[求助]什么是路由型城域网和交换型城域网？

狐一郎

&nbsp; 今天看一篇资料文章的时候提到：<div vshape="_x0000_s1026"><div class="O" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 110%; COLOR: #6f89f7; FONT-FAMILY: Wingdings; mso-special-format: bullet; mso-bullet-image: 'C:
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lip_image001.gif'; mso-color-index: 6;"></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>路由型城域网（如：长沙） </b></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>出口和核心层采用路由器组网 </b></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>三层交换机兼作二层汇接、三层接入和三层汇接 </b></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>BRAS</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>旁挂三层交换机，作</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>PPoE</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>接入 </b></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>部分专设</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>MPLS PE</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>，旁挂三层交换机或旁挂</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>GSR </b></span></div><div class="O" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b></b></span></div><div class="O" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 110%; COLOR: #6f89f7; FONT-FAMILY: Wingdings; mso-special-format: bullet; mso-bullet-image: 'C:
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lip_image001.gif'; mso-color-index: 6;"></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b></b></span></div><div class="O" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>交换型城域网（省内其它本地网） </b></span></div><span style="FONT-FAMILY: Tahoma;"><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>无出口路由器，城域网作为</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>ChinaNet</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>的本地延伸网络</b></span></div></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>无出口路由器，城域网作为</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>ChinaNet</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>的本地延伸网络</b></span><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>三层交换机组成城域网网络核心 </b></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: Tahoma;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>三层交换机兼作二层汇接、三层接入和三层汇接 </b></span></div><span style="FONT-FAMILY: Tahoma;"><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-SIZE: 60%; LEFT: -4.16%; FONT-FAMILY: Wingdings; POSITION: absolute; TOP: 0.61em; mso-special-format: bullet;">n</span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>BRAS</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>旁挂三层交换机，作</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>PPoE</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>接入 </b></span></div></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>BRAS</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>旁挂三层交换机，作</b></span><span lang="EN-US" style="FONT-FAMILY: Tahoma; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman'; mso-fareast-language: ZH-CN;"><b>PPoE</b></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><b>接入 </b></span><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><strong></strong></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><strong></strong></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><strong></strong></span></div><div class="O1" style="mso-line-spacing: '100 20 0'; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: 'Times New Roman';"><strong><font color="#ff0000">两者有什么区别和联系?</font></strong></span></div><div class="O1" style="mso-line-spacing: &quot;100 20 0&quot;; mso-margin-left-alt: 468; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Tahoma; mso-fareast-font-family: 宋体; mso-hansi-font-family: &quot;Times New Roman&quot;;"></span></div><div class="O" style="TEXT-ALIGN: center; mso-line-spacing: &quot;100 50 0&quot;; mso-margin-left-alt: 216; mso-char-wrap: 1; mso-kinsoku-overflow: 1;"></div></div>

[此贴子已经被编辑于2007-6-1 11:05:25编辑过]