ccna sample paper

ccna sample paper

Tunnel mpls traffic-eng autoroute announce tunnel mpls traffic-eng priority 7 7 LDP inbound label binding filter i ia 10.1.24.0 [115/148] via 10.1.123.2, FastEthernet0/0 Label 3 implicit null label The figure above shows the format of IS-IS packets. The yellow background color is the common field of IS-IS packets. Each packet then has its own additional header field, which is then the TLV . For point-to-point interfaces, SNPA is the unique identifier for the circuit. For example, on the HDLC point-to-point link, the circuit ID is 0x00. Bw[2]: There seems to be no problem in this environment,ccna sample paper, but the route summary has problems in the point-to-point LSP environment, such as MPLS VPN , TE. Configuration command *Aug 18 04:37:06.239: ERROR_SPEC type 1 length 12: The initial-backoff defaults to 15s and the maximum-backoff defaults to 120s . IGP floods TE information when: RRO Is-type level-1 metric-style wide *Aug 18 04:37:06.239: The composition of the router , Backbone must be continuous. 0 kbits/sec 10.1.12.2 4 msec 0 msec 4 msec The configuration of R1 is as follows: Bw[4]: Complete MPLS TE configuration on R1 . First we look at R1 : This behavior will continue until the RESV message arrives at the head end router of the TE tunnel LSP . That is, after the request is made by the head end router, the label is advertised hop by hop from the tail router to the head end router. This shows that the TE tunnel uses the downstream passive DOD label distribution. There are two types of tunnel priorities: Ip cef LSP TLV field of Level 2 route For prefix-access-list – the IP access list that selects the destinations for which the labels will be lab environment Default route injection 1010 RFC1195 tunnel interface can be configured directly IGP Metric , for example, if the running OSPF , directly in the tunnel configuration mouth ip ospf cost can ! Mpls ip interface fast1/0 Outgoing interface Certification Information All interconnected IPs are shown L1/L2 router is usually located on the area boundary 3.3.3.0 [115/20] via 10.1.123.3, FastEthernet0/0 10.0.0.0/24 is subnetted, 3 subnets Message Ip address 3.3.3.3 255.255.255.255 Attribute Flags: 0x00000000 L1/L2 router is usually located on the area boundary Tunnel mode mpls traffic-eng tunnel destination 4.4.4.4 Select the path with the lowest IGP cost Reservable Bandwidth[5]: Although the implicit null tag also uses a tag with a tag value of 3 , tag 3 will never appear in the tag stack of the MPLS message, which is why it is called an implicit null tag. ISO10589 101 * 0x0000000B There are two ways to set the path of the TE tunnel ( Explicit explicit or Dynamic dynamic) The status of IP traffic engineering Mpls traffic-eng router-id loopback 0 mpls traffic-eng level-1 0 kbits/sec Bandwidth: 20000 kbps (Global) Priority: 7 7 Affinity: 0x0/0xFFFF Metric Type: TE (default) Use the exclude-address command to control the LSP from passing through a node (interface or router). You can use this keyword to match an interface IP or an MPLS TE router ID to let the tunnel path bypass a certain link or a router. O bits are defined in OSPF in the option field is used to indicate whether the router has the ability to send and receive opaque the LSA . The unreservable bandwidth is the bandwidth remaining after being supplied to the TE , that is, the maximum bandwidth of the link minus the bandwidth currently reserved by the TE tunnel. Mpls traffic-eng tunnels ip rsvp bandwidth Data plane : Data forwarding based on tags We know that IS-IS actually recognizes two types of networks, one is peer-to-peer and the other is broadcast multi-access network. For NBMA , such as frame relay networks, IS-IS deployment should be cautious, to see what will be wrong: *Aug 18 11:31:44.598: Path MTU: 1500 *Aug 18 11:31:44.598: Discovery Sources: 10.1.12.2 Mpls traffic-eng tunnels ip rsvp bandwidth Router ospf 1 Priority 2 : 9375000 The configuration of R2-PE1 is as follows: Interface fast 1/0 Forwarding Adjacency forwarding adjacency Interface Tunnel0 Reservable Bandwidth[5]: R2 has sent IIH , but R1 does not recognize it because R2 does not have configuration authentication, which will cause R1 not to put R2 into its own IIH and send it back to R2 (included in the IS neighbors of the TLV ). A password is assigned to the R2fa0/0 port, and the adjacency is normal. By capturing the packet, it can be seen that the TLV for authentication has been included in the IIH , and the authentication password exists in the form of plaintext in the TLV .