Carp vhid with vlan id's alignment

[Rafael Ganascim]

1) I had seen the source code, and the doubt was about modifying it to
support 4096 vlans (12 bits)

2) I don't understand this type of implementation. May you explain? How
obtain the fault-tolerance and HA with this? Or load balancing?

Thanks!

2011/6/20 Alexander V. Chernikov <melifaro at ipfw.ru>

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> Rafael Ganascim wrote:
> > Hi list,
> >
> > I'm planning and testing a new FreeBSD router, with vlans and carp
> > interfaces. There are a lot of vlans, with high vlan IDs. We have, for
> > example:
> >
> > dot1q vlan id: 1530
> >
> > Iface igb0
> >  vlan1530
> >   carp1530
> >    vhid 10
> >
> > What do you think in change the carp code to support vhid above 255 (just
> to
> > align with vlanid, carp vlan name)? I think that it can ease the
> > troubleshooting, standardization and documentation (in this scenario).
> It's
> > the last piece of the complete 'id' alignment.
> 1) CARP packet format uses 8bit for VHID (see sys/netinet/ip_carp.h for
> packet format)
>
> 2) Making carp instance for every vlan is (generally) wrong design.
> Making single carp instance for group of interfaces (and
> creating/deleting vlans depending carp instance state) is more
> preferable in most cases. You can get state change events for carp(4)
> interfaces via devd(8).
>
> Moreover, every carp instance sends multicast packets every 1 second +
> several milliseconds in default scenario. This means a lot of multicast
> traffic in case of many instances which can confuse other devices (or
> another carp implementations like ucarp).
>
> >
> > But I don't know the impact of this change in the source codes (and
> related,
> > like the ifconfig).
> >
> > What do you think?
> >
> >
> > Regards,
> >
> > Rafael
> > _______________________________________________
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