Multicast VPN GRE tunnel not selecting lo0 - HELP!!
Going through Lab 8 on RackRentals real hardware and noticed something I've never seen before and suspect IOS bug/hardware.
When I enter the 'mdt default x.x.x.x' command under the VRF on R2 (7200) I get the following message:
SPRack2R2(config)#ip vrf AS200
SPRack2R2(config-vrf)#mdt default 184.108.40.206
%MDT-4-LBSRC: VRF AS200: MDT Serial2/0.12 uses source address 220.127.116.11 from a non-loopback interface
PIM sparse mode is enabled on all relevant interfaces and on lo0 (interestingly PIM is NOT enabled on the interface the tunnel uses for MDT source!)
I cannot make R2 select the lo0 interface as the source for love nor money - rebooted, taken off commands, re-added etc. Each and every time R2 insists on picking a random serial interface to address the MDT tunnel. This of course screws the rest of the multicast section as nobody can peer with R2 via PIM for the VRF multicast traffic across the backbone.
All BGP (IPv4 and VPNv4) are sourced from R2 lo0 and everything else in lab is working fine - verified config with solutions guide etc.
Any one else ever had this problem - did you ever fix it or assume it was a bug and moved on?
Cisco IOS Software, 7200 Software (C7200-K91P-M), Version 12.2(25)S9