First, EoMPLS using LDP targeted sessions is a point-to-point L2 transport service.
A Switched Virtual Interface like Vlan 3601 is thought to provide a default gateway to all users of a broadcast domain VLAN (L2 concept) connected to multiple L2 acces ports or L2 trunk ports.(point to multipoint !) on the same multilayer switch.
What if there are two L2 ports/ L2 trunks members/carrying VLAN 3601 ?
So a SVI is a L3 object that is linked to a L2 entity the VLAN with the same number.
I suppose that the dot1q tag might be stripped on the path to SVI VLAN in the current CEF forwarding implementation, so the SVI cannot see the 802.1Q tag. As a result of this the SVI cannot send frames over the LDP tunnel and they are silently discarded.
Probably you can get the ldp tunnel to be up but no frames can flow over it, ldp tunnel state is linked to the interface status of the interface with the xconnect command.
interface Vlan 3601 is up/up if at least a L2 port of VLAN 3601 is in forwarding state STP including trunk ports.
A VLAN subinterface is associated with only one physical port and is defined using the 802.1Q tag value!.
It is easier for the forwarding plane to perform the correct action in this case: take the frame with 802.1Q tag and send them over the ldp tunnel.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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