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Introduction
IEEE 802.1p-Based Class of Service for Packet Prioritization
Class of Service (CoS) for packet prioritization allows switch administrators to set priority
levels on the interconnect switch for forwarding packets based on the priority setting
information in the packets. The interconnect switch supports four classes of traffic (buffers or
queues) for implementing priority. The interconnect switch allows administrators to map
eight priority levels to four classes. Traffic from a specific server port can be given priority
over packets from other devices according to this range of priority levels. For example, with
multiple packets in a buffer, the packet with the highest priority would be forwarded first,
regardless of when it was received.
Internet Group Management Protocol Snooping
Internet Group Management Protocol (IGMP) snooping, when enabled and configured
properly, manages multicast traffic in a switch module by allowing directed switching of the
IP multicast traffic. The interconnect switch can use IGMP snooping to configure switch
module ports dynamically, so that IP multicast traffic is forwarded only to those ports
associated with IP multicast hosts.
IGMP snooping allows the switch module to recognize IGMP queries and reports sent
between network stations or devices and an IGMP host that belongs to a specific multicast
group. When enabled for IGMP snooping, the switch module can open or close a port to a
specific device based on IGMP messages passing through the module. This feature further
limits unnecessary broadcasts. The GbE Interconnect Switch can be configured to use either
IGMP version 1 or version 2 when making queries
Dynamic Host Configuration Protocol or Bootstrap Protocol
A switch module can be configured to obtain an IP address from a Dynamic Host
Configuration Protocol (DHCP) or Bootstrap Protocol (BOOTP) server during the boot
process. By default, the interconnect switch is configured for DHCP. The IP settings can be
manually configured through the console interface. The IP settings are also configurable from
other interfaces, such as the Web, but since the connection is based on an IP address for these
interfaces, users have to reconnect with the newly assigned IP address.
1-8 HP ProLiant BL e-Class C-GbE Interconnect Switch User Guide
HP CONFIDENTIAL Codename: DeLorean Part Number: 263682-002 Last Saved On: 2/5/03 10:39 AM