AR160 work as the CE, but PE cannot learn the private route from CE

Latest reply: Sep 30, 2018 08:04:11 1293 5 10 0
Issue Description

AR160 work as CE device, AR2200 work as PE device. On AR160, G0/0/0 connect to private network and binding to VPN instance test. G0/0/1 connect to PE device and binding to VPN instance test too. OSPF protocol use to exchange routing between CE and PE. After OSPF peer state change to normal on PE and CE device, the PE device cannot learn the private route advertise on CE device.

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transparent.gif Alarm Information

NA

transparent.gif Handling Process

1. Checking the OSPF peer state, it is normal and there is no limit for routing learning.

2. Checking OSPF LSDB table, the routing already in the LSDB.Subnet 10.0.4.0 

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3. Checking the ospf peer informaiton, the Tag value is 1. As both of the tag value is 1, the OSPF protocol will think there is a network loop,Therefore, OSPF detects routing loops when calculating routes.

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transparent.gif Root Cause

When OSPF protocol binding with vpn-instance, if both of the tag value is 1, the OSPF protocol will think there is a network loop,Therefore, OSPF detects routing loops when calculating routes.

transparent.gif Solution

Set the tag to 3 when CE device import the private to ospf protocol.

#

ospf 1 router-id 10.100.100.74 vpn-instance test

 import-route direct

 import-route static tag 3

 area 0.0.0.1

  network 10.100.100.28 0.0.0.3

  network 10.100.100.72 0.0.0.3

#

END

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Barret
Created Sep 28, 2018 03:51:59 Helpful(0) Helpful(0)

This is a good case, it clearly explain the ospf protocol how to detect and avoid the route loop, and I have a question about this case, is it necessary for any ospf vpn-instance configuring the tag when we import the static route ? I hope that you can explian this question to me. This post was last edited by Barret at 2018-09-30 08:50.
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faysalji
Created Sep 28, 2018 18:21:45 Helpful(0) Helpful(0)

Thanks ........
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If you think my post/reply is useful, please click the Helpful button and flag my post as a BEST ANSWER. Thanks
Torrent
Created Sep 29, 2018 03:19:18 Helpful(0) Helpful(0)

This is a good example. I have a question about this case. can OSPF build neighbor if both said not in the same subnet?AR160 work as the CE, but PE cannot learn the private route from CE-2764945-1
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Skay
Created Sep 29, 2018 03:23:03 Helpful(0) Helpful(0)

This is a good example. I have a question about this case. when ospf stuck at 2-ways , what's the possible reason ?
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Mark.hu
Created Sep 30, 2018 08:04:11 Helpful(0) Helpful(0)

thanks for your sharing This post was last edited by Mark.hu at 2018-10-31 07:16.
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