There are some distribution test failures in Lithium SR4 related to L2SWITCH.

https://jenkins.opendaylight.org/releng/job/l2switch-csit-1node-switch-all-stable-lithium/606/

Please check current existing test plans here.

https://github.com/opendaylight/integration-test/blob/master/csit/testplans/l2switch-switch.txt

Seems there is a duplication of same test suites, Please check if they are necessary. If they are necessary then please try to fix and ensure no test failures on jenkins.