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    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001701967</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <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>JOHN F MCCOOL &amp; JUDY BUCCI-MCCOOLCO-TTEE 1999 MCCOOL FAMILY TRUSTU/DEC DTD 04/06/1999</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>38th Fl.</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>1144</noOfUnitsSold>
            <aggregateMarketValue>246291.76</aggregateMarketValue>
            <noOfUnitsOutstanding>311100142</noOfUnitsOutstanding>
            <approxSaleDate>12/08/2023</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>12/08/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1000</amountOfSecuritiesAcquired>
            <paymentDate>12/08/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/15/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Employee Stock Purchase Plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>144</amountOfSecuritiesAcquired>
            <paymentDate>02/15/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>11/21/2023</saleDate>
            <amountOfSecuritiesSold>2831</amountOfSecuritiesSold>
            <grossProceeds>610243.57</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>11/01/2023</saleDate>
            <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
            <grossProceeds>202930.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST</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>10/02/2023</saleDate>
            <amountOfSecuritiesSold>996</amountOfSecuritiesSold>
            <grossProceeds>183781.92</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The securities to be sold were acquired upon the vesting of restricted stock units during the period of 02/15/2023 through 08/15/2023
</remarks>
        <noticeSignature>
            <noticeDate>12/08/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/08/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ John F McCool</signature>
        </noticeSignature>
    </formData>
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144
0001701967
XXXXXXXX
LIVE
0001596532
ARISTA NETWORKS INC
001-36468
5453 Great America Parkway
Santa Clara
CA
95054
4085475000
JOHN F MCCOOL & JUDY BUCCI-MCCOOLCO-TTEE 1999 MCCOOL FAMILY TRUSTU/DEC DTD 04/06/1999
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
1144
246291.76
311100142
12/08/2023
NYSE
Common
12/08/2023
Exercise of Stock Options
Issuer
N
1000
12/08/2023
Cash
Common
02/15/2023
Employee Stock Purchase Plan
Issuer
N
144
02/15/2023
Cash
N
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
11/21/2023
2831
610243.57
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
11/01/2023
1000
202930.00
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
10/02/2023
996
183781.92
The securities to be sold were acquired upon the vesting of restricted stock units during the period of 02/15/2023 through 08/15/2023
12/08/2023
09/08/2023
/s/ John F McCool