二层交换机上为什么没有arp表 二层交换机在工作的时候是不是需要用到ARP协议？
\u4e8c\u5c42\u4ea4\u6362\u673a\u4e0a\u4e3a\u4ec0\u4e48\u6ca1\u6709arp\u8868\uff1f\u4e09\u5c42\u4ea4\u6362\u53ef\u4ee5dis arp \u4e3a\u4ec0\u4e48\u662f\u4ea4\u6362\u673a\u90fd\u6709ARP\u8868\uff0c
Shanghai-SW2#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.10.1 0 0019.565f.9820 ARPA Vlan1
Internet 10.10.10.17 - d4a0.2af3.7640 ARPA Vlan1
Internet 10.10.10.43 0 406c.8f27.bbef ARPA Vlan1
Internet 10.10.10.59 0 3c97.0e1c.9276 ARPA Vlan1
Shanghai-SW2#ping 10.10.10.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.10.10.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/203/1007 ms
Shanghai-SW2#show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.10.8 0 000c.295e.0253 ARPA Vlan1
Internet 10.10.10.1 0 0019.565f.9820 ARPA Vlan1
Internet 10.10.10.17 - d4a0.2af3.7640 ARPA Vlan1
Internet 10.10.10.43 0 406c.8f27.bbef ARPA Vlan1
Internet 10.10.10.59 0 3c97.0e1c.9276 ARPA Vlan1
Shanghai-SW2#
\u4e8c\u5c42\u4ea4\u6362\u673a\u7684\u662f\u6839\u636eMAC\u5730\u5740\u6765\u8f6c\u53d1\u6570\u636e\u5305,\u4e0d\u5b58\u5728ARP\u534f\u8bae\u5904\u7406\u7684\u95ee\u9898\u3002
\u4f17\u6240\u5468\u77e5\uff0c\u4e8c\u5c42\u4ea4\u6362\u673a\u5c5e\u4e8e\u5c42\u4e8c\u8bbe\u5907\uff0c\u800c\u5c42\u4e8c\u8bbe\u5907\u7684\u7279\u70b9\u662f\u4e0d\u9700\u8981\u7406\u89e3\u4e09\u5c42Ip\u53ca\u4e0a\u5c42\u534f\u8bae\u7684\u3002\u7b80\u5355\u7406\u89e3\u4e3a\uff1a\u5f53\u4e00\u4e2a\u6570\u636e\u5305\u4ece\u4ea4\u6362\u673a\u7684\u4e00\u4e2a\u63a5\u53e3\u63a5\u6536\u65f6\uff0c\u5b83\u4e0d\u4f1a\u67e5\u770b\u4f60\u7684IP\u53ca\u4e0a\u5c42\u534f\u8bae\u7528\u7684\u662f\u4ec0\u4e48\uff0c\u4f46\u5b83\u4f1a\u68c0\u67e5\u6570\u636e\u5305\uff08\u786e\u5207\u7684\u8bf4\u662f\u6570\u636e\u5e27\uff09\u7684\u6e90\u4e0e\u76ee\u6807MAC\uff0c\u7136\u540e\u5b83\u4f1a\u7ef4\u62a4\u4e00\u5f20\u7528\u4e8e\u6570\u636e\u5e27\u5728\u5e7f\u64ad\u73af\u5883\u7684\u7f51\u7edc\u8f6c\u53d1\u8868\uff08\u719f\u79f0MAC\u5730\u5740\u8868\uff09\u3002MAC\u5730\u5740\u8868\u4e2d\u8bb0\u5f55\u7740\u4e3b\u673aMAC\u5730\u5740\u4e0e\u5b83\u76f8\u8fde\u63a5\u53e3\u7684\u5bf9\u5e94\u5173\u7cfb\u3002
\u5728\u4ea4\u6362\u673a\u4e0a\u7528show mac-address-table\u53ef\u4ee5\u770b\u5230\u4ee5\u4e0b\u4fe1\u606f\uff1a
vlan id mac address type ports
1\u62162... XX.XX.XX.XX.XX.XX DYNAMIC\u6216STATIC \u76f8\u5e94\u7684\u63a5\u6536\u7aef\u53e3\u53f7
\u4f46\u4ea4\u6362\u673a\u4f1a\u4e0d\u4f1a\u5b58\u5728ARP\u8868\u5462\uff1f\u7b54\u6848\u662f\u4e0d\u786e\u5b9a\u7684\u3002
arp\u5730\u5740\u89e3\u6790\u534f\u8bae\uff08Address Resolution Protocol\uff09\uff1b\u5b83\u7684\u4f5c\u7528\u662f\u901a\u8fc7IP\u5730\u5740\u6765\u89e3\u91caMAC\u5730\u5740\u7684\u4e00\u4e2a\u4e09\u5c42\u534f\u8bae\uff082.5\u5c42\uff09\u3002\u6240\u4ee5\u4ea4\u6362\u673a\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u4e0d\u4f1a\u5b58\u5728ARP\u8868\u7684\u3002\u4e0d\u8fc7\u6709show arp\u8fd9\u4e2a\u547d\u4ee4\uff0c\u4f46\u91cc\u9762\u4ec0\u4e48\u5185\u5bb9\u90fd\u6ca1\u6709\u3002
\u5f53\u4e8c\u5c42\u4ea4\u6362\u673a\u914d\u7f6e\u4e86VLAN\u7ba1\u7406IP\u540e\uff0c\u5c31\u4f1a\u4ea7\u751fARP\u8868\u4e86
\u8868\u7684\u683c\u5f0f\u4e3a\uff1a#SHOW ARP
protocl address age(min) hardware addr type interface
internet 192.168.0.2 - XX.XX.XX.XX.XX.XX ARPA VLAN ID
\u6ce8\uff1a\u6b64\u8868\u4e2d\u53ea\u8bb0\u5f55\u6240\u6709IP\u8bbf\u95eeVLAN IP\u8fd9\u4e2a\u5730\u5740\u7684\u76f8\u5173\u4fe1\u606f\u3002
\u8def\u7531\u5668\u4e0a\u4e5f\u4f1a\u6709ARP\u8868\u7684\u5b58\u5728\uff0c\u8868\u7684\u683c\u5f0f\u8ddf\u4ea4\u6362\u673a\u4e00\u6837\uff1a
protocl address age(min) hardware addr type interface
internet 192.168.0.3 - XX.XX.XX.XX.XX.XX ARPA fastethernet0/1
\u6ce8\uff1a\u6b64\u8868\u4e2d\u8bb0\u5f55\u4e86\u6240\u6709IP\u8fdb\u5165\u6b64\u7aef\u53e3\uff08fastethernet0/1 \uff09\u7684\u76f8\u5173\u4fe1\u606f\u3002
\u90a3\u4e2aage timer\u53ef\u4ee5\u8bbe\u7f6e\u7684\uff0c\u9ed8\u8ba4\u751f\u5b58\u5468\u671f\u597d\u50cf\u5f88\u957f\uff08\u542c\u8bf4\u662f4\u5c0f\u65f6\uff0c\u4e0d\u786e\u5b9a\uff09\uff0c\u53ef\u4ee5\u8fdb\u5165VLAN\u63a5\u53e3\u6a21\u5f0f\u4e0b\u6539
\uff08vlan\uff09#arp timeout xxxx(\u5355\u4f4ds)\u3002
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