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high latency occurred after new line added between the branch office and HQ

Latest reply: Feb 19, 2019 07:32:35 767 1 0 0

topology as below:


the customer said that there was a l2vpn between brance office and the HQ, after the new line add which directly connect the branch and HQ, the high latency occurred, when remove the backup direct connection, the service restore.


1.       we suspect the service are forwarded to the lower bandwidth line, in which lead the high latency.

after confirmed with the client, the direct connection line has a higher bandwidth, so when the service is normal on the MPLS L2VPN line, it wouldn’t be abnormal when a higher bandwidth line carries the service.

2.       we suspect the poor qulity of the backup line lead a lot of packet loss, which result in the high latency.

after check the backup line qulity, the result shows the line is fine.

3.       we suspect the network loop occurred.

connect up the backup line, and check the stp interface status on the branch and HQ switch, both the four interface are forwarding.



4.       check with the ISP, they didn’t enable the access switch to transfer the layer 2 packets transparently, after enable the function on the access switch, the stp block the interface correctly.



the command l2protocol-tunnel all enable will enable the interface to transfer the layer 2 packets transparently.

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Created Feb 19, 2019 07:32:35 Helpful(0) Helpful(0)

hope this can provide you a new thought in the troubleshooting
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