|  | @@ -1321,10 +1321,12 @@ void XdsLb::ProcessChannelArgsLocked(const grpc_channel_args& args) {
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				|  |  |  
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				|  |  |  void XdsLb::UpdateLocked(const grpc_channel_args& args) {
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				|  |  |    ProcessChannelArgsLocked(args);
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				|  |  | -  // Note: We have disabled fallback mode in the code, so we don't need to
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				|  |  | -  // handle fallback address changes.
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				|  |  | +  // Update the existing RR policy.
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				|  |  | +  // Note: We have disabled fallback mode in the code, so this RR policy must
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				|  |  | +  // have been created from a serverlist.
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				|  |  |    // TODO(vpowar): Handle the fallback_address changes when we add support for
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				|  |  |    // fallback in xDS.
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				|  |  | +  if (rr_policy_ != nullptr) CreateOrUpdateRoundRobinPolicyLocked();
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				|  |  |    // Start watching the LB channel connectivity for connection, if not
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				|  |  |    // already doing so.
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				|  |  |    if (!watching_lb_channel_) {
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