The ACL filters out LDP packets. This prevents LDP adjacency between R1 and R4 from being established. Let's observe the phenomenon. 1bit Fa0/0 Type escape sequence to abort. Tracing the route to 5.5.5.5 Experimental phenomena Configuration command Tunnel: Sender_Tspec R1#show mpls traffic-eng tunnels Neighbor 2.2.2.2 send-community extended exit-address-family !! Label protocol uses LDP (default is LDP ) Ip address 10.1.56.6 255.255.255.0 Ip cef Traffic Engineering (TE) automatic bandwidth feature adjusts the bandwidth allocation for TE tunnels based on their measured traffic load: Type escape sequence to abort. Tracing the route to 6.6.6.6 Interface eth 0/0 Create a tunnel Its ingress and exgress LSRs Such as in a frame relay environment Lists the Layer 3 protocol supported by the integrated IS-IS protocol. Currently only CLNP 1.1.1.1/32 OSPF Router with ID (1.1.1.1) (Process ID 1) i L2 5.5.5.0 [115/20] via 10.1.45.5, Serial0/2 Et0/1 AutoRoute only affects the head end of the TE tunnel. Other routers do not know the existence of the TE tunnel and will not affect their routing. OutLabel : FastEthernet1/0, 301 R2.00-00 17 Mpls ip 2.2.2.2 RFC 3567 ! Remote binding: tsr: 2.2.2.2:0, tag: imp-null tib entry: 3.3.3.3/32, rev 6 Router isis Load balancing of tagged messages LSP Seq Num Impact of route summarization on MPLS Ip router isis *Mar 1 00:09:39.243: ISIS-Adj: Rec L1 IIH from cc01.0a44.0000 (FastEthernet0/0), cir type L1, cir id 0000.0000.0002.02, length 1497 Prefix Config Parameters: Downstream cannot assign labels, no MPLS enabled 1230 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 . Of course, the above method is not safe. Therefore, in special cases, we may want the L1\L2 router to conditionally set the ATT bit and set it more controllable. Then we can associate the route-map and match a specific one in the route-map . Routing, as long as this route is in my routing table, route-map is satisfied, I will set ATT . The interface of each router activates RSVP and MPLS TE tunnel support. The checksum calculation knows the end of the packet starting from the field after the remaining time-to-live field in the LSP . When the LSP copy is propagated between routers in the network, its checksum field is not modified. Create a TE tunnel on R1 . The source is its own loopback0 . The destination is 5.5.5.5 for R5 . See below for more details. Area address Verify view DIS , initially composed of the local SystemID + unique local circuit ID . The router starts to listen to ESH , ISH , IIH at the same time . Tunnel: Version=0, length in words=7 Next, add a PVC between R2 and R3 : 0180-C200-0015 Activate LDP on all devices. To facilitate observation, specify the label range for each device . For example , the label range of R1 is 100. 10.1.12.2 The configuration of R2 is as follows: Ip address 6.6.6.6 255.255.255.255 TOS 0 Metrics: 1000 !! default tunnel port advertised cost = 1000 Mpls ip 100 BW (kbps) The level2 route is injected into the level1 area , and these level2 routes can be summarized on the L1/L2 router . The configuration is as above. We have found, R6 originating packet is IP ,cisco ccna certification training, to the R4 , R4 check CEF table, the destination found: 5.5.5.5 entry is associated with a the Label : 303 , then R4 will IP over cladding pressure tab 303 , and then lost Give the next hop 10.1.34.3 which is R3 . The following is the CEF entry for R4 : When using the Explicit method to establish a tunnel , you need to associate an explicit path . Circuit circuit *Aug 18 09:06:07.919: version=0 length in words=10 Peer-to-peer network Flooding Status: ready *Aug 18 11:26:02.546: 75000 Network 10.1.34.3 0.0.0.0 area 0 mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 301 Ip address 10.1.123.2 255.255.255.0 Show clns neighbors 17 The label is incorrect. This situation only occurs when the IGP is OSPF . Because if the loopback is used as the router-id of the ldp and it is not 32 -bit, OSPF will automatically issue the 32 -bit loopback address. Causes the label to be assigned an error. Then, R4 goes to 5.5.5.5 and the next hop is 10.1.12.1 . When 6.6.6.6 accesses 5.5.5.5 , the IP packet arrives at R4 . R4 checks the CEF and labels the IP packet. The key is On this label, R4 will use the label of 10.1.12.0 for this route ( 12.0 is the next hop to 5.5.5.5 ), and this label is assigned by R3 (the label I give to the export data is always the LDP neighbor. s Mark).
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Exam Code: 200-125
Certification Provider: Cisco
Certification Exam Name:CCNA Routing & Switching
Update Date: Dec 21,2024
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