Friday, March 13, 2020

Bizarre L2 issue following L3 change

Hi,

I am scratching my head following a networking change for a client last week. They have a stable site to site microwave link from their primary site to their DR with several smaller sites in between (due to geography), and have a management VLAN stretched across this so they can ping all switches at all sites, and monitor them with PRTG.

Implemented new upstream firewalls, and for the first time, an internet connection at both primary and secondary, OSPF core and started removing static routes as they were replaced with OSPF routes.

Everything seemed ok...

Except users at intermediary sites started complaining about voice issues, and investigations show 10-20% ping drops AT TIMES along the L2 management VLAN.

We made no changes to that VLAN, and no switches in between are running routing, just acting as L2 Bridges.

Any suggestions?



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