Export traffic anomaly during upgrade of export router

When the export router is upgraded, the troubleshooting steps for the export traffic anomaly caused by routing turbulence are as follows:

Network environment

An operator of the export router ne40e version upgrade, after the upgrade, the route learning normal, but from the network management shows that the flow of exports is much lower than the usual period of traffic, and traffic growth is slow, after a long time to reach peacetime flow.

Fault analysis

As a result of the NE40E upgrade process to have two reboots, a primary standby master board switching, multiple business board re-register, in this process, BGP peer frequent up/down, frequent routing turbulence.

Operators for this route turbulence to take a certain measure of protection, to the traffic received from this router to suppress, so after the normal route learning, very long time the export flow is much lower than the usual period of traffic, growth slow, after a long time to return to normal.

Operation Steps

Step 1 If you have restarted the router, you can only wait for the port traffic to recover, and if you have not restarted the router when you upgrade, make the following configuration.

Step 2 Executes the command Bgpprocess-id in the system view and enters the BGP view.

Step 3 Executes the command Peerip-addressignore in the BGP view, preventing the session from being established with the peer.

Step 4 After the upgrade completes, execute the command undo Peerip-addressignore in the BGP view, allowing the session to be established with the BGP peer.

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Case summary

When upgrading an export router, be aware of the following two points:

Before you upgrade, you will know the neighboring operators.

Before restarting the router, you can execute the command peerip-addressignore in the BGP view, and then execute the command undo Peerip-addressignore after the upgrade is complete, to avoid the impact of export traffic due to routing turbulence.