服务器线路单线、双线、三线以及BGP有何区别?

在IDC行业中,服务器的稳定性、安全性是考核服务商的主要指标,影响这两个指标的因素有很多,其中比较重要的有三个,分别是服务器的配置、机房骨干网宽带和机房的线路。我们今天来说说机房的线路是如何进行选择的。服务器线路有单线线路、双线线路、三线线路以及BGP线路之分。

1.单线

       我们通常用的机房线路有电信线路和联通线路,单线服务器是指IDC机房只接入一条线路,要么是电信机房,要么是联通机房。单线路机房的优势是带宽大、价格低、并且防御也高一些;劣势是电信用户访问网通网站或网通用户访问电信网站速度会很慢。通常用户在南方的选择电信,用户在北方的选择联通。如果企业的用户群体比较集中且流量非常大,比如基本都是北方用户或者某一个城市,可以考虑放在单线机房,便宜省钱。

2.双线

        双线服务器是指这个机房是由电信、联通两条线路同时接入的,拥有两个IP地址,然后通过路由器技术自动分辨访问者的线路,从而实现电信用户使用电信IP进网站,网通用户使用网通IP访问网站,从而解决了国内两大网络(电信和网通)之间的互联互通问题,提高网站打开速度。双线适合针对全国用户的网站,如商城类网站、门户型网站等。但是双线费用较高并且带宽较小,由于通常域名默认指向电信站,因此初次访问该站点的网通用户会很慢。

3.三线

三线通常是指接入电信、联通、移动三条线路(单网卡三IP)。三线路的覆盖面更广,在全国各地的用户访问速度都快,而且三线路集合了手机WIFI,对手机WIFI的访问速度比较快。

4.BGP线路

      采用BGP方案来实现电信/联通/移动 多线路互联的机房,我们称为BGP机房。BGP机房的优点:服务器只需要设置一个IP地址,不会占用服务器的任何系统资源。服务器的上行路由与下行路由都能选择最优的路径,所以能真正实现高速的单IP高速访问;可以实现路由的相互备份,一条线路出现故障时路由会自动切换到其它线路。BGP线路的缺点是贵,同样的机器和带宽比单线高出很多,带宽越大比例越大,而且出口带宽没有单线充足,一般的攻击能扛住,大流量如20G的网络就会丢包。

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