about ccna certification

about ccna certification

Tunnel mpls traffic-eng path-option protect 10 explicit name R2R3R4 *Aug 18 09:06:02.699: Layer 3 protocol ID: 2048 AS bibliography Mpls traffic-eng tunnels mpls label range 100 199 Circuit type : 01 means L1 router, 10 means L2 router, 11 means L1/2 router 0x2995 10.1.23.3 The forwarding adjacency feature will cause the TE router to advertise the TE tunnel as a virtual path (direct link) in the IGP routing protocol area, so that all routers know the existence of the tunnel. The IGP protocol here can be OSPF or IS-IS. OSPF ensures the reliability of diffusion across all links When the tail router receives the label request object, it will assign a label to the tunnel LSP and pass the label. Router ospf 1 A little topic about OSPF in MPLS environment PseudoNode ( PSN ) InLabel : - At this time,about ccna certification, TTL propagation can be turned off ( CISCO router is enabled by default) Ip router isis interface Serial0/0 Activate LDP on all devices. To facilitate observation, specify the label range for each device . For example , the label range of R1 is 100. MPLS label 6B is systemID + 1B of PSN ID *Aug 18 11:26:02.546: Mpls traffic-eng tunnels ip rsvp bandwidth LSP , using LSP to carry all routing information RSVP ! Version=0 length in words=10 By default, CISCO IOS does not trigger re-optimization when a link in the network can be reused by a TE tunnel , but can activate this operation. To enable re-optimization when a link becomes operational in MPLS TE , use the following command: Ip address 10.1.56.6 255.255.255.0 Configuration command The authenticated TLV is not seen in the PSNP message . Metric Type: TE (default) Net 49.0001.0000.0000.0002.00 Experimental procedure If the payload of the MPLS is an IPv6 packet, the load balancing is performed according to the source and destination addresses in the IPv6 header. Mpls ldp router-id loopback0 mpls label range 200 299 interface fast0/0 Untag will remove all tag headers and turn them into a pure IP message. *Aug 18 09:06:02.699: SENDER_TSPEC type 2 length 36: Test the transmission process of the data stream, observe the phenomenon ! ! 5 10.1.15.5 1564 msec 1124 msec 1484 msec Virtual circuit ID of X.25 or ATM 10.1.12.2 (Link ID) Network/subnet number: 2.2.2.2 (Link Data) Network Mask: 255.255.255.255 Number of TOS metrics: 0 RFC1195 In an actual environment, MPLS TE is often deployed only in a few core nodes . The edge node cannot sense the existence of the TE tunnel and can only select routes according to the traditional IGP . For the device number, this IP is also the LDP routerID . 0 kbits/sec For example, the above figure, we can test on R2 , the configuration is as follows: Tun Dest: Config Parameters: Last update from 10.1.123.2 on FastEthernet0/0, 00:01:32 ago Routing Descriptor Blocks: At 0XFFFFFFFF , this router will suspend the IS-IS process for MaxAge + ZeroAgeLifetime seconds, so that the LSP corresponding to this router in the entire routing domain is deleted. The IS-IS process is then restarted and the LSP is sent starting with sequence number 1 . (In fact, this situation will not arise, because even generate a per LSP , but also to 136 years after the serial number can be from 1 to reach 0XFFFFFFFF .