cisco ccna training online

cisco ccna training online

Then apply the ACL on R2 , connect to the interface of R1 , in the direction 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 : Use the lockdown keyword (note that the above configuration is configured in the TE tunnel port). * 0x0000000F Interface eth 0/2 LockDown: disabled Loadshare: 2000 10.1.24.0 [115/20] via 10.1.123.2, FastEthernet0/0 *Aug 18 09:06:02.699: peak rate =250000 bytes/sec O 202 OutLabel : FastEthernet1/0, 301 The label mapping message advertised locally is meaningful to the local . The label corresponding to the same FEC advertised from different interfaces is different. The IETF 's draft-ietf-isis-ipv6-05.txt specifies what IS-IS adds to support IPv6 . It is mainly a newly added two TLVs ( Type-Length-Values ) supporting IPv6 routing information and a new NLPID ( Network Layer Protocol Identifier ). IS-IS is not like RIP and OSPF . These two protocols have separate versions of RIPng and OSPFv3 support IPv6 . R1#sh ip os mpls ldp interface fa0/0 Advertising Router: 1.1.1.1 LS Seq Number: 80000001 Mpls traffic-eng router-id loopback0 mpls traffic-eng area 0 Label 1 router warning label Set as a P2P sub-interface or broadcast link (if it is fully interconnected) The CEF entry indicates that to go to 4.4.4.4 , the IP packet needs to be stamped with a value of 203 , and then the packet is dropped to the next hop 10.1.12.2 and thrown out from the Fa0/0 port. If the L1 / L2 router redistributed external routes to Level-1 , the Level1 area in you can learn the route, but R2 does not route injection Level2 area is Backbone of Network 5.5.5.5 0.0.0.0 area 0 Reservable Bandwidth[3]: 75000 kbits/sec, In this way , when the IP packet is tagged on the border device, the TTL value in the original IP header is not copied , but a 255 value is used instead. R2-PE1#show mpls forwarding-table detail Area Address(es): 49.0001 SNPA: cc03.1ab0.0000 We went to traceroute on R1 6.6.6.6 R1#traceroute 6.6.6.6 Ip address 4.4.4.4 255.255.255.255 *Aug 18 04:37:06.239: version:1 flags:0000 cksum:DEB3 ttl:255 reserved:0 length:132 *Aug 18 09:06:02.699: 10.1.12.2 (Strict IPv4 Prefix, 8 bytes, /32) We see that although the tunnel is established between R3 and R5 , this tunnel is invisible to R1 . In the eyes of R1 , only the OSPF links are OSPF cost , so R1 goes to R6 , which is definitely The above link is preferred because the cost is small. C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/24 is subnetted, 1 subnets UP 1.1.1.1/32 Used to publish link state information is somewhat similar to OSPF of LSA stuff 0/0/0 ! We can avoid this problem by using overload-bit . The command is explained as follows (configured under the router isis process): Show mpls traffic-eng link-management advertisement 0x2995 AutoRoute: disabled LockDown: disabled Loadshare: 20000 bw-based Ip address 10.1.23.3 255.255.255.0 Mpls traffic-eng tunnels ip rsvp bandwidth The two new TLVs are: 10.1.12.2 10.1.23.2 Bandwidth change *Aug 18 09:06:07.919: Path MTU: 4294967295 Network 1.1.1.1 0.0.0.0 area 0 Mpls traffic-eng router-id Loopback0 mpls traffic-eng area 0 0/0/0 Election DIS . In this network,cisco ccna training online, the DIS will generate and flood the new pseudo-node LSP on each of the routing layers it participates in (whether L1 or L2 ) and on each LAN it is connected to . Each router on the LAN establishes adjacency with all other routers and DISs , and does not elect to back up the DIS router. The elected DIS does not guarantee that it will always be DIS . For the LAN interface, a 1- byte circuit ID is appended to the 6- byte SysID of the specified intermediate system ( DIS ) to form a 7- word. Mpls ldp neighbor 3.3.3.3 targeted ldp Et0/1 My Address: 10.1.12.1 *Aug 18 09:06:07.919: Token bucket fragment (service_id=1, length=6 words BandwidthOverride: disabled LockDown: disabled Verbatim: disabled Modify ldp holdtime , default 15S Interface loopback0 ip router isis OSPF checks by embedding the interface MTU field in a DBD packet. R1#show ip ospf database opaque-area self-originate Swap This command will cause the penultimate hop router to still carry the label when sending data to the end. This label is an empty label. 