Re: Protect an STM-1 interface.

Hi,

AFAIK STM protection accross 2 nodes can be achieved with APS:

http://www.juniper.net/documentation/en_US/junos15.1/topics/example/sonet-basic-aps-support-configuring.html

However I am not sure about the l2circuit protection.

Apparently, ALU has a solution for this scenario, although the below scenario is ATM:

https://infoproducts.alcatel-lucent.com/html/0_add-h-f/93-0267-HTML/7X50_Advanced_Configuration_Guide/MC-APS_PW-RED.pdf

I believe in JUNOS, this could be done using l2circuit backup neighbors in a full-mesh of primary & backup:-

#show protocols l2circuit 
neighbor 192.168.0.3 {
    interface ge-0/0/1.0 {
        virtual-circuit-id 10;
        backup-neighbor 192.168.0.4 {
            virtual-circuit-id 11;
        }
    }
}

Worth testing in a lab.