Is it possible to configure an SI interface on an aggreagted ethernet port for L2TP?
Downstream LAC connects to a switch on a VLAN and then 2 x 10g ports connect to the MX104 on ae0.
I cannot seem to find docs that say whether you can or not. I thought the SI interfaces was tied to a physical port and therefore would not work with an ae interface. Could you let me know if this is possible please?
As per my understanding, you are trying to configure the si on the MX routers.
If yes, per my knowledge I think we will not be able to do this configuration on the aggregated ethernet (AE) bundle as you would need a physical interface to carry the L2TP tunnel packets.
The inline service interface is a virtual physical service interface that resides on the Packet Forwarding Engine. This si interface, referred to as an anchor interface, makes it possible to provide L2TP services without a special services PIC. The inline service interface is supported only by MPCs on MX Series routers. Four inline service interfaces are configurable per MPC-occupied chassis slot.
MX104 contains the same forwarding engine as MPC2 and si-* interfaces are fully supported:
On MX80 and MX104 routers, you can configure only four inline services physical interfaces as anchor interfaces for L2TP LNS sessions: si-1/0/0, si-1/1/0, si-1/2/0, and si-1/3/0. You cannot configure si-0/0/0 for this purpose on MX80 and MX104 routers.
Please try configuring si-1/*/0 and let us know if it works.
However, ASI - or multiple SI - on MX80 (and MX104) does not make much sense since MX80 has a single forwarding chip, and SI/ASI is a feature of the forwarding chip as a whole, not a feature of individual port. In other words, if You have si-1/0/0 interface and ge-1/0/0 interface, then when ge-1/0/0 goes down, si-1/0/0 does not.