ). *Aug 18 09:06:07.919: min unit=0 bytes, max pkt size=2147483647 bytes Path option 10, type dynamic (Basis for Setup, path weight 3) 0 kbits/sec 5.5.5.5 [110/31] via 10.1.23.3, 00:02:29, Ethernet0/1 *Aug 18 11:31:44.598: 3.3.3.0 [115/20] via 10.1.34.3, Serial0/0 3 10.1.23.2 [MPLS: Label 203 Exp 0] 964 msec 1124 msec 1008 msec Network 10.1.34.3 0.0.0.0 area 0 RSVP uses PATH and RESV messages to pass signaling in one path. The TE head end router sends a PATH message to the tail router. !! Activate IS-IS on the interface SRM ( Send Routing Message ): Send routing information message Interface eth 0/1 Session_Attibute LAN Priority: 64 Format: Phase V Used to publish link state information is somewhat similar to OSPF of LSA stuff Reservable Bandwidth[2]: !! Change the TE tunnel 's setup priority and hold priority to 5 8 CSPF maximum arbitration RSVP extension to LSP tunnel Net 49.0001.0000.0000.0002.00 IS-IS by Hello PDU padding size to the interface MTU large Periodic update. Ip address 10.1.34.4 255.255.255.0 Such as PPP , HDLC 204 55.55.55.55 and 5.5.5.5 will no longer take the tunnel . !! Activate mpls on the interface , actually activate ldp Next-address 10.1.12.2 0 kbits/sec Routing information diffusion in point-to-point links Bytes tag Can form adjacencies with other L2 (or L1/L2 ) routers 0x18B7 After the feature is activated, both R3 and R5 advertise the existence of this tunnel (in the form of a direct link) within the zone . Equivalent to having one more path (virtual path) in the topology environment. Interface Tunnel0 * 0x0000002B IP external reachability information Tspec parameter id = 127, flags = 0, length = 5 !! Path error message sent by R2 to R1 Data plane : Data forwarding based on tags Interface eth0/0 See the process of label exchange? Prove that the data is indeed on the TE tunnel . State Changed: 02:23:31 Tunnel mpls traffic-eng autoroute metric absolute y Ip address 10.1.23.2 255.255.255.0 IS-IS Level-1 Link State Database: *Aug 18 09:06:02.699: Session Name: R1_t0 Mpls traffic-eng tunnels ip rsvp bandwidth Mpls traffic-eng tunnels ip rsvp bandwidth Ip address 10.1.45.5 255.255.255.0 Interface Tunnel0 Network 6.6.6.6 0.0.0.0 area 0 *Aug 18 04:37:06.239: HOP type 1 length 12: In-label Out intf/label ! Ip cef Bw[1]: R2-PE1#show ip route R2-PE1#show mpls forwarding-table detail Ip address 5.5.5.5 255.255.255.255 Network 5.5.5.5 0.0.0.0 area 0 Experiment 1 Router(config-if)#tunnel mpls traffic-eng bandwidth BW *Aug 18 09:06:07.919: Error Value: 0x5 (No route available toward destination) 4.4.4.4/32 Router(config)#ip explicit-path name ccietea Bandwidth change R2-PE1#show mpls traffic-eng tunnels Fast Reroute Adding the force keyword will take effect immediately. Otherwise, only when the interface selected as the routeriD is DOWN , the reselection will be performed. Note: The router ID of the LDP neighbor must have reachable routes locally. Test the transmission process of the data stream,ccna study notes, observe the phenomenon Network 10.1.24.4 0.0.0.0 area 0 Name: R2-PE1_t0 Status: Interface eth 0/0 No longer take the tunnel , and then go to traceroute 55.55.55.55 from R2 , no longer see the label. We define the affinity attribute and mask of the TE tunnel of R1 . Then, when R1 calculates the path for this tunnel , R1 converts the affinity value 0x00000001 into binary, which is configured with the two interfaces of R1 . The two attribute-flags values ​​are compared one by one. Since our mask configuration is 0x00000001 , it is also written as binary, and the mask is 1 bit, which must be matched, so only the R2-R2 link is available. . In the actual network deployment, we can flexibly define the meaning of each bit of the link attribute according to our own needs , and combine the affinity attribute to control and avoid the path selection.