Feature/virtual iFaces#20
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This PR enables jumbo frames (MTU of 9000) to Ravel.
Ravel previously added routes to a single local interface to advertise them. In the past, attempts were made to increase MTU on this interface to 9000. However, this eventually led to packet loss in production environments when the segment length of the incoming packet differed with the MTUs on local pods.
This led to the approach in this PR that leverages virtual interfaces. In this approach, there is a 1:1 parity between virtual interfaces and ip addresses for both IPV4 and IPV6. In this way, we can tune each interface to a desired MTU for incoming traffic. Ravel consumes the
mtuandmtu6fields of the configmap to determine what MTU to set on a local interface, if not 1500.To implement this in a given environment, the pod interface must be set to 1500 as well. Within Comcast, this is implemented via a Kubernetes CNI plugin.
This MTU change does not affect the legacy ARP director mode. Jumbo frames will not be enabled there at the time of this change.