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A rack system may include a first plurality of line cards, where a particular one of the first plurality of line cards receives or sends packets via ports; a plurality of fabric cards, where a particular one of the plurality of fabric cards includes a switching fabric; a second plurality of line car

A rack system may include a first plurality of line cards, where a particular one of the first plurality of line cards receives or sends packets via ports; a plurality of fabric cards, where a particular one of the plurality of fabric cards includes a switching fabric; a second plurality of line cards, where a particular one of the second plurality of line cards receives or sends packets via ports; a first backplane that connects the first plurality of line cards to the plurality of fabric cards; and a second backplane that connects the second plurality of line cards to the plurality of fabric cards.

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1. A rack system comprising: a first plurality of line cards, a particular one of the first plurality of line cards receiving or sending packets via ports;a second plurality of line cards, a particular one of the second plurality of line cards receiving or sending packets via ports;a plurality of fa

1. A rack system comprising: a first plurality of line cards, a particular one of the first plurality of line cards receiving or sending packets via ports;a second plurality of line cards, a particular one of the second plurality of line cards receiving or sending packets via ports;a plurality of fabric cards, a particular one of the plurality of fabric cards including a switching fabric,one of the plurality of fabric cards including a baffle that separates air flow across the one of the plurality of fabric cards into a first air flow and a second air flow, the baffle directing: the first air flow across an upper portion of the one of the plurality of fabric cards and toward the first plurality of line cards, andthe second air flow across a lower portion of the one of the plurality of fabric cards and toward the second plurality of line cards;a first backplane that connects the first plurality of line cards to the plurality of fabric cards; anda second backplane that connects the second plurality of line cards to the plurality of fabric cards. 2. The rack system of claim 1, where the plurality of fabric cards includes one or more control cards. 3. The rack system of claim 1, where the first plurality of line cards is located above the plurality of fabric cards, and where the second plurality of line cards is located below the plurality of fabric cards. 4. The rack system of claim 1, where one of the first plurality of line cards, one of the plurality of fabric cards, and one of the second plurality of line cards are vertically mounted in the rack system. 5. The rack system of claim 1, where the rack system further includes an intake opening located below the second plurality of line cards, and where the second air flow enters through the intake opening. 6. The rack system of claim 1, where the rack system further includes a back panel, and where the back panel includes: a first exhaust opening located above the first backplane, where the first air flow exits the rack system through the first exhaust opening; anda second exhaust opening located below the first backplane, where the second air flow exits the rack system through the second exhaust opening. 7. The rack system of claim 1, further comprising: a first fan tray located above the first plurality of line cards, where the first fan tray includes a plurality of fans that pull the first air flow across the first plurality of line cards; anda second fan tray located below the second plurality of line cards, where the second fan tray includes a plurality of fans that push the second air flow across the second plurality of line cards. 8. The rack system of claim 1, where the first backplane includes: a first set of connectors to connect to the first plurality of line cards, anda second set of connectors to connect to the plurality of fabric cards, andwhere the second backplane includes: a first set of connectors to connect to the plurality of fabric cards, anda second set of connectors to connect to second plurality of line cards. 9. The rack system of claim 1, where one of the plurality of fabric cards includes: a first connector to connect the switching fabric to the first backplane, anda second connector to connect the switching fabric to the second backplane. 10. A fabric card comprising: a printed circuit board that includes a switching fabric; anda frame that includes a baffle, the baffle dividing air flow over the fabric card into a first air flow and a second air flow,the baffle directing: the first air flow across an upper portion of the fabric card and toward a first plurality of line cards associated with the fabric card, andthe second air flow across a lower portion of the fabric card and toward a second plurality of line cards associated with the fabric card, andthe printed circuit board being mounted onto the frame. 11. The fabric card of claim 10, where, when the fabric card is installed vertically in a chassis, the baffle extends diagonally from a bottom front corner toward a top back corner substantially across a length of the printed circuit board. 12. The fabric card of claim 10, where the printed circuit board includes: a first connector to connect the switching fabric to a first backplane; anda second connector to connect the switching fabric to a second backplane. 13. A method comprising: receiving a data unit by a first line card mounted in a rack system, the first line card being mounted in a first opening of a front panel of the rack system;forwarding the data unit to a fabric card via a first backplane, the fabric card being mounted in a second opening of the front panel;switching, by the fabric card, the data unit to a second line card via a second backplane, the second backplane being different from the first backplane,the second line card being mounted in a third opening of the front panel; andreceiving the data unit by the second line card. 14. The method of claim 13, where the first opening is located above the second opening, and where the third opening is located below the second opening. 15. The method of claim 13, further comprising: causing, using the fabric card, air flow entering the rack system to be divided into: a first air flow that flows over the first line card, anda second air flow that flows over the second line card. 16. The method of claim 15, further comprising: using a first plurality of fans to pull the first air flow across the first line card; andusing a second plurality of fans to push the second air flow across the second line card. 17. The method of claim 15, where the air flow is divided further using a baffle that separates the fabric card diagonally into an upper portion and a lower portion, where the first air flow flows across the upper portion, andwhere the second air flow flows across the lower portion. 18. The fabric card of claim 10, further comprising: a first connector to connect the switching fabric to a first connector of a first backplane of a rack system, anda second connector to connect the switching fabric to a second connector of a second backplane of the rack system.