[Openstack-operators] Neutron Network Node Sizing

James Dempsey jamesd at catalyst.net.nz
Tue Nov 24 21:24:10 UTC 2015

Hi Operators,

I'd love to hear from anyone running multiple physical Neutron L3 Agent

Specifically: How many routers do you schedule per Neutron L3 Agent and
how much CPU/Memory do you put into an L3 Agent physical host?

Because of a couple of bugs in Linux[1][2], we have a pretty miserable
time when we cram more than 100ish routers on an L3 Agent(with VPNaaS
enabled).  Previously, we ran L3 Agents on servers that also hosted
control plane VMs (API, MQ, etc...), but now we are buying separate
hardware for L3 agent nodes.  Would love to hear about router counts /
hardware specs from other operators.

This is a Juno ML2+OVS cloud at the moment, but it will be Liberty as
soon as possible.

[1] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1486670
[2] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1403152


James Dempsey
Senior Cloud Engineer
Catalyst IT Limited

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