Okay. The issue could be a little more complicated than originally thought.
Given that we do not know for sure what the customer would order, we are looking at the following as a scenario:
NTE device = SRX340 - Ethernet / VDSL
The NTE device has the following ports configured:
ge-0/0/1 - towards the Customer CPE
ge-0/0/15.10 - Customer VLAN to the PE Core
ge-0/0/15.99 - Management VLAN to NTE (Only between PE core and NTE)
at-4/0/0 - DSL Failover
Requirement:
If ge-0/0/15 fails then all traffic from and to the customer will go through at-4/0/0 interface.
Possible issues with scenario requirement:
1: How the PE Core will detect that the ge-0/0/15 interface has failed?
2: The LCP (IPCP) negotiated address on the at-4/0/0 interface will have to be different than the interface on the CPE and then routing has to be in place for that?
3: How do ISPs already get around the above issues?
I note the following forum post has some information, but it does not explain it from an ISP perspective:
https://forums.juniper.net/t5/SRX-Services-Gateway/Juniper-SRX-ADSL-configuration-for-ISP-s-in-the-UK/td-p/166018
Any help would be greatly appreciated.
Thanks