Blade router with nat support
AssigneeCisco Technology, Inc.
InventorsDileep Kumar Devireddy, Michael Smith, Saravanakumar Rajendran, Pradeep K. Kathail, Chandrashekhar Appanna, Jeffrey Ym Wang
Life of this patent
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Abstract
A blade router for increased interface scalability is provided. The blade router may address interface scalability by having each of the linecards manage its interfaces locally and may use the concept of virtual and local interfaces for intelligent forwarding. The blade router may appear as a single router from the customer perspective during configuration. For some embodiments, two virtual interfaces may be used, one for regular interface traffic and another for Network Address Translation (NAT)-enabled interface traffic.
Claims20
A network routing system, comprising:
- a chassis;
- a plurality of router linecards disposed in the chassis;
- and
- first and second virtual interfaces for routing between two or more of the plurality of router linecards, wherein each of the router linecards maintains a forwarding information base (FIB) for directing incoming packets to a local interface or to one of the first and second virtual interfaces to be received by other router linecards in the plurality.
A method comprising:
- receiving a packet in a first router linecard of a plurality of router linecards disposed in a chassis;
- forwarding the packet from the first router linecard to a first or a second virtual interface for routing between two or more of the plurality of router linecards based on one or more selection criteria;
- and
- receiving the packet from the first or the second virtual interface in a second router linecard of the plurality of router linecards.
A method comprising:
- configuring a forwarding information base (FIB) of a first router linecard of a plurality of router linecards disposed in a chassis to forward a packet to a first virtual interface for routing between two or more of the plurality of router linecards if the packet is to be forwarded to a second router linecard in the plurality and if the packet meets one or more selection criteria;
- and
- configuring the FIB of the first router linecard to forward the packet to a second virtual interface for routing between the two or more of the plurality of router linecards if the packet is to be forwarded to the second router linecard and if the packet does not meet the one or more selection criteria.
Dependencies are inferred from the claim text.