Dec 10, 2012 · If there is a match the switch forwards that packet per the forwarding table instruction. The matches can either be a coarse match like anything destined to IPv4 10.0.0.0/8 —> do this action, or as fine as anything matching {port 80, mac addr 0000.1111.2222, dest_ipv4 10.1.1.1/32, (any other tuple in the header) etc}.
Each rule contains a pattern that matches fields of the packet header, and a priority field to distinguish between rules with overlapping patterns. The pattern supports exactly matching all the relevant header fields (that is a wildcard rule), or matching the wildcard rule with some “don’t care” bits in the fields. There are
Jun 28, 2019 · An OpenFlow switch is a basic forwarding device that forwards the packets according to its flow table [ 15, 16, 17, 18, 19 ]. This table in the switch holds a set of flow table entries, each of which consists of match fields, counters and instructions.
• match fields: to match against packets. These consist of the ingress port and packet headers, and optionally other pipeline fields such as metadata specified by a previous table • priority: matching precedence of the flow entry • counters: updated when packets are matched • instructions: to modify the action set or pipeline processing
Megaflows are more effective when they match fewer fields. – Megaflows that match TCP ports are almost like microflows! – Described approach matches every field that appears in any flow table Requirements: – online – fast Contribution: Megaflow generation improvements (Section 5).
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As in OpenFlow, the programmer can specify multiple match tables of arbitrary width and depth, subject only to an overall resource limit, with each table configurable for matching on arbitrary fields. However, RMT allows the programmer to modify all header fields with a much more comprehensive action capability than in OpenFlow.
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Key criteria for OpenFlow designs. The good and bad. Is it really flow-based ? How do those rules work ? The impact of wildcard matching. What does OpenFlow do for my network designs and architectures ? Switching, routing, wireless, 3G – all open to change. Does OpenFlow interoperate or replace my current network ?
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Oct 29, 2011 · 1. OpenFlow and standards. “Laws, decrees, edicts, ordinances, writs will shower down upon the poor people like hailstones.” -Pierre-Joseph Proudhon Part of the appeal of any potential new order is that it always promise things will be simpler, however in time as reality turns in its vote, the new order becomes an institution with beauracracy.