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    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001672685</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



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    <formData>
        <issuerInfo>
            <issuerCik>0001596532</issuerCik>
            <issuerName>ARISTA NETWORKS INC</issuerName>
            <secFileNumber>001-36468</secFileNumber>
            <issuerAddress>
                <ns2:street1>5453 Great America Parkway</ns2:street1>
                <ns2:city>Santa Clara</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>95054</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>4085475000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MARC TAXAY</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>628</noOfUnitsSold>
            <aggregateMarketValue>217633.40</aggregateMarketValue>
            <noOfUnitsOutstanding>314152875</noOfUnitsOutstanding>
            <approxSaleDate>08/01/2024</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>08/01/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>628</amountOfSecuritiesAcquired>
            <paymentDate>08/01/2024</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MARC TAXAY</name>
                <address>
                    <ns2:street1>5453 Great America Parkway</ns2:street1>
                    <ns2:city>Santa Clara</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95054</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>07/01/2024</saleDate>
            <amountOfSecuritiesSold>624</amountOfSecuritiesSold>
            <grossProceeds>221339.04</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MARC TAXAY</name>
                <address>
                    <ns2:street1>5453 Great America Parkway</ns2:street1>
                    <ns2:city>Santa Clara</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>95054</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/03/2024</saleDate>
            <amountOfSecuritiesSold>4493</amountOfSecuritiesSold>
            <grossProceeds>1327527.06</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>08/01/2024</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/13/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Marc Taxay</signature>
        </noticeSignature>
    </formData>
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144
0001672685
XXXXXXXX
LIVE
0001596532
ARISTA NETWORKS INC
001-36468
5453 Great America Parkway
Santa Clara
CA
95054
4085475000
MARC TAXAY
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
628
217633.40
314152875
08/01/2024
NYSE
Common
08/01/2024
Exercise of Stock Options
Issuer
N
628
08/01/2024
Cash
N
10b5-1 Sales Plan for MARC TAXAY
5453 Great America Parkway
Santa Clara
CA
95054
Common
07/01/2024
624
221339.04
10b5-1 Sales Plan for MARC TAXAY
5453 Great America Parkway
Santa Clara
CA
95054
Common
06/03/2024
4493
1327527.06
08/01/2024
09/13/2023
/s/ Marc Taxay