75000 The global configuration command metric-narrow can be restored to the original default configuration. Router(config)#tunnel mpls traffic-eng path-selection metric ? igp use IGP metric SystemID Length : Identifies the length of the system ID . A value of 0 indicates a length of 6B , a value of 255 indicates a length of 0 , and other system ID fields may have a length of 1-8 bytes. 1178 Ip address 10.1.34.3 255.255.255.0 Mpls traffic-eng tunnels ip rsvp bandwidth Router-id 3.3.3.3 *Aug 18 04:37:06.239: Error Node: 10.1.12.2 Metric: 0 Label location R1#sh ip rsvp interface Next Hop *Aug 18 09:06:07.919: Session Name: R1_t0 Interface Ethernet0/0 Now the initial environment, R1 can learn inter-area routes, and R2 locally re - routes to level 1 route 2.2.2.0 . Of course, since R2 sets the attached-bit , R1 also generates a default route to R2 . *Aug 18 04:37:06.243: Tun Dest: 5.5.5.5 Tun ID: 0 Ext Tun ID: 1.1.1.1 *Aug 18 11:26:02.546: We found, R2 external routing re-released locally gone; R2 from level2 injection level1 of inter-area routes are gone; while R2 can not be used as R1 next hop of the default route. There is only one R2 local direct connection 24.0 route. PHP penultimate jump pop-up mechanism O 5.5.5.5 [110/31] via 4.4.4.4, 00:23:47, Tunnel0 Interface Tunnel0 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. Pop Label Config Parameters: Ip cef 0x0000000E Set the synchronous holddown timer to 5S , so that after 5S times out, R1-R4 establishes the OSPF adjacency. Tib entry: 1.1.1.1/32, rev 2 Untagged Area Address(es): 49.0001 SNPA: cc03.1ab0.0000 Tunnel mpls traffic-eng autoroute metric relative parsing if the configuration of R2 changes as follows: State Changed: 00:20:27 0x26DC LDP [115/30] via 10.1.24.2, Serial0/0 2.0.0.0/24 is subnetted, 1 subnets Type 2 length 48: Show mpls traffic-eng link-management advertisement ! In a Frame Relay network, SNPA is DLCI 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. RSVP extension to LSP tunnel In CISCO IOS , a re-optimization of a TE tunnel is done every 1 hour by default . !! Primary tunnel RFC 3787 Configured in OSPF process mode, this command activates MPLS TE in a specific area. Mpls traffic-eng tunnels ip rsvp bandwidth (Link ID) Designated Router address: 10.1.12.1 (Link Data) Router Interface address: 10.1.12.2 Number of MTID metrics: 0 0x1B7C Cross-region TE Tunnel ( OSPF ) Removal Trigger: configuration changed Explicit Route: 10.1.12.2 10.1.23.2 10.1.23.3 10.1.34.3 Set priority Mpls traffic-eng tunnels ip rsvp bandwidth RFC 2210 The Use of RSVP with IETF Intergrated Services RFC3209 RSVP Extension to TE *Aug 18 11:31:44.598: Cisco Router 's ISO addressing In all remote labels that bundle a particular prefix , the LSR uses only one of the labels to determine the outbound label for the prefix. RIB , which is the routing table, determines what the next hop of the IPv4 prefix is. The LSR selects the label of the next hop in the routing table that reaches the prefix from the remote label received by the downstream LSR . The LSR uses this information to create its own label forwarding information base, LFIB .