Hi,
I'm running VPP on Centos 7 machine (say machine A), and running an
application on other centos 7 machine (say machine B).
I've made a GRE tunnel between those 2 machines.
vpp# show gre tunnel
[0] instance 0 src 192.168.17.10 dst 192.168.17.6 fib-idx 0 sw-if-idx 8
payload L3
Made that gre0 interface mpls enabled.
I added outgoing mpls routes in VPP for IPs on machine B
vpp# show ip fib table 2
192.168.100.4/32
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:47 buckets:1 uRPF:49 to:[0:0]]
[0] [@10]: mpls-label[2]:[25:64:0:eos]
[@1]: mpls via 0.0.0.0 gre0: mtu:9000
4500000000000000fe2f196ec0a8110ac0a8110600008847
stacked-on:
[@3]: ipv4 via 192.168.17.6 loop9000: mtu:9000
ac1f6b20498fdead000000280800
192.168.100.5/32
unicast-ip4-chain
[@0]: dpo-load-balance: [proto:ip4 index:46 buckets:1 uRPF:47 to:[0:0]]
[0] [@10]: mpls-label[0]:[30:64:0:eos]
[@1]: mpls via 0.0.0.0 gre0: mtu:9000
4500000000000000fe2f196ec0a8110ac0a8110600008847
stacked-on:
[@3]: ipv4 via 192.168.17.6 loop9000: mtu:9000
ac1f6b20498fdead000000280800
For reverse traffic I've added MPLS routes given below
vpp# show mpls fib table 0
18:eos/21 fib:0 index:29 locks:2
src:API refs:1 entry-flags:uRPF-exempt,
src-flags:added,contributing,active,
path-list:[35] locks:20 flags:shared, uPRF-list:31 len:0 itfs:[]
path:[35] pl-index:35 ip4 weight=1 pref=0 deag: oper-flags:resolved,
[@0]: dst-address,unicast lookup in ipv4-VRF:2
forwarding: mpls-eos-chain
[@0]: dpo-load-balance: [proto:mpls index:32 buckets:1 uRPF:32 to:[0:0]]
[0] [@6]: mpls-disposition:[0]:[ip4, pipe]
[@7]: dst-address,unicast lookup in ipv4-VRF:2
19:eos/21 fib:0 index:38 locks:2
src:API refs:1 entry-flags:uRPF-exempt,
src-flags:added,contributing,active,
path-list:[35] locks:20 flags:shared, uPRF-list:31 len:0 itfs:[]
path:[35] pl-index:35 ip4 weight=1 pref=0 deag: oper-flags:resolved,
[@0]: dst-address,unicast lookup in ipv4-VRF:2
forwarding: mpls-eos-chain
[@0]: dpo-load-balance: [proto:mpls index:41 buckets:1 uRPF:41 to:[0:0]]
[0] [@6]: mpls-disposition:[9]:[ip4, pipe]
[@7]: dst-address,unicast lookup in ipv4-VRF:2
When I try to ping from machine B to an IP in machine B (VPP VRF 2) through
that GRE tunnel, I receive packets but GRE tunnel drops the packets.
vpp# show int gre0
Name Idx State Counter
Count
gre0 8 up rx
packets 66
rx
bytes 6996
drops 66
(nil) 66
Is there anything else that needs to be done to get MPLS over GRE working?
Any suggestions on how to debug the issue?
Thanks a lot.
Best Regards,
Omer
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