再问关于2900和vlan的问题!!!请帮帮我!!!

g00g

这是2900的配置:\r\n\r\nUsing 1511 out of 32768 bytes\r\n!\r\nversion 12.0\r\nno service pad\r\nservice timestamps debug uptime\r\nservice timestamps log uptime\r\nno service password-encryption\r\n!\r\nhostname SGZVOICE21\r\n!\r\nenable secret 5 $1$E1DC$gsEcnPHRfMcLX1v1GF07N/\r\n!\r\n!\r\n!\r\n!\r\n!\r\n!\r\nip subnet-zero\r\n!\r\n!\r\n!\r\ninterface FastEthernet0/1\r\n duplex half\r\n speed 10\r\n switchport access vlan 2\r\n spanning-tree portfast\r\n!\r\ninterface FastEthernet0/2\r\n!\r\ninterface FastEthernet0/3\r\n!\r\ninterface FastEthernet0/4\r\n!\r\ninterface FastEthernet0/5\r\n!\r\ninterface FastEthernet0/6\r\n!\r\ninterface FastEthernet0/7\r\n!\r\ninterface FastEthernet0/8\r\n!\r\ninterface FastEthernet0/9\r\n!\r\ninterface FastEthernet0/10\r\n!\r\ninterface FastEthernet0/11\r\n!\r\ninterface FastEthernet0/12\r\n!\r\ninterface FastEthernet0/13\r\n!\r\ninterface FastEthernet0/14\r\n!\r\ninterface FastEthernet0/15\r\n!\r\ninterface FastEthernet0/16\r\n!\r\ninterface FastEthernet0/17\r\n!\r\ninterface FastEthernet0/18\r\n!\r\ninterface FastEthernet0/19\r\n!\r\ninterface FastEthernet0/20\r\n!\r\ninterface FastEthernet0/21\r\n!\r\ninterface FastEthernet0/22\r\n!\r\ninterface FastEthernet0/23\r\n!\r\ninterface FastEthernet0/24\r\n switchport trunk encapsulation dot1q\r\n switchport mode trunk\r\n!\r\ninterface VLAN1\r\n ip address 192.168.107.121 255.255.255.0\r\n no ip directed-broadcast\r\n no ip route-cache\r\n!\r\ninterface VLAN2\r\n no ip directed-broadcast\r\n no ip route-cache\r\n shutdown\r\n!\r\nip default-gateway 192.168.107.213\r\nsnmp-server engineID local 0000000902000006D7813580\r\nsnmp-server community private RW\r\nsnmp-server community public RO\r\n!\r\nline con 0\r\n transport input none\r\n stopbits 1\r\nline vty 0 4\r\n password password\r\n login\r\nline vty 5 15\r\n password password\r\n login\r\n!\r\nend\r\n我的voip设备接在2900的第一口,走vlan2\r\n这台2900上联3550通过光纤接到机房,机房里有三台2950,上面接的voip设备走vlan2都可以用了,另外一个地方也有一套2950上联3550通过光纤接到机房,这个2950上的voip设备也走vlan2可以使用没问题.\r\n我不明白为什么2900上就不行?是否有些地方和2950不一样?\r\n\r\n现在我的电脑在2900上可以ping到我的dhcp server,但是2900上的voip设备就是不能从dhcp server获得ip address,这是为什么呢?\r\n我试过在vlan 2中作ip help-address指向我的dhcp server也不行.我其它的2950上也没做这个.\r\n\r\n真是伤脑筋,请各位帮帮忙,我已经被这个问题困扰好些天了?

zujuhu

我也不知道,解决了发个贴告诉我们怎么解决的

g00g

现在问题的得到了解决,但是为什么呢?\r\n\r\n我把一端口改称如下配置:\r\n\r\nsw trunk enc dot1\r\nsw mode trunk\r\nsw trunk native vlan 2\r\n\r\n我的voip设备终于可以使用了,但是为什么原来不行,我还是不明白,哪位高手能够指点以下谜精.