Ihar Hrachyshka 06cfce3756 neutron: enable ml2 mtu calculation mechanism ...

Setting path_mtu to reflect mtu for physical devices that handle traffic
issued from br-tun makes ml2 plugin to calculate mtu for tenant networks
properly, considering encapsulation headers. After that, calculated mtu
values can be propagated into instances (currently, only DHCP approach
is implemented; RA support for IPv6 subnets is under review).

This change allows to run tunnelled tenant networks in multinode when
underlying physical devices don't support jumbo frames.

Note: changing the default value in neutron would not be backwards
compatible, since it could slow down east-west tunnelled traffic in
clouds that run on jumbo-aware networks.

Change-Id: I8287677c7ad0f13fa9f5cb194f9372d04b78cb61
Related-Bug: #1527675

2016-01-21 15:15:15 +01:00

6.2 KiB

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