Hello Boris
All of these commands are being used in this lesson except for the last one:
I’ll attempt to give you a brief summary of each, but you can also see them in action in the lesson too.
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ip nhrp shortcut- This command allows the spoke routers to makes changes in the CEF entry when they receive a redirect message from the hub. -
ip nhrp network-id- This command simply enables NHRP on the interface. All NHRP devices within the logical network must be configured with the same network identifier. -
ip nhrp map- This command statically configures the IP-toNBMA address mapping of IP destinations connected to an NBMA network. At least one static mapping is necessary to reach the next-hop server. -
ip nhrp nhs- This command specifies the address of one or more NHRP servers. -
ip nhrp responder- This command is used to designate the primary IP address of the next hop server that an interface will use in NHRP reply packets when the NHRP requestor uses the responder address option.
You can find out more information about these and other NHRP commands at this Cisco documentation.
I hope this has been helpful!
Laz