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need configure the below command to detect the terminal all the time, then it will not be offline.

Created Dec 29, 2018 09:47:19Latest reply Dec 31, 2018 22:43:45 374 5 7 0
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【Problem Description】

Our users are facing disconnections to the applications connected whenNAC is applied and also observed gateway is also not reachable during theissue.
【Problem Analysis】


As today remotesession, we can see all the terminals offline reason is “ARP detect fail” asfollow


<CTS_CHN_T-NAGAR_SW2_4TH_F>dispaaa offline-record all


 ------------------------------------------------------------------------------


  Username             :141877b3cae7


  Domainname           : default


  UserMAC             : 1418-77b3-cae7


  User accesstype      : MAC


  User accessinterface : GigabitEthernet0/0/20


  Qinqvlan/User vlan   : 0/10


  User IPaddress       : 192.168.228.48


  User IPV6address     : FE80::137:70C4:B95B:906C


  UserID              : 550


  User logintime       : 2018/09/28 13:56:41


  Useroffline time     : 2018/09/28 14:43:53


  User offline reason  : ARP detect fail


 


According to thereason, so we configure the below command


access-userarp-detect vlan 10 ip-address 192.168.228.6 mac-address 0000-0c07-ac0a


 


Thenthe terminal disconnect(plug-out cable) and connect again, we observe more than10 minutes, didn’t disconnect again, seems fine.


Pleasekeep observing, once any news, please update us.


 


Another thing, please note: once any fault terminal,please disconnect(plug-out cable) and connect again, then that command can beeffective and issue can be solved.


【Root Cause】


Once the ip-phonedon’t use for a period of time, the gateway will detect the terminal failed,then make terminal offline, so we can see the offline reason is “ARP detectfail”


【Solution Description】


Once the ip-phonedon’t use for a period of time, the gateway will detect the terminal failed,then make terminal offline. After the period of time, customer want to use theip-phone again, then it will re-authenticateagain. So occurred previous issue.


So we need configurethe below command to detect the terminal all the time, then it will not beoffline.


access-userarp-detect vlan 10 ip-address 192.168.228.6 mac-address 0000-0c07-ac0a

  • x
  • convention：

Helpful (7) Favorite(0) Share Reply Comment
yjhd     Created Dec 29, 2018 10:11:24 Helpful(0) Helpful(0)




Once the ip-phonedon’t use for a period of time, the gateway will detect the terminal failed,then make terminal offline. After the period of time, customer want to use theip-phone again, then it will re-authenticateagain. So occurred previous issue.




So we need configurethe below command to detect the terminal all the time, then it will not beoffline.




access-userarp-detect vlan 10 ip-address 192.168.228.6 mac-address 0000-0c07-ac0a
  • x
  • convention：
SupperRobin  Novice   Created Dec 29, 2018 11:24:26 Helpful(0) Helpful(0)

Once the ip-phonedon’t use for a period of time, the gateway will detect the terminal failed,then make terminal offline, so we can see the offline reason is “ARP detectfail”
  • x
  • convention：
Finn92  Novice   Created Dec 29, 2018 11:30:59 Helpful(0) Helpful(0)

Once the ip-phonedon’t use for a period of time, the gateway will detect the terminal failed,then make terminal offline. After the period of time, customer want to use theip-phone again, then it will re-authenticateagain. So occurred previous issue.




So we need configurethe below command to detect the terminal all the time, then it will not beoffline.


  • x
  • convention：
littlestone     Created Dec 29, 2018 19:09:58 Helpful(0) Helpful(0)

ARP (Address Resolution Protocol) is a TCP/IP protocol for obtaining physical addresses based on IP addresses. When the host sends information, it broadcasts the ARP request containing the destination IP address to all hosts on the network and receives the return message to determine the physical address of the target; after receiving the return message, it broadcasts the IP address.
  • x
  • convention：
w1  Moderator   Created Dec 31, 2018 22:43:45 Helpful(0) Helpful(0)

From this case, i get more new information and solution for such issue, and the solution "access-userarp-detect vlan 10 ip-address xx.xx.xx.xx mac-address xx-xx-xx-xx-xx-xx" are very useful and clear, thanks for your sharing
  • x
  • convention：
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