Posted on July 27, 2020 4:40 pm
 |  Asked by Duc Le
 |  116 views
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Hi,

I am trying to configure BGP EVPN using route-type 5. I am run into issue that route table show learned route via Null0. However my control plane show the correct prefix is imported to BGP table.

#show ip route vrf CORE

C 10.24.4.0/23 [0/0]
via Vlan2404, directly connected
B E 10.27.4.0/27 [20/0]
Null0
B E 10.224.4.0/23 [20/0]
Null0

#show ip bgp 10.27.4.0/27 vrf CORE
BGP routing table information for VRF CORE
Router identifier 10.24.5.251, local AS number 65024
BGP routing table entry for 10.27.4.0/27
Paths: 2 available
65002 65000 65001
2.2.2.1 from 1.1.1.101 (192.168.2.0), imported EVPN route, RD 1.1.1.101:50002
Origin IGP, metric 0, localpref 100, IGP metric 0, weight 0, received 00:10:09 ago, valid, external, best
Extended Community: Route-Target-AS:50002:50002 TunnelEncap:tunnelTypeVxlan EvpnRouterMac:50:01:00:ca:7a:8d
Remote VNI: 50002
Rx SAFI: Unicast

65023 65002 65000 65001
2.2.2.1 from 1.1.1.105 (2.2.2.5), imported EVPN route, RD 1.1.1.101:50002
Origin IGP, metric 0, localpref 100, IGP metric 0, weight 0, received 00:10:09 ago, valid, external
Extended Community: Route-Target-AS:50002:50002 TunnelEncap:tunnelTypeVxlan EvpnRouterMac:50:01:00:ca:7a:8d
Remote VNI: 50002
Rx SAFI: Unicast

Can someone help please?

 

Thank you

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Posted by Vikram
Answered on July 27, 2020 8:54 pm

Hi Duc,

Could you please provide the output of the following commands

- show vlan dynamic
- show vlan internal allocation policy
- show tech | no-more

Alternatively, please go ahead and open a Tac case by emailing support@. Thanks

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Answered on July 28, 2020 1:20 am

Hi Duc,

Thank you for writing to the forum. May I know what is the version of EOS you are running on the switch?
Is it an MLAG? You may try to flap the BGP peer and then look if the issue persists. For more information,
please feel free to contact support@arista.com (TAC Team)

Thanks,

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Posted by Vignesh
Answered on July 29, 2020 4:59 pm

Hi Duc,

 

Can you please confirm whether we see the right Dynamic vlan mapping for the VRFs we extending across  in the vxlan . To confirm that we can check the following output

 

" show interface vxlan 1 " it should have the proper Dynamic vlan to vrf vni mapping , please send us the output to confirm the behavior you see

 

 

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Posted by Alexis Dacquay
Answered on August 3, 2020 6:37 pm

Duc,

What is your routing configuration, in particular: BGP?

Is there any recursive lookup for the routing, leading it to null0?

 

show run | section bgp

 

 

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