pass cisco exam

pass cisco exam

*Aug 18 11:31:44.598: 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. *Mar 1 00:00:32.759: ISIS-Upd: Building L2 LSP i*L1 0.0.0.0/0 [115/10] via 10.1.123.3, FastEthernet0/0 0 kbits/sec Phenomenon and troubleshooting It can be seen that ES-IS plays a role in the CLNS network environment as if the ICMP , ARP and DHCP protocols in the IP network work together. *Aug 18 04:37:06.243: SESSION type 7 length 16: *Aug 18 09:06:07.919: 5.5.5.5 (Strict IPv4 Prefix, 8 bytes, /32) MPLS VPN Architecture Volume 2 Session hold time: 180 sec; keep alive interval: 60 sec Discovery hello: holdtime: 15 sec; interval: 5 sec Discovery targeted hello: holdtime: 90 sec; interval: 10 sec If the highest bit (the leftmost bit) is 0 , the metric type is default metric . If it is 1 , it means the metric is not supported. Overview Both interfaces: 1 interface: We see that in the LFIB of R3 , going to the destination of 1.1.1.1 , there are two label paths for load balancing. The attribute tag is a 32-bit field, which is described in detail later. Basic experiment ( NodeProtection ) MPLS and Tag switching Mpls traffic-eng tunnels mpls label range 300 399 Labels: 200 RECORD_ROUTE *Aug 18 09:06:07.919: Refresh Period (msec): 30000 687 Can I perform route summarization on the L1 router ? Label or VC ISO 10589 Interface Tunnel0 DIS Ip explicit-path name R2R4 enable next-address 10.1.12.2 Result of the output for the extended RSVP using TE headend router tunneling according TE calculated database TE optimal path of the tunnel, and with reference to the bandwidth constraints. In addition, the optimal path can also be defined by an explicit path option that the user configures on the tunnel interface. In either case, the headend router knows the specific path used by the TE tunnel. Fa0/0 Outgoing PDU *Aug 18 09:06:07.919: version=0 length in words=10 After all the LDP routers have sent the label bundles to each other, everyone gradually builds their own LFIB . Ip address 10.1.123.1 255.255.255.0 Bw[1]: 10.1.34.4 [MPLS: Labels 403/505 Exp 0] 0 ​​msec 4 msec 0 msec 10.1.45.5 5.5.5.5 Then, if you are in the tunnel port on R1 , use the following configuration: Interface eth 0/1 Interface Serial0/1 *Aug 18 09:06:02.699: 5.5.5.5 (Strict IPv4 Prefix, 8 bytes, /32) 1bit IS R2.00 AutoBandwidth IS-IS is PDU has . 4 Species : R1#deb ip rsvp dump-messages ! 201 LS age: 705 IS-IS only supports reliable diffusion on point-to-point links, and the spread on the broadcast link is unreliable. However, periodic broadcasts through DIS Since OSPF is inherently designed to support IP routing, and IS-IS still has some vendors' devices that are not perfectly supported, OSPF is still preferred for a significant portion of the network . However , interest in using integrated IS-IS for IP routing is increasing, and most ISPs in Europe use IS-IS . Many new ISPs are also considering deploying IS-IS . Layer 1 and Layer 2 set different metrics. Provide a loop-free network End System terminal system Experimental phenomena The configuration of R2 is supplemented as follows: 75000 0 packets, 0 bytes tag information set R1#show isis neighbors Area address LSP Checksum LDP is in Frame Mode . The LSR assigns a label to each route. The local direct route is assigned a POP. Time since created: 11 minutes, 42 seconds Time since path change: 10 seconds Number of LSP IDs (Tun_Instances) used: 9 2.2.2.2/32 Interface Tunnel0 Delay metric is optional, the link transmission delay is not supported. IGP Neighbor: ID 10.1.23.2 !! means from 13.1 to 34.3 and then to the local ( 34.4 ) IGP flooding !! Pay close attention to here ESH is ES transmitted to IS of *Aug 18 11:31:44.598: Network 10.1.45.5 0.0.0.0 area 0 Message type C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/24 is subnetted, 1 subnets Tag Reservable Bandwidth[3]: 203 Next , take a look at the Tunnel on R1 : 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. Next Hop * 0x0000002B 0/0/0 Further analysis of the metric problem. We focus on 55.55.55.55 , after the basic configuration above, currently in the routing table of R2 Mpls traffic-eng tunnels ip rsvp bandwidth In OSI terminology,pass cisco exam, a host (such as a PC ) is called an ES (end system) and a router is called an IS (intermediate system). ES-IS can be said to be a "language" or routing protocol between an end system and a router. It is used to enable the end system and router on the same network segment or link to discover each other and allow the ES to learn its network layer address.