Re: Arps and grat arps was (RE: tsv-dir review ofdraft-ietf-vrrp-unified-spec-02.txt)

Do they sniff MAC addresses in ARP packets? I didn't know that
was legal.

The source MAC address in the ARP packet's MAC header must always
be the physical MAC address of the system, of course, never the
VR MAC address. I've only ever heard of switches learning based
on the source MAC address *in* the MAC header. Am I about to have
a learning experience?
-don
  -----Original Message-----
  From: [email protected] [mailto:[email protected]]On Behalf Of Mark Handley
  Sent: Tuesday, November 04, 2008 12:36 PM
  To: don provan
  Cc: Stephen Nadas; TSV Dir; vrrp
  Subject: Re: [VRRP] Arps and grat arps was (RE: tsv-dir review ofdraft-ietf-vrrp-unified-spec-02.txt)





  On Tue, Nov 4, 2008 at 7:27 PM, don provan <[email protected]> wrote:


    But it doesn't really matter: all routers *can* send gratuitous
    ARP messages for the VR. The VR ARP information is constant: it
    does not change when the VRRP master changes. No black hole would
    be created: all the entries map the VR IP address to the VR MAC
    address. The current master is the node that receives all packets
    sent to the VR MAC address no matter what node actually distributed
    the VR ARP mapping.

  Won't you blackhole the traffic if you do this on a LAN composed of MAC-learning switches?

   - Mark

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