?? fras.htm
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<title>SNA通過幀中繼網</title>
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<p><font color="#008080" size="6"><em><strong><img
src="webimages/Sna_fr.GIF" width="300" height="64"></strong></em></font></p>
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<td><p align="right">幀中繼具有的高<br>
速,低時延特性<br>
非常適合對時間<br>
敏感性很高的<br>
SNA網傳輸.這一<br>
章我們將介紹SNA<br>
數據透過幀中繼<br>
網傳輸.包括為什<br>
么用幀中繼傳輸<br>
SNA數據,好處,<br>
FEP Centric中<br>
BNN和BAN的概念<br>
及不同<br>
Router/FRAD <br>
Centric的實現.<br>
最后舉例說明<br>
它們配置.</p>
</td>
<td> </td>
<td> </td>
<td><ul>
<li><a href="#pp1"><font color="#008080">介紹SNA透過幀中繼傳輸</font></a><ul>
<li><a href="#pp2"><font color="#008080">為什么用幀中繼傳輸SNA數據</font></a></li>
<li><a href="#pp3"><font color="#008080">RFC
1490</font></a></li>
</ul>
</li>
<li><a href="#pp4"><font color="#008080">路由器透過幀中繼網訪問前端處理器</font></a><ul>
<li><a href="#pp5"><font color="#008080">幀中繼邊界網絡節點(BNN)</font></a></li>
<li><a href="#pp6"><font color="#008080">幀中繼邊界訪問節點(BAN)</font></a></li>
</ul>
</li>
<li><a href="#pp7"><font color="#008080">路由器作FRAD設備訪問前端處理器或Cisco
CIP卡</font></a></li>
<li><a href="#pp8"><font color="#008080">監控信息</font></a></li>
<li><a href="#pp9"><font color="#008080">配置實例</font></a></li>
</ul>
</td>
</tr>
</table>
<hr>
<p><a name="pp1"></a><font color="#008080" size="4"><em><strong>介紹SNA透過幀中繼傳輸</strong></em></font></p>
<p>幀中繼具有的高速,低時延特性非常適合對時間敏感性很高的SNA網傳輸.這一章我們將介紹SNA數據透過幀中繼網傳輸.包括為什么用幀中繼傳輸SNA數據,好處,FEP
Centric中BNN和BAN的概念及不同Router/FRAD Centric的實現.最后舉例說明它們配置.</p>
<p><a name="pp2"></a><font color="#808080"><em><strong>為什么用幀中繼傳輸SNA數據</strong></em></font></p>
<p>幀中繼具有的高速,低時延特性非常適合對時間敏感性很高的SNA網傳輸.大家知道,SNA是發輪詢信息確定下面PU設備是否處于激活狀態的,由于網絡數率,沖突等引起時延而使輪詢應答超時是不必要的.幀中繼另外提供許多好處為SNA傳輸:</p>
<ul>
<li>多種協議(SNA,IP,IPX,...)在一個PVC中運行<br>
SNA,IP,IPX,...</li>
</ul>
<ul>
<li>增強整體網絡性能<br>
用高速幀中繼鏈路代替低速專線.</li>
</ul>
<ul>
<li>降低網絡使用費用<br>
幀中繼價格較專線低.</li>
</ul>
<ul>
<li>未來升級容易<br>
IBM認可的易于升級到以后的ATM骨干網</li>
</ul>
<p><a name="pp3"></a><font color="#808080"><em><strong>RFC 1490</strong></em></font></p>
<p>RFC 1490定義了幀中繼端到端的多協議打包方式.它支持SNA使用LLC2打包,實現鏈路層的排隊,應答和流量控制.Cisco
IOS軟件和NCP支持兩種幀格式:</p>
<ul>
<li>RFC 1490 routed format for LLC2,在幀中繼論壇FRF.3中詳細說明,NCP端作BNN(Frame
Relay Boundary Network Node).需要NCP 7.1以上才支持.</li>
</ul>
<ul>
<li>RFC 1490 802.5 source-route bridged format,作BAN(Frame
Relay Boundary Access Node).需要NCP 7.3以上才支持.</li>
</ul>
<p><strong>RFC 1490 Routed Format for LLC2(BNN)</strong></p>
<p><img src="gif/s3217.gif" width="415" height="47"></p>
<p><strong>RFC 1490 Bridged Frame Format</strong></p>
<p><img src="gif/h7115.gif" width="328" height="293"></p>
<hr>
<p><a name="pp4"></a><font color="#008080" size="4"><em><strong>路由器透過幀中繼網訪問前端處理器(FEP
Centric)</strong></em></font></p>
<p><strong>FEP Centric</strong>指的是路由器在遠端,透過幀中繼網訪問大機的前端處理器.可以實現多個協議在一條PVC中運行,線路費用也大大降低.</p>
<p><a name="pp5"></a><font color="#808080"><em><strong>幀中繼邊界網絡節點(BNN)</strong></em></font></p>
<p>RFC 1490支持用LLC打包方式傳輸SNA數據,提供鏈路層次序,應答和流量控制.</p>
<p>相關的命令:</p>
<table border="2" bordercolordark="#808080"
bordercolorlight="#808080">
<tr>
<td>功能</td>
<td>命令</td>
</tr>
<tr>
<td>與一個幀中繼DLCI的LLC連接</td>
<td><font face="Times New Roman"><strong>fras map llc</strong>
<em>mac-address lan-lsap lan-rsap</em> <strong>serial</strong>
