Re: SSG20:serial1/0: LMI link is down due to errors over threshold(n392)

Hi Kevin,

This may be the issue where ISP has the LMI keepalives configured at there end on the fame relay switch and we do not have the LMI keepalives configured at our end. This may lead to link flaps.

This may be confirmed by running the following command on a interface which encapsulation is Frame-relay:

get int ser1/0 frame-relay lmi


To enable LMI keepalives on the SSG device, issue the following CLI command:

unset interface "serial2/0" frame-relay lmi no-keepalive


When troubleshooting Frame Relay between Juniper Firewalls and other devices, please also check following options:

LMI-type:                                         itu, ansi
Inverse ARP:                                  Disabled by default
Frame Relay Encapsulation:     IETF RFC 1490

The frame-relay info and parameters may be checked with the command :

get int ser1/0 frame

Please update the with output of the above if this does not resolves the issue.

Also please follow the below mentioned link for more information :

# http://kb.juniper.net/InfoCenter/index?page=content&id=KB9541&actp=search&viewlocale=en_US&searchid=1303800104120

Thanks ,

Rishi Surana