核心和(hé)樓層交換機都是傻瓜型的，不能配置。 
網關在AR路由器(qì)上(shàng)，用戶均通(tōng)過傻瓜路由器(qì)接入，傻瓜路由器(qì)均為tp-link類型的，傻瓜路由器(qì)的IP分為兩個(gè)網段，分别為190.131.1.0/16和(hé)190.131.3.0/16，傻瓜路由器(qì)下面的用戶通(tōng)過DHCP獲得(de)IP，并通(tōng)過傻瓜路由器(qì)自帶的NAT功能轉換IP後接入網絡。 

問題： 
AR2240 下面的內(nèi)網段有(yǒu)時(shí)不能正常訪問外網 

查看cpu-defend，發現有(yǒu)丢包 
display cpu-defend statistic 
----------------------------------------------------------------------- 
Packet Type               Pass Packets        Drop Packets 
----------------------------------------------------------------------- 
8021X                                0                   0 
arp-miss                          5744                   0 
arp-reply                         3903                   0 
arp-request                     448252                1390 
bfd                                  0                   0 

查看trapbuffer，發現有(yǒu)ARP沖突 
#Dec  9 2014 10:09:34+00:00 253_HW_AR2240 ARP/4/ARP_IPCONFLICT_TRAP:OID 1.3.6.1.4.1.2011.5.25.123.2.6 ARP detects IP conflict. (IP address=190.131.3.131, Local interface=GigabitEthernet0/0/1, Local MAC=0017-59de-b688, Local vlan=0, Local CE vlan=0, Receive interface=GigabitEthernet0/0/1, Receive MAC=78a1-067c-7dc1, Receive vlan=0, Receive CE vlan=0, IP conflict type=Remote IP conflict). 
#Dec  9 2014 10:01:44+00:00 253_HW_AR2240 ARP/4/ARP_IPCONFLICT_TRAP:OID 1.3.6.1.4.1.2011.5.25.123.2.6 ARP detects IP conflict. (IP address=190.131.3.130, Local interface=GigabitEthernet0/0/1, Local MAC=0017-59de-b688, Local vlan=0, Local CE vlan=0, Receive interface=GigabitEthernet0/0/1, Receive MAC=78a1-067c-7dbb, Receive vlan=0, Receive CE vlan=0, IP conflict type=Remote IP conflict). 
#Dec  9 2014 09:49:28+00:00 253_HW_AR2240 ARP/4/ARP_IPCONFLICT_TRAP:OID 1.3.6.1.4.1.2011.5.25.123.2.6 ARP detects IP conflict. (IP address=190.131.3.131, Local interface=GigabitEthernet0/0/1, Local MAC=0017-59de-b688, Local vlan=0, Local CE vlan=0, Receive interface=GigabitEthernet0/0/1, Receive MAC=78a1-067c-7dc1, Receive vlan=0, Receive CE vlan=0, IP conflict type=Remote IP conflict). 
#Dec  9 2014 09:34:04+00:00 253_HW_AR2240 ARP/4/ARP_IPCONFLICT_TRAP:OID 1.3.6.1.4.1.2011.5.25.123.2.6 ARP detects IP conflict. (IP address=190.131.3.133, Local interface=GigabitEthernet0/0/1, Local MAC=7427-eae4-275b, Local vlan=0, Local CE vlan=0, Receive interface=GigabitEthernet0/0/1, Receive MAC=0017-59de-b688, Receive vlan=0, Receive CE vlan=0, IP conflict type=Remote IP conflict). 

查看ARP表 
<253_HW_AR2240> 
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE 
                                          VLAN/CEVLAN PVC                    
190.131.1.107   0014-5e7a-75b4  20        D-0         GE0/0/1 
190.131.3.121   0017-59de-b688  2         D-0         GE0/0/1 
190.131.1.112   cc34-2999-9bbf  17        D-0         GE0/0/1 
190.131.3.120   7427-eae4-275b  20        D-0         GE0/0/1 
190.131.1.109   0014-5e19-a483  13        D-0         GE0/0/1 
190.131.1.199   d815-0d38-3d3d  3         D-0         GE0/0/1 
190.131.1.101   0014-5e7a-7574  19        D-0         GE0/0/1 
190.131.1.206   0022-3fa5-b237  4         D-0         GE0/0/1 
190.131.3.6     0017-59de-b688  18        D-0         GE0/0/1 
190.131.1.6     90fb-a61e-13e5  16        D-0         GE0/0/1 //這個(gè)是正常的傻瓜路由器(qì)的MAC 
190.131.1.233   7427-ea3d-e4ef  20        D-0         GE0/0/1 
190.131.1.130   0060-6e9a-0d23  2         D-0         GE0/0/1 //這個(gè)應該是正常的傻瓜路由器(qì)的MAC 
190.131.1.50    4437-e676-91aa  2         D-0         GE0/0/1 
190.131.3.130   0017-59de-b688  17        D-0         GE0/0/1 
190.131.3.132   0021-272e-eb43  14        D-0         GE0/0/1 
190.131.3.131   0017-59de-b688  5         D-0         GE0/0/1 
190.131.3.133   0017-59de-b688  10        D-0         GE0/0/1