HP 9304M - Manual (Page 12)

HP ProCurve Routing Switch 9308M / 9304M Reviewer’s Guide
switched ports is at wire speed, since it is looked at as Layer 2 traffic that just happens to be AppleTalk
at Layer 3.
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Routing Services
•
Routing Table Maintenance Protocol (RTMP)
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AppleTalk Echo Protocol (AEP)
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Name Binding Protocol (NBP)
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Datagram Delivery Protocol (DDP)
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AppleTalk Address Resolution Protocol (AARP)
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Zone Information Protocol (ZIP)
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AppleTalk-based filters (see the Filter section below)
2.4 QoS
2.4.1 IEEE 802.3x Flow Control
Both HP ProCurve routing switches adhere to the IEEE 802.3x Flow Control specification. This
provides industry standard support for managing heavy port traffic and helps the routing switch avoid
memory buffer overflows. Flow control is enabled on a port-by-port basis. By default, all ports have
flow control enabled on the HP ProCurve routing switches.
2.4.2 IEEE 802.1p Priority Support
IEEE 802.1p packet tagging supports both designation of VLAN membership (see the VLAN section
below) and packet priority (up to 8 levels). The architecture of the HP ProCurve routing switches
support four levels of priority through multiple priority queues each module keeps. See the priority
queue discussion in the previous section for more details on the handling and mapping of the priority
queues. These priority queues allow the 9304M / 9308M to be responsive to time-sensitive applications
that use the priority field in packet tagging.
Priority of packets can be given specific values based on their inbound port, VLAN affiliation or MAC
address. This allows the network manager to better manage the traffic through the switch, giving
priority to packets that contain time-sensitive data without involvement of the end nodes.
The 9300 routing switches can work in concert with the other HP managed switches to provide an end-
to-end QoS solution. The HP desktop and local backbone switches with firmware code C.07.01
2 or later
can use the IP address, VLAN affiliation, or IP/TOS (type of service) field of the packet to set a value
for the 802.1q priority bits. As noted above, the 9300 routing switches can read these bits and prioritize
the packets appropriately through the routing switch. Through the combination of the HP desktop and
local backbone switches, and the 9300 routing switches, packet priorities can be established end-to-end
in the local LAN environment without any end node interaction.
2.4.3 Multicast Support
The routing switches support three areas of multicast packet management, DVMRP, PIM and IGMP.
DVMRP and PIM are routing protocols used to set up the route trees through the network for multicast
groups when multiple routes exist. IGMP is used where there are not multiple paths, such as at Layer 2
or in a single or dual router environment, and can work in conjunction with either DVMRP or PIM,
since these protocols will establish a single path for any one multicast stream. DVMRP and PIM, each
tied to different ports, can run concurrently in the same routing switch.
2.4.3.1 DVMRP
Distance Vector Multicast Routing Protocol (DVMRP) is a protocol similar to RIP in that builds its own
multicast routing table in conjunction with other routers in the network. DVMRP uses this table to
2 Available June 1, 1999. Available for download at no cost to present switch owners.
©1999 Hewlett-Packard Company Revision 4.0 – 4/1/1999 Page: 12 of 27