Steps to repro
====================
1)Do the basic vxlan configuration for one CSS.
2)Configure mpls over gre for both DC-GWs.Check it is configured properly.
3)Form bgp neigborship between Controller and DC-GWs and check check bgp neighborship.
4)Configure 2 VMs each on CSS-1, css-2 and CSS-3 using nova command,configure bgvpn and route update.
Check whether it is advertised to DC-GW.
5)Check fib show whether routes from DC-GW1 and DC-GW2 are present.
6)Also check the flows on css, in table 21,these should be present.
It is present only for DC-GW1.

FIB-SHOW
=====================================
opendaylight-user@root>fib-show
RD Prefix NextHop Label Origin
-------------------------------------------------------------------
100:2 10.10.1.1/32 0.0.0.0 100007 l
100:2 10.10.1.2/32 10.4.1.97 100015 l
100:2 10.10.1.3/32 10.4.1.97 100017 l
100:2 30.1.1.0/24 10.4.1.22 786431 b
100:2 40.1.1.0/24 10.4.1.22 786432 b
100:2 10.10.1.7/32 10.4.1.63 100012 l
100:2 10.10.1.6/32 10.4.1.63 100013 l
100:2 10.10.1.5/32 10.4.1.98 100016 l
100:2 10.10.1.4/32 10.4.1.98 100014 l
100:2 20.1.1.0/24 10.4.1.21 786433 b
100:2 10.10.1.0/24 10.4.1.98 100000 c
100:2 26.1.0.0/16 10.4.1.22 786431 b
100:2 1.1.1.1/32 10.4.1.22 786431 b
100:1 30.1.1.0/24 10.4.1.22 786431 b <<<<<<<<<<<<<<<<<This is not present in table21.
100:1 20.1.1.0/24 10.4.1.21 786433 b
100:1 40.1.1.0/24 10.4.1.22 786432 b
100:1 1.1.1.1/32 10.4.1.22 786431 b
100:1 26.1.0.0/16 10.4.1.22 786431 b

Flow (table21) on CSS1
============================================
root@Ubuntu-97:~# flows | grep table=21,
cookie=0x8000003, duration=1009.105s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d4c/0xfffffe,nw_dst=10.10.1.5 actions=set_field:0x445->tun_id,set_field:fa:16:3e:43:a4:ee->eth_dst,load:0x100->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=1007.273s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d4c/0xfffffe,nw_dst=10.10.1.4 actions=set_field:0x445->tun_id,set_field:fa:16:3e:1c:f7:b3->eth_dst,load:0x100->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=1005.127s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d4c/0xfffffe,nw_dst=10.10.1.6 actions=set_field:0x445->tun_id,set_field:fa:16:3e:ef:04:e1->eth_dst,load:0x200->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=994.630s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.7 actions=set_field:0x186ac->tun_id,set_field:fa:16:3e:d2:76:f2->eth_dst,load:0x200->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=994.463s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.6 actions=set_field:0x186ad->tun_id,set_field:fa:16:3e:ef:04:e1->eth_dst,load:0x200->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=994.379s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.4 actions=set_field:0x186ae->tun_id,set_field:fa:16:3e:1c:f7:b3->eth_dst,load:0x100->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=994.212s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.5 actions=set_field:0x186b0->tun_id,set_field:fa:16:3e:43:a4:ee->eth_dst,load:0x100->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=993.242s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.2 actions=group:150016
cookie=0x8000003, duration=993.159s, table=21, n_packets=0, n_bytes=0, priority=42,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.3 actions=group:150018
cookie=0x8000003, duration=995.709s, table=21, n_packets=0, n_bytes=0, priority=42,icmp,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.1,icmp_type=8,icmp_code=0 actions=move:NXM_OF_ETH_SRC[]>NXM_OF_ETH_DST[],set_field:fa:16:3e:bb:7f:cd>eth_src,move:NXM_OF_IP_SRC[]>NXM_OF_IP_DST[],set_field:10.10.1.1>ip_src,set_field:0->icmp_type,load:0->NXM_OF_IN_PORT[],resubmit(,21)
cookie=0x8000003, duration=1001.745s, table=21, n_packets=0, n_bytes=0, priority=34,ip,metadata=0x30d54/0xfffffe,nw_dst=40.1.1.0/24 actions=push_mpls:0x8847,set_field:786431->mpls_label,load:0->NXM_OF_IN_PORT[],load:0xa00->NXM_NX_REG6[],resubmit(,220)
cookie=0x8000003, duration=1001.745s, table=21, n_packets=0, n_bytes=0, priority=34,ip,metadata=0x30d54/0xfffffe,nw_dst=10.10.1.0/24 actions=write_metadata:0x138b030d54/0xfffffffffe,goto_table:22
cookie=0x8000003, duration=1001.745s, table=21, n_packets=7, n_bytes=686, priority=34,ip,metadata=0x30d54/0xfffffe,nw_dst=20.1.1.0/24 actions=push_mpls:0x8847,set_field:786433->mpls_label,load:0->NXM_OF_IN_PORT[],load:0xa00->NXM_NX_REG6[],resubmit(,220)
root@Ubuntu-97:~#