<em>port</em> <strong>frame-relay</strong> <em>dlci
fr-lsap fr-rsap</em> [<strong>pfid2</strong> | <strong>afid2</strong>
| <strong>fid4</strong>] </font></td>
</tr>
<tr>
<td>與一個幀中繼DLCI的SDLC連接</td>
<td><font face="Times New Roman"><strong>fras map sdlc</strong>
<em>sdlc-address </em><strong>serial</strong> <em>port </em><strong>frame-relay</strong>
<em>dlci fr-lsap fr-rsap</em> [<strong>pfid2</strong> | <strong>afid2</strong>
| <strong>fid4</strong>] </font></td>
</tr>
</table>
<p>請看配置實例"<a href="#pp11"><font color="#00FF00">BNN
Configuration (LAN) Sample</font></a>"和"<a
href="#pp15"><font color="#00FF00">BNN Configuration (SDLC)
Sample</font></a>".</p>
<p><a name="pp6"></a><font color="#808080"><em><strong>幀中繼邊界訪問節點(BAN)</strong></em></font></p>
<p>BAN(Boundary Access Node)簡化了路由器配置,當PU遷移,網卡變動不必象BNN那樣改變路由器配置.</p>
<p>相關的命令:</p>
<table border="2" bordercolordark="#808080"
bordercolorlight="#808080">
<tr>
<td>功能</td>
<td>命令</td>
</tr>
<tr>
<td>幀中繼BAN配置</td>
<td><font face="Times New Roman"><strong>fras ban</strong>
l<em>ocal-ring bridge-number ring-group ban-dlci-mac</em>
<strong>dlci</strong> <em>dlci#1 [dlci#2 . . . dlci#5] </em>[<strong>bni</strong>
<em>mac-addr</em>] </font></td>
</tr>
</table>
<p>請看配置實例"<a href="#pp12"><font color="#00FF00">BAN
Configuration (LAN) Sample</font></a>"和"<a
href="#pp16"><font color="#00FF00">BAN Configuration (SDLC)
Sample</font></a>".</p>
<hr>
<p><a name="pp7"></a><font color="#008080" size="4"><em><strong>路由器作FRAD設備訪問前端處理器或Cisco
CIP卡</strong></em></font></p>
<p>我們可以用路由器作FRAD設備,串口直接連到幀中繼網上,訪問前端處理器或Cisco
CIP卡.</p>
<p>相關的命令:</p>
<table border="2" bordercolordark="#808080"
bordercolorlight="#808080">
<tr>
<td>功能</td>
<td>命令</td>
</tr>
<tr>
<td>指定DLSW+ remote peer</td>
<td><strong>dlsw remote-peer </strong><em>list-number </em><strong>frame-relay
interface serial </strong><em>number dlci-number</em></td>
</tr>
<tr>
<td>定義DLSw+和DLCI映射</td>
<td><strong>frame-relay map llc2 </strong><em>dlci-number</em></td>
</tr>
</table>
<p>請看"<a href="#pp13"><font color="#00FF00">DLSw+ Lite
Configuration Sample</font></a>"配置實例,具體請參閱<font
color="#00FF00"> </font><a href="dlsw.htm"><font color="#00FF00">DLSw+設計向導</font></a>.</p>
<p> </p>
<hr>
<p><a name="pp8"></a><font color="#008080" size="4"><em><strong>監控信息</strong></em></font></p>
<p>用show和debug監控網絡信息.</p>
<ul>
<li><font face="Times New Roman"><em><strong>show fras</strong></em></font></li>
<li><font face="Times New Roman"><em><strong>show frame-relay
pvc</strong></em></font></li>
<li><font face="Times New Roman"><em><strong>show llc2</strong></em></font></li>
<li><font face="Times New Roman"><em><strong>debug
frame-relay llc</strong></em></font></li>
</ul>
<hr>
<p><a name="pp9"></a><font color="#008080" size="4"><em><strong>配置實例</strong></em></font></p>
<ul>
<li><a href="#pp10"><font color="#008080">LAN to Frame Relay</font></a><ul>
<li><a href="#pp11"><font color="#008080">BNN
Configuration(LAN)</font></a></li>
<li><a href="#pp12"><font color="#008080">BAN
Configuration(LAN)</font></a></li>
</ul>
</li>
<li><a href="#pp13"><font color="#008080">DLSw+ Lite
Configuration</font></a></li>
<li><a href="#pp14"><font color="#008080">SDLC to Frame Relay</font></a><ul>
<li><a href="#pp15"><font color="#008080">BNN
Configuration(SDLC)</font></a></li>
