A New Internet-Draft is available from the on-line Internet-Drafts
directories.
Title : ARP Reduction in Data Center
Author(s) : H. Shah
Filename : draft-shah-armd-arp-reduction-00.txt
Pages : 9
Date : 2010-10-18
With advent of virtual machine (VM) technologies, a host is able to
support multiple VMs in a single physical machine. The data center
application leverages these capabilities to instantiate upwards of
10s to 100s of VMs in a server. Each VM operates as an independent
IP host with its own MAC address associated with a virtual Network
Interface Card (vNIC) that maps to a single physical Ethernet
interface. These physical servers are typically stacked in a rack
with its Ethernet interface connected to top-of-the-rack (ToR)
switch. The ToR switches are interconnected through End-of-the-Row
(EoR) switch which in turn is connected to core switches.
As discussed in [ARP-Problem] the VM hosts use ARP broadcasts to
find other VM hosts and use periodic (broadcast) gratuitous ARPs to
refresh their IP to MAC address binding in other VM hosts. Such
broadcasts in a large data center with potentially thousands of VM
hosts in a layer-2 based topology can cause havoc.
This document describes a solution whereby a ToR switch assumes the
handling of the ARP broadcasts based on the ARP table that it
maintains by gleaning information from the passing ARP PDUs. When
the information is not new, gratuitous ARP PDUs are dropped and ARP
broadcast requests from hosts are responded by the switch from the
learned ARP information instead of forwarding them out.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-shah-armd-arp-reduction-00.txt
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