hsrp cisco router, nortel switches (invalid mac address)

[wanyph]

Hi,

Have Nortel Switches in my Network

I have 2 Passports
On each Passport I have 1 Router connected,
The Passports are connected together with a trunk
On the Cisco Routers is HSRP running

Router 1 172.22.254.252
Router 2 172.22.254.253

vitual hsrp adress 172.22.254.254

When I shutdown Router1, Router 2 is becomming active.

But all my clients are getting invalid MAC address of 172.22.254.254

show arp
172.22.254.254 00-00-00-00-00-00

When I turn on router 1 its all working agin.

Is there a problem with cisco + nortel combination?

Please help