I configured an SRX345 cluster, in which I inserted 1 module "LTE Mini Physical Interface Modules (LTE Mini-PIM)" on each node.
I followed the procedure for LTE Mini-PIM in a High Availability Cluster Mode from the link below:
https://www.juniper.net/documentation/us/en/software/junos/interfaces-security-devices/topics/topic-map/lte-mini-pim-topicmap.html#d92e164
We performed the following switching tests: -
1). Restart for the node with the modem up - OK switches in 4 minutes
2). Turn off the main cellular interface with disable - ok switches in 10 seconds
3). Disconnection from the network for one of the SIMs with APN change in the config. - NOK no longer switches, both cellular interfaces remain down.
Please help us with this situation where failover/switching did not happen and help us in fixing the issue.
admin> show configuration interfaces cl-1/0/0
dialer-options {
pool 1 priority 100;
}
act-sim 1;
cellular-options {
sim 1 {
select-profile profile-id 1;
radio-access automatic;
{primary:node0}
admin> show configuration interfaces cl-6/0/0
pool 1 priority 1;
admin> show configuration interfaces dl0
unit 0 {
family inet {
negotiate-address;
family inet6;
pool 1;
dial-string 1;
redial-delay 10;
route x.x.x.x/32;
always-on;
admin> show modem wireless profiles cl-1/0/0 slot 1
Profile details
Max profiles: 16
Default profile Id: 1
Profile 1: ACTIVE
Valid: TRUE
Access point name (APN): topex
Authentication: None
IP Version: IPV4V6
Profile 2: Invalid
Profile 3: Invalid
……….
admin@> show modem wireless profiles cl-6/0/0 slot 1
Profile 2: Inactive
…………
admin> show interfaces terse | match dl0
dl0 up up
dl0.0 up up inet y.y.y.y/30
admin> show interfaces terse | match cl-
cl-1/0/0 down down
cl-1/0/0.0 up down
cl-6/0/0 up up
cl-6/0/0.0 up up
Currently it is active on node 1.
After this we change the APN for cl-6/0/0 to something else and then the interface goes down and Failover/Switch to the other CL interface.
admin> show modem wireless profiles cl-6/0/0 slot 1
Access point name (APN): BLABLA
Profile 4: Invalid
Profile 5: Invalid
And when we check the interface status, Cl interface remains down on both the interface and also dl interface does not have any IP assigned to it.
cl-6/0/0 down down
cl-6/0/0.0 up down
admin>
dl0.0 up up inet
The only way to failover the traffic is by disabling the interface where we changed the APN name and after few seconds or max a minute the other cl interface comes up and dl interface gets an ip as well..
admin# set interfaces cl-6/0/0 disable
cl-1/0/0 up up
cl-1/0/0.0 up up
dl0.0 up up inet a.b.c.d/30
After having an extensive troubleshooting, we found that we need to have one more command for this is to work properly.
set interface dl0 unit 0 dialer-options self-recover-time 15
Once we added this above line, failover started to work fine.