Access point cannot ping its default gateway and in its ARP cache for default gateway I see this:
#sh arp
Address Age (min) Hardware Addr
10.20.30.1 0 FF:FF:FF:FF:FF:FF
is it correct logic for ARP cache ?
no it is not,
this is the broadcast address, not the gateways mac address
so it indicates it cannot ARP the gateways address
how does this AP gets its IP-configuration? if it's DHCP check the scope settings, if fixed check the AP's config
in both cases check if the address/subnet mask matches that configured on the gateway
IP, subnet, default gateway configured statically as capwap parameters and they are correct