ccna mcq

ccna mcq

Src 1.1.1.1, Dst 5.5.5.5, Tun_Id 0, Tun_Instance 9 RSVP Path Info: *Aug 18 09:06:07.919: SENDER_TEMPLATE type 7 length 12: Password: not required, none, in use 0x0000000D Which table is specifically checked depends mainly on the Layer 2 encapsulation of the received data. For example, if the Layer 2 encapsulation is Ethernet (data frame), look at the value of the Type / Length field of the frame header : OSPF packets are encapsulated in IP packets, so they are transmitted at the network layer. The metric is 31. The calculation method is of course very simple, as follows: Interface Tunnel0 Interface Fa0/0 ! 906 Such as in a frame relay environment !! Interface priority for electing DIS Test 2 : SET-overload-ON-Startup 'bit the wait-for-BGP Of course, when deploying, we strongly recommend that the same tunnel should have the same priority and priority. (Link ID) Designated Router address: 10.1.12.1 (Link Data) Router Interface address: 10.1.12.2 Number of MTID metrics: 0 RSVP message type The Level 2 LSP contains all the prefix information that may be reached in IS-IS . Level1 LSP is only used in the local area. PDU This state has three values: down , init , up Router ospf 1 SPF calculation Path: valid The loopback0 address space of all devices is xxxx/32 , and x is the device number. Network 10.1.56.6 0.0.0.0 area 0 IP protocol TLV . If a router does not recognize a TLV , it will be ignored. Basic noun Ip router isis router isis Three types of TLS have been added to the extended IS-IS for TS : 75000 Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Different TLV field values ​​can be included in the LSP to advertise various different routing information. Local tag Network 10.1.56.6 0.0.0.0 area 0 C 1.1.1.0 is directly connected, Loopback0 5.0.0.0/24 is subnetted,ccna mcq, 1 subnets Router isis Router(config)#interface fast0/0 Here there is a potential problem, because Level1 Router , do not know level2 routing (outside the region) information, instead of looking for the nearest L1 / L2 router to your destination, then it may appear sub-optimal path In order to solve this problem, IS-IS introduced a mechanism called route leakage. Maximum bandwidth : 12500000 *Aug 18 09:06:07.919: peak rate =250000 bytes/sec Activate the MPLS TE extension for each router's OSPF and manually set the RouterID for MPLS TE . Perform routing protocol functions in the routing domain LSP TLV field of Level 1 route To support regional repair i L1 *Aug 18 11:26:02.546: SESSION Different TLV field values ​​can be included in the LSP to advertise various different routing information. basic concept I/E R1#show mpls forwarding-table 4.4.4.0 detail Use the detail keyword to view the details of the LFIB forwarding entry, including the Layer 2 information, and all the label content. If you don't add it, you can only see the top label. Set the synchronous holddown timer to 5S , so that after 5S times out, R1-R4 establishes the OSPF adjacency. Reservable Bandwidth[7]: Route-map test permit 10 router isis Traditional TTL operation IS-IS Level-1 Link State Database: 10.1.34.0/24 5.5.5.5 [110/31] via 10.1.23.3, 00:02:29, Ethernet0/1 Note: The tunnel 's build priority cannot be set higher than the hold priority. Link State ID: 1.0.0.0 Opaque Type: 1 Reservable Bandwidth[4]: About CLNP The configuration of R2 is as follows: Note that at this time, although the LDP adjacency between R1 and R2 has been broken, in principle, LDP does not adjacency, in the case of synchronizing, Link connected to Broadcast network Link ID : 10.1.12.2 Types of Priority 4 : 9375000 5.5.5.5 3.3.3.3 IP internal reachability information Network 10.1.23.2 0.0.0.0 area 0 Interface tunnel0 R3 found that the inbound tag 300 's tag package, the outbound tag is a POP , so he pops the top tag (actually a layer), and then directly throws the popped data to 10.1.34.4 , note that this time it does not need Find the FIB table again because there is already a next hop in the LFIB table. Eventually this data was passed to R4 . It can be seen that we allocated 33M bandwidth for the tunnel with priority 6. The total reserved bandwidth of the original interface is 75M , and it is divided into 33M , so there is 42M . We can also see because we have modified the priority. The reservable bandwidth of the tunnel of level 6 is therefore lower, and the reserved bandwidth is also changed. 