Summary:
In this series of blogs, I will cover the MTU (Maximum Transmission Unit) behavior on Arista Jericho-based routers. Here is the summary:
- 1. MTU enforcement happens on the egress interfaces.
- So MTU is not MRU (maximum receive unit), large size packets are NOT dropped at ingress interfaces
- 2. Arista MTU is layer-3 MTU on Jericho chipset:
- 2.1 The MTU enforcement is only for routed packets, no action on switched traffic
- 2.2 The actual packet size is MTU size plus L2 header size, which is 14-byte for L3 routed interface or 18-byte for the trunk interface
- 3. IPv4 packets are fragmented by router CPU and capped by CoPP
Reference:
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