Microsoft KB Archive/278517

= Resource Reservation Setup Protocol Packets Use Local Multicast Address =

PSS ID Number: 278517

Article Last Modified on 10/29/2003

-

The information in this article applies to:


 * Microsoft Windows 2000 Server SP1
 * Microsoft Windows 2000 Advanced Server SP1

-



This article was previously published under Q278517



SUMMARY
Microsoft Windows 2000-based Quality of Service (QoS) clients use the Resource Reservation Setup Protocol (RSVP) protocol to reserve bandwidth. When a Designated Subnet Bandwidth Manager (DSBM) is used to manage a network, RSVP packets are sent from the originating client using a local multicast address, and then DSBM passes the RSVP message to a multicast address.



MORE INFORMATION
RSVP path messages are exchanged between the endpoints of two computers that initiate or maintain a QoS connection. If a DSBM is not present, these path messages are sent as a normal unicast packet.

If a DSBM, such as, Microsoft QoS Admission Control, is present on the subnet of the initiating client, the path message is forwarded to the multicast address &quot;224.0.0.16&quot;. If it does not reject the reservation, DSBM can then pass the RSVP path message to the subnet address &quot;224.0.0.17&quot;.

This process requires a router on the local subnet that can pass the RSVP message onto its next hop to be made RSVP aware. The configuration to listen to RSVP multicasts is specific to the router vendor.

Keywords: kbGQos kbinfo KB278517

Technology: kbwin2000AdvServ kbwin2000AdvServSearch kbWin2000AdvServSP1 kbwin2000Search kbwin2000Serv kbwin2000ServSearch kbwin2000ServSP1 kbWinAdvServSearch

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© 2004 Microsoft Corporation. All rights reserved.