8bit maximum 255 , usually in the labeling when it is the ordinary ip packet TTL direct copy came ISs flood new LSPs to all neighbors Show mpls ldp parameters Protocol version: 1 Its ingress and exgress LSRs Tag rewrite with Fa0/0, 10.1.12.2, tags imposed: {203} 4.4.4.4/32 R2.00-00 Needless to say this? Activate CEF ! *Aug 18 09:06:02.699: LABEL_REQUEST type 1 length 8 : Local binding: tag: 100 Bw[4]: DIS , initially composed of the local SystemID + unique local circuit ID . The router starts to listen to ESH , ISH , IIH at the same time . 10.1.34.4 LSP Database LSP database Next Hop There is a unique NET Device Internet segment 10.1.xy.0 / 24 , where xy is the device number, X small y large Which table is specifically checked depends mainly on the Layer 2 encapsulation of the received data. For example, if the Layer 2 encapsulation is Ethernet (data frame), look at the value of the Type / Length field of the frame header : The sub-TLV of 0-244B is mainly used for MPLS TE. Router(config-router)# max-area-address xx Nterface Peak rate Configure MPLS TE tunnel on R1 . Use show isis hostname to view the mapping of host names IGP Id: 1.1.1.1, MPLS TE Id: 1.1.1.1 Router Node id 1 Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Next-address 10.1.23.3 Remove: The top label is removed. The forwarding of the message depends on the remaining tags in the tag stack, or it is forwarded as an unlabeled message. Mpls traffic-eng tunnels ip rsvp bandwidth Metric: 0 ! TCP connection: 2.2.2.2.61914 - 1.1.1.1.646 Pop Label AutoRoute: disabled LockDown: disabled Loadshare: 20000 bw-based auto-bw: disabled TCP connection: 2.2.2.2.61914 - 1.1.1.1.646 Ok, now let's analyze, when R1 wants to send data to R4 's Loopback 4.4.4.4 , how the data is transmitted. First analyze the control level: Interfaces: End host. For example , the ISO CLNP workstation searched by the ES-IS protocol . R1(config-keychain)#exit Mpls traffic-eng tunnels mpls label range 200 299 Then we wait for the BGP neighbor relationship on R2 to be established. You can debug it: My Address: 10.1.23.2 *Aug 18 11:31:44.598: Incoming PathError: Switched 2.2.2.2/32 103 Interface eth0/0 OSPF and ISIS also have mechanisms for periodic flooding Prefix Router ospf 1 Tunnel mpls traffic-eng forwarding-adjacency The configuration of ip rsvp bandwidth R3 is as follows: 2.2.2.2 is directly connected, Loopback0 5.5.5.5 [110/31] via 5.5.5.5, 00:00:01, Tunnel0 10.1.12.0/24 is directly connected, Ethernet0/0 10.1.23.0/24 is directly connected, Ethernet0 /1 Election order of DIS Tunnel mpls traffic-eng path-option 10 explicit name R2R4R5 Link state Protocol Data Unit Link State Data Unit 1/0/0 We started CEF on R3 . In fact, in CEF , the default load balancing method is destination-based load balancing. CEF 's Overload LSP ID - SNPA MAC address, etc. Outgoing And OSPF difference is that a router must belong to a whole region, the border area can not on the router, it said, the interface can not belong to a certain area, the other interface belonging to other regions Ordered control mode : Odered Control *Aug 18 04:37:24.735: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to down MPLS LDP-IGP synchronization is enabled in the IGP process and applied to all interfaces running the IGP . Record Route: NONE ISs flood new LSPs to all neighbors Next-address 10.1.24.4 Mpls ldp sync Router-id 4.4.4.4 Interfaces: Moreover, it is not necessary to maintain the matching time of both parties when establishing the adjacency relationship. Mpls traffic-eng tunnels mpls label range 300 399 Platform based : Per-Platform Tunnel mpls traffic-eng path-option 10 explicit name R1R2R5 tunnel mpls traffic-eng path-option 20 dynamic 1 Protction the Node (Node Protection) IS-type ! * 0x0000000C Mpls traffic-eng tunnels ip rsvp bandwidth ! Record Route: NONE The configuration of R4 is as follows: 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. IS-IS is an important part of CLNS . It is a protocol for dynamically exchanging routing information between routers and routers ( IS and IS ) in a CLNS network environment . IS-IS is implemented in ISO 10589 . definition. IS and IS , that is, the communication between the router and the router uses IIH ( IS-IS Hello ) packets.