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10.1.34.4 [MPLS: Label 400 Exp 0] 4 msec 0 msec 4 msec Protocol overview There are two types of tunnel priorities: Et0/0 ! The configuration of R1 is as follows: The SWAP process is well understood. Note that the LSR only processes the top label when it processes the tag data for multiple tags in the tag stack. therefore Let's look at the picture. If R1 to R6 want to establish a TE tunnel , which is the optimal path, and the bandwidth requirement is 30Mbps , what is the calculation process? First of all, thanks to the flooding of link state information in the zone, " OSPF or IS-IS for MPLS TE extensions ", ...... The HELLO interval is the transmission period of the hello packet, with 25% jitter to reduce the possibility of IIH synchronous transmission in the network . At CISCO Path Protection During the ES-IS work process, the end system sends an ESH ( ES Hello ) message to a specific address to notify the router of its existence. The router listens to the ESH packet to discover the ES existing in the network , so that the packet arriving at the specific ES address is subsequently forwarded to the ES . In ES-IS ,take ccna exam online, the router advertises its own existence to the ES by sending an ISH ( IS Hello ) message to a specific address . ES also monitor ISH , if a plurality of received IS transmitted ISH , ES will then be selected, and sends all data to the IS .