Hi I need some assitance with setting up routing on a 6224F.

the switch is configured as follows:

!Current Configuration:
!System Description "PowerConnect 6224F, 2.2.0.3, VxWorks5.5.1"
!System Software Version 2.2.0.3
!
configure
stack
member 1 3
exit
ip address 172.21.8.225 255.255.248.0
ip default-gateway 172.21.8.1
ip routing
username "admin" password a0932705e05082a005709220f2e92b73 level 15 encrypted
!
interface ethernet 1/g21
mode dvlan-tunnel
exit
exit

I would like to configure the switch to route traffic destined for (172.21.16.0 / 20 and 172.21.128 / 19)  through int eth 1/g21 which is connected to a router with i.p (10.1.1.1 / 30 ) via a fiber optic link.As well as all traffic comming from 1/g21 should be seen as coming from those two subnetts.  I would also like that should the fibre link go down for what ever reason the packets should be routed with the remaining trafic to the default gateway  which is a second router that has an ip address 172.21.8.1 and is connected to the WAN/cloud.

As I have figured it I should:

1) change the management vlan as VLAN 1 cannot be routed by default

2) reassign I.P Address 172.21.8.225 / 21 to VLAN 1

3) create 2nd VLAN and attach to Int Eth 1/g21 and assign I.P 10.1.1.2 / 30

4) Configure Static Routes:

ip route 172.21.16.0 255.255.240.0 10.1.1.1 1   (Single Hop )

ip route 172.21.16.0 255.255.240.0 172.21.8.1 6 ( Six Hops )

ip route 172.21.128.0 255.255.224.0 10.1.1.1 1 (Single Hop )

ip route 172.21.128.0 255.255.224.0 172.21.8.1 6 ( Six Hops )

ip route 0.0.0.0 0.0.0.0 172.21.8.1  (default route to replace default gateway )