svn: Is there a way to avoid extraneous re-loading of externals?

When I do an svn update, it reloads all the externals, even though I've given them all an explicit开发者_运维知识库 revision in svn:externals, and I haven't modified this property or the files in question.

Is there a way to stop this from happening?

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Should be quite simply:

svn update --ignore-externals

svn help update has additional information on other parameters.