<li><a href="#pp16"><font color="#008080">BAN
Configuration(SDLC)</font></a></li>
</ul>
</li>
</ul>
<p><a name="pp10"></a><font color="#808080"><em><strong>LAN to
Frame Relay</strong></em></font></p>
<p><font color="#000000"><strong><img src="gif/s3219.gif"
width="461" height="170"></strong></font></p>
<p><a name="pp11"></a><font color="#000000"><strong>BNN
Configuration(LAN):</strong></font></p>
<p>interface tokenring 0<br>
no ip address<br>
no keepalive<br>
ring-speed 16<br>
fras map llc 0800.5a8f.8802 4 4 serial 0 frame-relay 16 4 4<br>
fras map llc 0800.5a8f.8804 4 4 serial 0 frame-relay 16 8 4<br>
fras map llc 0800.5a8f.8806 4 4 serial 0 frame-relay 17 4 4<br>
!<br>
interface serial 0<br>
mtu 2500<br>
no ip address<br>
encapsulation frame-relay IETF<br>
keepalive 12<br>
frame-relay lmi-type ansi<br>
frame-relay map llc2 16<br>
frame-relay map llc2 17</p>
<p><a name="pp12"></a><font color="#000000"><strong>BAN
Configuration(LAN):</strong></font></p>
<p>source-bridge ring-group 33<br>
!<br>
interface serial 0<br>
mtu 4000<br>
encapsulation frame-relay ietf<br>
frame-relay lmi-type ansi<br>
frame-relay map llc2 16<br>
frame-relay map llc2 17<br>
fras ban 34 11 33 4000.3745.0001 dlci 16 17<br>
!<br>
interface tokenring 0<br>
ring-speed 16<br>
source-bridge 32 10 33</p>
<p><a name="pp13"></a><font color="#000000"><strong>DLSw+ Lite
Configuration:</strong></font></p>
<p><font color="#000000"><strong><img src="gif/s3704.gif"
width="544" height="146"></strong></font></p>
<p>source-bridge ring-group 100<br>
dlsw local-peer peer-id 1.1.1.1<br>
dlsw remote-peer 0 frame-relay interface serial 0 30<br>
!<br>
interface tokenring 0<br>
ring-speed 16<br>
source-bridge active 1 1 100<br>
!<br>
interface serial 0<br>
mtu 3000<br>
no ip address<br>
encapsulation frame-relay<br>
frame-relay lmi-type ansi<br>
frame-relay map llc2 30</p>
<p><a name="pp14"></a><font color="#808080"><em><strong>SDLC to
Frame Relay</strong></em></font></p>
<p><font color="#000000"><strong><img src="gif/s3220.gif"
width="409" height="116"></strong></font></p>
<p><a name="pp15"></a><font color="#000000"><strong>BNN
Configuration(SDLC):</strong></font></p>
<p>interface serial 1<br>
no ip address<br>
encapsulation sdlc<br>
no keepalive<br>
clockrate 56000<br>
sdlc address C1<br>
sdlc xid C1 05D01501<br>
sdlc role primary<br>
fras map sdlc C1 serial 0 frame-relay 16 4 4<br>
!<br>
interface serial 0<br>
mtu 2500<br>
no ip address<br>
encapsulation frame-relay ietf<br>
keepalive 12<br>
frame-relay lmi-type ansi<br>
frame-relay map llc2 16</p>
<p><a name="pp16"></a><font color="#000000"><strong>BAN
Configuration(SDLC):</strong></font></p>
<p>source-bridge ring-group 666<br>
!<br>
interface serial 1<br>
no ip address<br>
encapsulation sdlc<br>
no keepalive<br>
clockrate 56000<br>
sdlc role primary<br>
sdlc traddress 4000.1000.1111 110 5 666<br>
sdlc address C1<br>
sdlc xid C1 05D01501<br>
sdlc partner 4000.1000.222 C1<br>
!<br>
interface serial 0<br>
mtu 2500<br>
no ip address<br>
encapsulation frame-relay ietf<br>
keepalive 12<br>
frame-relay lmi-type ansi<br>
frame-relay map llc2 16<br>
fras ban 120 1 666 4000.1000.2222 dlci 16</p>
<hr>
<p><img src="zijin%20copywrite.GIF" width="600" height="48"></p>
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