Cisco CCNA Security Exam Training (640-553) – Using the “Clear Dmvpn Session” Command

In today’s article, I’m going to quickly tell you about the Cisco IOS privileged EXEC mode (router#) command called “clear dmvpn session“. Network administrators (like you) use the “delete dmvpn session” Command to clear Dynamic Multipoint VPN (DMVPN) sessions.

In other words, you can use this command to kill existing DMVPN sessions based on input parameters.

Below is the command syntax:

clear dmvpn session [peer {nbma | tunnel ipv4-address | ipv6-address}] [interface tunnel number] [vrf vrf-name] [static]     

As you can see, this command has several keywords and (optional) arguments:

pair- This keyword (optional) is used to specify a DMVPN peer.
nbma- This (optional) keyword is used to specify non-broadcast map access (NBMA).
tunnel – This keyword (optional) is used to specify a tunnel.
ipv4 address – This argument (optional) is the IPv4 address of a DMVPN peer.
ipv6 address – This argument (optional) is the IPv6 address of a DMVPN peer.
Interface- This keyword (optional) is used to view DMVPN information about a specific interface.
tunnel number – This (optional) keyword with argument combination is used to specify the tunnel address for the DMVPN peer.
virtual reality vrf tunnel – This (optional) keyword with combination of arguments is used to clear (remove) all Next Hop Resolution Protocol (NHRP) sessions related to the specified Virtual Forwarding and Forwarding (VRF) configuration.
static – Y, this keyword (optional) is used to delete all static and dynamic NHRP entries. Remember, if you decide not to use this keyword with the command; only dynamic NHRP entries will be deleted.

By the way, if you decide to use the command, make sure your router is running Cisco IOS 12.4(20)T or higher.

I hope this article was very informative and helped you quickly understand the use of the clear dmvpn session command. If you need to learn more; I suggest you visit my website where you will find the latest information on Cisco CCNA Security Exam Techniques (640-553).

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