Gre Tunnel on VRF BW issue, ASR920

[Tonay.R]

I am facing an issue and confused about the output. Configured GRE tunnel in a VRF and Tunnel IS UP with no Ping loss in Tunnel interface IP. But when I add a route or some BW then it started huge p2p loss and tunnel gets up/down and ping loss again. 

I dont know What I am missing or what can be the issue, I tried the same tunnel in Cisco ASR 1004 (no vrf) and working fine. 

-----My Device License and Model ----

License Level: advancedmetroipaccess
License Type: Permanent
Next reload license Level: advancedmetroipaccess

cisco ASR-920-12SZ-IM-CC (Freescale T1042) processor (revision 1.2 GHz) with 908379K/6147K bytes of memory.

Tunnel Config ------
interface Tunnel1
vrf forwarding MGNT
ip address 10.60.1.9 255.255.255.248
ip tcp adjust-mss 1460
tunnel source 103.1xx.251.2
tunnel destination 103.xx.44.1
tunnel vrf MGNT

[MHM Cisco World]

I need more info 
the tunnel destination is reach via mgmt vrf RIB ?
how you config static route ?

MHM 

[Tonay.R]

Yes tunnel destination is reahable via MGNT vrf RIB

Using static route to forward all to another router where INTERNET is connected. Using this route, tunnel destnation is reachable. And I have also verified that Tunnel p2p IP is in MGNT vrf as it supposed to be.

I have configured BGP for routing.
show bgp vrf MGNT vpnv4 unicast summary

[MHM Cisco World]

OK, so there is default route via mgmt interface 
then you config BGP over tunnel, when you run bgp did you receive any prefix  103.xx.44.1? 
what happened here is following 
1- tunnel is UP use default route via mgmt to 103.xx.44.1
2- bgp is UP and advertise 103.xx.44.1
3- tunnel stop use default route and use prefix learn via bgp (longest match) 
so tunnel is reach via tunnel itself 

try use route-map IN filter prefix you learn from BGP 

MHM

[MHM Cisco World]

ANY updates

MHM

[ccieexpert]

what are you most likely seeing is what is called "recursive routing" .

you need to make sure that tunnel source/destination are not routed over the tunnel.. Either add static routes for them, or filter them out in your BGP routing protocol.

https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/22327-gre-flap.html

**Please rate as helpful if this is useful**