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                    <ccc>XXXXXXXX</ccc>
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            <liveTestFlag>LIVE</liveTestFlag>



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            <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>1999 MCCOOL FAMILY TRUST</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>2819</noOfUnitsSold>
            <aggregateMarketValue>520584.73</aggregateMarketValue>
            <noOfUnitsOutstanding>309581000</noOfUnitsOutstanding>
            <approxSaleDate>08/22/2023</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/20/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>2819</amountOfSecuritiesAcquired>
            <paymentDate>02/20/2022</paymentDate>
            <natureOfPayment>N/A</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>08/01/2023</saleDate>
            <amountOfSecuritiesSold>1008</amountOfSecuritiesSold>
            <grossProceeds>178456.32</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>07/03/2023</saleDate>
            <amountOfSecuritiesSold>996</amountOfSecuritiesSold>
            <grossProceeds>160694.64</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>06/01/2023</saleDate>
            <amountOfSecuritiesSold>1000</amountOfSecuritiesSold>
            <grossProceeds>165800.00</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>05/23/2023</saleDate>
            <amountOfSecuritiesSold>2824</amountOfSecuritiesSold>
            <grossProceeds>401219.80</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>08/22/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>09/01/2022</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ John  McCool Trustee</signature>
        </noticeSignature>
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144
0001701967
XXXXXXXX
LIVE
0001596532
ARISTA NETWORKS INC
001-36468
5453 Great America Parkway
Santa Clara
CA
95054
4085475000
1999 MCCOOL FAMILY TRUST
Officer
COMMON
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Fl.
New York
NY
10004
2819
520584.73
309581000
08/22/2023
NYSE
Common
02/20/2022
Restricted Stock Units
Issuer
N
2819
02/20/2022
N/A
N
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
08/01/2023
1008
178456.32
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
07/03/2023
996
160694.64
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
06/01/2023
1000
165800.00
10b5-1 Sales Plan for  1999 MCCOOL FAMILY TRUST
5453 Great America Parkway
Santa Clara
CA
95054
Common
05/23/2023
2824
401219.80
08/22/2023
09/01/2022
/s/ John  McCool Trustee