Github user miguelaferreira commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1094#discussion_r46264185
  
    --- Diff: api/src/com/cloud/network/Networks.java ---
    @@ -251,6 +252,10 @@ public static URI fromString(String candidate) {
                     if 
(com.cloud.dc.Vlan.UNTAGGED.equalsIgnoreCase(candidate)) {
                         return Native.toUri(candidate);
                     }
    +                if (UuidUtils.validateUUID(candidate)){
    +                    //Supporting lswitch uuid as vlan id: set 
broadcast_uri = null and add row on nicira_nvp_router_map with 
logicalrouter_uuid = candidate
    +                    return null;
    --- End diff --
    
    One other thing, isn't there a method that validates a UUID? 
    
    Maybe I'm missing something, but wound't 
`UuidUtils.validateUUID(candidate)` tell you if candidate is a UUID or not?
    If so, why not use that instead of the construction with `try { 
Long.parse(...); } catch (NumberFormatException nfe) { (...) }`?


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