DNS issue

[sivagnanam1986]

HI,

i had configured DHCP on Cisco 4507r and this my local DNS server 10.19.26.225, when the server is down the secondary DNS ip is not getting in my  Client PC.

Thanks

ip dhcp pool lwap_v99
 network 10.1.1.0 255.255.255.0
 default-router 10.1.1.254
 dns-server 10.19.26.225 8.8.8.8 103.12.45.26
 

[shaps]

verify that the client PC has picked up both DNS servers,  it should have both entries.  if it doesnt then it can never use the secondary one you have configured on the cisco