azurelinuxagent/common/osutil/redhat.py [254:263]:
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        for attempt in range(1, retry_limit):
            return_code = shellutil.run("ip link set {0} down && ip link set {0} up".format(ifname))
            if return_code == 0:
                return
            logger.warn("failed to restart {0}: return code {1}".format(ifname, return_code))
            if attempt < retry_limit:
                logger.info("retrying in {0} seconds".format(wait))
                time.sleep(wait)
            else:
                logger.warn("exceeded restart retries")
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azurelinuxagent/common/osutil/ubuntu.py [172:181]:
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        for attempt in range(1, retry_limit):
            return_code = shellutil.run("ip link set {0} down && ip link set {0} up".format(ifname))
            if return_code == 0:
                return
            logger.warn("failed to restart {0}: return code {1}".format(ifname, return_code))
            if attempt < retry_limit:
                logger.info("retrying in {0} seconds".format(wait))
                time.sleep(wait)
            else:
                logger.warn("exceeded restart retries")
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