ccna practice test free download

ccna practice test free download

Point-to-point link R2.00-00 Signalling: connected Fa0/0 Ip route 5.5.5.5 255.255.255.255 Tunnel0 Bandwidth: 0 All ISs and ESs in a routing area must have the same length of system ID 0xCC Tunnel mpls traffic-eng autoroute announce tunnel mpls traffic-eng priority 7 7 Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Globally activate MPLS TE tunnel and set MPLS label space IS-IS is IIH Overview Link connected to: a Transit Network Network 5.5.5.5 0.0.0.0 area 1 Start LSP ID : Start LSP ID . Indicates the first LSP ID of the LSP range described in the TLV field . *Aug 18 09:06:07.919: 10.1.24.4 (Strict IPv4 Prefix, 8 bytes, /32) Outgoing 3.3.3.3 10.1.34.4 4.4.4.4 *Aug 18 09:06:07.919: 10.1.12.2 (Strict IPv4 Prefix, 8 bytes, /32) 10.1.56.0/24 DR 1 Net 49.0001.0000.0000.0002.00 PATH *Aug 18 09:06:02.699: 5.5.5.5 (Strict IPv4 Prefix, 8 bytes, /32) In IS-IS , there are three in the HELLO packet: one is the interface point ( Point-to-Point the IS to the IS Hello PDUs ), one is LAN on to Ll Router ( Level-1 to the IS the Hello PDUs the IS LAN ), a method Is the L2 router on the LAN ( Level2 LAN IS to IS Hello PDU ) Reservable R3 is a passive session recipient. ATT/P/OL Router-id 4.4.4.4 Router(config-router)#mpls traffic-eng router-id {interface} At this time, TTL propagation can be turned off ( CISCO router is enabled by default) PATH Ip unnumbered Loopback0 tunnel destination 4.4.4.4 tunnel mode mpls traffic-eng *Aug 18 09:06:02.699: TIME_VALUES type 1 length 8 : 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 configuration of R2 is as follows: *Aug 18 09:06:07.919: EXPLICIT_ROUTE type 1 length 68: TE metric is a parameter used to build a TE topology that is completely different from the IP topology (although by default it is equal to IGP metric ) 301 !! Use the dynamic calculation method to establish the tunnel PATH Inter-domain routing protocol !! The outbound label is 301 10.1.12.2 IS-IS Level-1 Link State Database: ! Redistribute connected level-1 !! Redistribute the local direct loopback 2.2.2.0/24 to level1 redistribute isis ip level-2 into level-1 route-map test The configuration of R1 is as follows: Metric: 0 75000 * 0x0000000F Interface fast 1/0 Interface eth 0/1 Remote binding: tsr: 2.2.2.2:0, tag: imp-null remote binding: tsr: 3.3.3.3:0 , tag: 301 Tunnel mpls traffic-eng autoroute announce Interface eth 0/0 Static mapping,ccna practice test free download, when the network size is large, the configuration is surprisingly large. The enhanced features of IS-IS are defined in RFC 2763 , among which there is a mapping definition of dynamic host names. RFC 2763 introduces a new TLV , Type 137 , which is included in the LSP sent by the router participating in the dynamic mapping. Test 1 : set-overload-bit 75000 668 0x0000000F ! LDP IETF standard ( TCP/UDP port number 646 ) TDP CISCO private ( TCP/UDP port number 711 ) Fragment number : 0 LABEL Routing entry for 5.5.5.0/24 *Aug 18 11:26:02.546: The LSP : R3.02-00 , here marked as non-dummy node 0 , then R3 is a the DIS , and that the LSP , is a dummy node the LSP . Where IS neighbor is placed adjacent to the MAC After the above configuration is completed, there is one more unidirectional direct link to R5 on R2 . This link will directly participate in the routing calculation of R2 itself. The overall result is that there are now three straight connectors on R2 : eth0/0 , eth0/1 , tunnel0 . Readdressing Src 2.2.2.2, Dst 4.4.4.4, Tun_Id 0, Tun_Instance 6 RSVP Path Info: *Aug 18 09:06:07.919: version=0, length in words=7 Interface eth0 1/0 Interface eth0/1 The loopback0 address of all devices is xxxx/32 , and x is the device number. Mpls ldp neighbor 1.1.1.1 targeted ldp Router(config-if)# mpls traffic-eng attribute-flags ? CSNP However, not all messages with the same label belong to one FEC , because the EXP values ​​of these messages may be different and may be performed differently, so they may belong to different FECs . !! Path error message sent by R2 to R1 LSP Seq Num LSP Checksum LSP Holdtime To sum up, I said three commands: Session_Attibute NET Tunnel mpls traffic-eng path-option 10 dynamic We complete the experiment as long as the R2 and R4 configuration domain-password can, Rl is a zero-configuration ( Domain Authentication actually level2 LSP embedded for authentication TLV ). ESH is ES transmitted to IS of 0/0/0 Host host RFC 3277 4.4.4.4/32 About CLNP Tspec: ave rate=0 kbits, burst=1000 bytes, peak rate=0 kbits RSVP Resv Info: 103 10.1.12.2 Certification Information The virtual link implements a level 1 repair path through the backbone . The zone designated router sets the partition repair of its level1 LSP . 