Method and apparatus for mapping data packets between lines of differing capacity at a router interface
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United States of America Patent
Stats
-
May 7, 2002
Grant Date -
N/A
app pub date -
Jun 14, 2000
filing date -
Jun 14, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A line card for a data packet router interfaces to a high-speed standard data link, and has a first portion interfacing to the router and having a plurality of slower ports, and a second portion having a framer compatible with and coupled to the data link. The framer is coupled through an ingress and an egress data path between the framer and the slower ports, each with separate ingress buffers and egress buffers for each port. An interface control circuit controls data packet transfers between the slower ports and the framer in both directions. In a preferred embodiment a function is used by the control circuit to map packets from the link to the ports, using keys extracted from the incoming packets. For an IP packet the key is the source address, destination address (SA/DA) pair, which constrains packets for same IP conversations to be routed by the same path.
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