After boot, why do I need to restart networking to bring my network interfaces online?

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在Red Hat Enterprise Linux系统启动后，若网络接口未能自动上线，需手动重启网络服务。此问题常见于手动管理的网络交换机环境中。解决方案为确保交换机启用快速模式，以允许网络初始化过程提前进行，避免因交换机延迟导致网络连接失败。

After boot, why do I need to restart networking to bring my network interfaces online?

SOLUTION 已验证 - 已更新 2014年七月18日17:18 -

English

环境

Red Hat Enterprise Linux
Manually managed network switch

问题

When booting a system running Red Hat Enterprise Linux, the system will be unable to connect to the network or obtain an IP address until the interface is restarted either by a service network restart or ifup ethX, where X is equivalent to the number of the interface.

决议

Ensure that portfast mode has been enabled on the switch. If it is not, enable it - typically during the boot process the network initialization process occurs earlier than the switch will allow traffic to pass through to other hosts, and therefore fails before any network connectivity is established. With portfast mode enabled, the switch will allow traffic to flow at a faster rate.
To configure your switch to allow this, please refer to your switch's documentation or support organization.

诊断步骤

Assuming Cisco IOS, you can check from the switch the portfast mode which should have similar output:

Raw

Port      Vlan  Port-State     Cost   Priority  Fast-Start  Group-Method
--------  ----  -------------  -----  --------  ----------  ------------
 0/1      1     forwarding        19        32  disabled