VRRP Version 3 Implementation

[saravanan.narasimhan]

Hi,

I have a doubt on VRRP version 3. Version 3 introduces the concept of "Accept" mode.

Is "Accept" Mode restricted only for IPv6 Addresses?

If so, why?

Can anyone please clarify?

Thanks,

Saravanan Narasimhan

[Rashid Thompson]

No, Accept mode works for IPv4 as well. Please see explaination below

Accept_Mode                 Controls whether a virtual router in
                               Master state will accept packets
                               addressed to the address owner's IPvX
                               address as its own if it is not the IPvX
                               address owner.  The default is False.
                               Deployments that rely on, for example,
                               pinging the address owner's IPvX address
                               may wish to configure Accept_Mode to
                               True.

                               Note: IPv6 Neighbor Solicitations and
                               Neighbor Advertisements MUST NOT be
                               dropped when Accept_Mode is False.

[saravanan.narasimhan]

Hi,

As per the VRRPv3 MIB RFC 6527,

       vrrpv3OperationsAcceptMode OBJECT-TYPE
           SYNTAX       TruthValue
           MAX-ACCESS   read-create
           STATUS       current
           DESCRIPTION
              "Controls whether a virtual router in master state
              will accept packets addressed to the address owner's
              IPv6 address as its own if it is not the IPv6 address
              owner.  Default is false(2).
              This object is not relevant for rows representing VRRP
              over IPv4 and should be set to false(2)."
           DEFVAL       { false }
           ::= { vrrpv3OperationsEntry 11 }

According to this MIB object, it looks like "Accept_Mode" is only applicable for IPv6 and not for IPv4.

What is the understanding behind having this restriction in MIB?

Can you please explain?

Thanks,

Saravanan Narasimhan

[Rashid Thompson]

My guess would be that this MIB has some conflicting information on the internet. I suggest testing this in a lab just to be sure