H3C S5560关于无线dhcp第二地址池不分配的问题请教

地址池里面配置了sub,也添加了secondary,但是到客户端把91段获取完之后，就获取不到地址了，没有办法获取到99的地址段，我测试了一下，我手动设置99段可以上网，求大神指教

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 version 7.1.070, Release 6328P03

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 sysname 办公CORE-5560

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 telnet server enable

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 irf mac-address persistent timer

 irf auto-update enable

 undo irf link-delay

 irf member 1 priority 1

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 dhcp enable

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 lldp global enable

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 password-recovery enable

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vlan 1

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vlan 88 to 95

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 stp global enable

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dhcp server ip-pool vlan89

 gateway-list 192.168.89.254

 network 192.168.89.0 mask 255.255.255.0

 dns-list 114.114.114.114

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dhcp server ip-pool vlan91

 gateway-list 192.168.91.254

 network 192.168.91.0 mask 255.255.255.0

 dns-list 114.114.114.114 8.8.8.8

 expired day 0 hour 12

 network 192.168.99.0 mask 255.255.255.0 secondary

  gateway-list 192.168.99.254

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dhcp server ip-pool vlan94

 gateway-list 192.168.94.254

 network 192.168.94.0 mask 255.255.255.0

 dns-list 114.114.114.114 8.8.8.8

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interface NULL0

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interface Vlan-interface1

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interface Vlan-interface88

 description 办公管理

 ip address 192.168.88.254 255.255.255.0

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interface Vlan-interface89

 description 办公管理

 ip address 192.168.89.254 255.255.255.0

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interface Vlan-interface90

 description 监控CCTV

 ip address 192.168.90.254 255.255.255.0

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interface Vlan-interface91

 description 无线-管理

 ip address 192.168.91.254 255.255.255.0

 ip address 192.168.99.254 255.255.255.0 sub

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interface Vlan-interface92

 description 宿舍网络

 ip address 192.168.92.254 255.255.255.0

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interface Vlan-interface93

 description 音响系统

 ip address 192.168.93.254 255.255.255.0

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interface Vlan-interface94

 description AP-注册

 ip address 192.168.94.254 255.255.255.0

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interface Vlan-interface95

 ip address 192.168.95.254 255.255.255.0

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