Hi Neale, Route for destination IP of GRE tunnel was also added as an MPLS route.
And MPLS in VPP doesn't work for L2 forwarding, hence GRE tunnel was dropping packets. Thanks. Best Regards, Omer On 2019-01-08 17:12, Neale Ranns via Lists.Fd.Io wrote: > Hi Omer, > > Your config looks OK. I would start debugging with a packet trace. > > /neale > > DE : <vpp-dev@lists.fd.io> au nom de Omer Majeed <omer.majeed...@gmail.com> > DATE : lundi 7 janvier 2019 à 20:47 > À : "vpp-dev@lists.fd.io" <vpp-dev@lists.fd.io> > OBJET : [vpp-dev] :: GRE tunnel dropping MPLS packets > > 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 [1] > 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 [2] > 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 > -=-=-=-=-=-=-=-=-=-=-=- > Links: You receive all messages sent to this group. > > View/Reply Online (#11864): https://lists.fd.io/g/vpp-dev/message/11864 > Mute This Topic: https://lists.fd.io/mt/28966281/984664 > Group Owner: vpp-dev+ow...@lists.fd.io > Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [omer.maj...@sofioni.com] > -=-=-=-=-=-=-=-=-=-=-=- Links: ------ [1] http://192.168.100.4/32 [2] http://192.168.100.5/32
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