10.1.34.3 10.1.34.4 Implicit empty label Path option 10, type dynamic (Basis for Setup, path weight 3) Is-type level-2-only !! R4 is L2 router , so modify the is-type type to level2-only Type-10 Opaque Link Area Link States (Area 0) Each ES belongs to a specific area, when the ES finds the nearest IS by listening to the HELLO ( ISH ) grouping of the intermediate system . Modify the configuration of R2 : *Aug 18 09:06:07.919: Router bgp 2345 Attached-bit Bytes tag Network 10.1.34.3 0.0.0.0 area 0 mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Mpls traffic-eng router-id Loopback0 mpls traffic-eng area 0 Outgoing Downstream on Demand max hop count: 255 Downstream on Demand Path Vector Limit: 255 LDP for targeted sessions *Aug 18 09:06:07.919: peak rate =250000 bytes/sec We started CEF on R3 . In fact, in CEF , the default load balancing method is destination-based load balancing. CEF 's Each tag mapping message contains two elements : FEC TLV and Label TLV Number of Links: 4 Bgp router-id 2.2.2.2 LDP ID election is the same as OSPF routerID Network 10.1.12.2 0.0.0.0 area 0 *Aug 18 09:06:07.919: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 Network 2.2.2.2 0.0.0.0 area0 After all the LDP routers have sent the label bundles to each other, everyone gradually builds their own LFIB . Mpls traffic-eng tunnels mpls label range 500 599 Fa0/0 Some SPFs are restricted for inter-domain and external routing, and any inter-domain link turbulence caused by smaller areas and hierarchical topology extensions leads to complete *Aug 18 09:06:02.699: HOP type 1 length 12: Interface Ethernet0/1 100 . An MP-iBGP connection is established between R2 and R5 . Reservable Bandwidth[4]: R3 Link[0 ]:Nbr IGP Id: 10.1.12.2, nbr_node_id:8, gen:51 frag_id 0, Intf Address:10.1.12.1 Debug ip rsvp dump-messages Next Hop Link ID:: 0 !! R2 has two direct links to participate in MPLS TE . This is the first, which is F0/0 . IS-IS level2 to OSPF Tunnel mpls traffic-eng bandwidth 33000 L1 router The configuration of R2 is as follows (all configurations are omitted from the configuration of interface IP ): 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. 75000 204 Pop Label 5.5.5.5/32 0 Tu0 point2point MAC/Encaps=14/18, MRU=1500, Label Stack{304}, via Et0/1 0E00003017000E00003016108847 00130000 Signalling: connected Removal Trigger: configuration changed Router isis Network 5.5.5.5 0.0.0.0 area 0 List the adjacent L1-routers . Note that our section says L1 router. When using the Explicit method to establish a tunnel , you need to associate an explicit path . IDI Initial Domain Identifier , a variable-length initial domain identifier that identifies a subdomain under AFI ISO10589 L1 104 Interface eth 0/1 Local tag Tunnel mpls traffic-eng path-option 10 explicit name R1toR5 Type escape sequence to abort. Tracing the route to 6.6.6.6 Set priority Reservable Bandwidth[7]: Label Space ID is generally 0 , indicating that our label is a platform - based ( Per-platform ) label space. Debug ip rsvp dump-messages Ip address 10.1.34.4 255.255.255.0 Prefix Fa0/0 Or Tunnel Id Tunnel mpls traffic-eng path-option 10 dynamic ISO IS-IS Routing Protocol Interface fa0/0 mpls ip .......................................... SNPA is equivalent to the Layer 2 address of NSAP or NET . After flooding related information through the IGP protocol ( OSPF or ISIS ), all TE routers form a unified TEDB in the area. Interface eth0/0 TE Metric : Administrative weight Fa0/0 *Aug 18 09:06:02.699: Token bucket fragment (service_id=1, length=6 words Ip unnumbered loopback 0 tunnel destination 5.5.5.5 tunnel mode mpls traffic-eng Tunnel mpls traffic-eng path-option 10 dynamic R1#show mpls traffic-eng tunnels protection Test the transmission process of the data stream, observe the phenomenon The data packet is stamped by A , and the TTL value of the label header is copied to the TTL in the IP header (of course, minus 1 first ), and as the data frame is transmitted in the MPLS network , the TTL value in the MPLS header is decreasing to 0. Then discard until the data frame out of the MPLS domain, then the TTL in the IP header will start working. At the time of outbound, the TTL in the tag header is decremented by 1 and copied to the TTL in the IP header .