摘要
以往用软件升级来增加新的特性和能力或软件维护是导致网络系统中断的主要原因之一。以冗余路由器为例,设计了一种能在分布式网络设备上实现业务不中断的软件在线升级系统,利用不中断转发(NSF)、状态转换(SSO)、热补丁、进程间通信(IPC)和主控硬件冗余等现有成熟技术在用户流量不中断转发的情况下真正实现了软件在线升级和版本替换,在升级过程中涉及到兼容性检查,回滚定时器设计等内容,有效地解决或减少了软件升级带来的业务中断现象,进一步提高了网络设备的高可用性。
Today software upgrades to have new features or capabilities, or to keep maintenance which is still the primary cause to inaccessibility of network system. The design of In-Service Software Upgrade （ISSU） system of redundant route processors takes advantage of Nonstop Forwarding with Stateful Swit- chover（NSF/SSO）, patching, IPC and hardware redundance to permit true in-service software upgrades or version changes while continuously forwarding user traffic. In the upgrading process of the compatibility check and rollback timer design are considered. So the ISSU system have faster upgrades, minimal impact to service and higher availability.
出处
《计算机系统应用》
2010年第6期40-43,共4页
Computer Systems & Applications
