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[Subscriber Management] Subscriber cannot telnet or ssh MX after upgrading to Tomcat 15.1R4 or later

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Article ID: KB31325 KB Last Updated: 16 Dec 2016Version: 1.0
Summary:

When the MX router acts as BRAS and runs a Tomcat version (15.1R4 or later) of JunOS, the subscribers (dhcp or pppoe) cannot telnet or ssh the MX router.

Cause:

The Subscriber interface does not support telnet or ssh from Tomcat versions. Junos OS is working as designed.

Solution:
The following workaround can be used to resolve this issue:

Create logical-systems and connect it with the default system by using lts interface. Then the subscriber can telnet this logical-system's IP.

In the following example configuration, note that a customer must set the interfac/IP according to the actual situation:

user@MX480-re0# show 
logical-systems {
    mgt {
        interfaces {
            lt-2/0/0 {
                unit 1 {
                    encapsulation ethernet;
                    peer-unit 0;
                    family inet {
                        address 10.0.0.3/31; <----Sub can telnet/ssh this ip
                    }
                }
            }
        }
        routing-options {
            static {
                route 0.0.0.0/0 next-hop 10.0.0.2;
            }
        }
    }
}
chassis {
    fpc 2 {
        pic 0 {
            tunnel-services;
        }
    }
}
interfaces {
    lt-2/0/0 {
        unit 0 {
            encapsulation ethernet;
            peer-unit 1;
            family inet {
                address 10.0.0.2/31;
            }
        }
    }
}
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