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手机从vlan23上来后一直获取不到地址,但是该vlan下别的终端可以正常拿到地址,故障终端的MAC地址是f0db-e2a5-c235
根据现场的故障现象,我们怀疑是DHCP的问题,在设备上debugging dhcp server all,我们看到
*Nov 22 16:07:07:457 2018 core_7503E DHCPS/7/PACKET:
From 0.0.0.0 port 68, interface Vlan-interface23
Message type: REQUEST (1)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 3566393750
Seconds: 0, Broadcast flag: 0
Client IP address: 0.0.0.0 Your IP address: 0.0.0.0
Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0
Client hardware address: f0db-e2a5-c235
Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPDISCOVER (1)
*Nov 22 16:07:08:040 2018 core_7503E DHCPS/7/PACKET:
To 10.74.104.221 port 68, interface Vlan-interface23
Message type: REPLY (2)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 3566393750
Seconds: 0, Broadcast flag: 0
Client IP address: 0.0.0.0 Your IP address: 10.74.104.221 //VLAN27
Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0
Client hardware address: f0db-e2a5-c235
Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPOFFER (2)
*Nov 22 16:07:09:098 2018 core_7503E DHCPS/7/PACKET:
From 0.0.0.0 port 68, interface Vlan-interface23
Message type: REQUEST (1)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 3566393750
Seconds: 2, Broadcast flag: 0
Client IP address: 0.0.0.0 Your IP address: 0.0.0.0
Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0
Client hardware address: f0db-e2a5-c235
Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPREQUEST (3)
*Nov 22 16:07:09:099 2018 core_7503E DHCPS/7/PACKET:
To 255.255.255.255 port 68, interface Vlan-interface23
Message type: REPLY (2)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 3566393750
Seconds: 2, Broadcast flag: 1
Client IP address: 0.0.0.0 Your IP address: 0.0.0.0
Server IP address: 10.74.102.126 Relay agent IP address: 0.0.0.0
Client hardware address: f0db-e2a5-c235
Server host name: not configured
Boot file name: not configured
查看75E上DHCP的交互过程,终端从VLAN 23 上请求DHCPDISCOVER (1) ,设备侧给终端回复的地址也是从VLAN 23 下发的,但是回复的地址确是VLAN 27的地址,这就导致终端获取不到地址,从而关联失败。 通过命令dis dhcp server free-ip查看,地址池中还有剩余地址。
后续研究得知,当终端上线的VLAN上的IP超期后,如果其他VLAN上有address range配置,并且有租约记录,那么会分配其他VLAN的租约地址。
如果VLAN都配置了address range或都没有配置,则不会触发这个问题。
这种属于软件问题,在7568P01及之后的版本解决, 升级到7577P02版本。
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