Explain me what adding VHID for every IP would make the CARP traffic very noisy

[davide]

Please,
someone can explain me what exactly means "adding a VHID for every IP would make the CARP traffic very noisy"

Thank you very much.

[mimugmail]

A multicast packet per second per carp. Thats why you can add an alias and link to carp vhid

[davide]

Thank you very much for the explanation, now I have a more clear idea of what means traffic noisy. :-)

I understand that If I use IP Alias for the 2nd IP I need to setup this IP Alias manually also on the failover router.
If I setup IP Alias on the same VHID Group of the CARP address my configuration is still in high availability?

Box1:
Carp IP=8.8.8.8 VHID Group=1
IP Alias=8.8.8.9 VHID Group=2

Box2:
Carp IP=8.8.8.8 VHID Group=1
IP Alias=8.8.8.9 VHID Group=2

If Box1 dies I can still reach both 8.8.8.8 and 8.8.8.9 just like using two CARP IP?

Thanks

[mimugmail]

No, alias needs to be in same group, otherwise it wont make sense. Sync of alias should already be done automatically I guess