ProCurve 2610-PWR Technical Information download pdf (Page 226)

Quality of Service (QoS): Managing Bandwidth More Effectively

Using QoS Classifiers To Configure QoS for Outbound Traffic

To replace this option with the ToS diff-services option, just configure diff-

services as described below, which automatically disables IP-Precedence. To

disable IP-Precedence without enabling the diff-services option, use this

command:

ProCurve(config)# no qos type-of-service

Assigning an 802.1p Priority to IPv4 Packets on the Basis

of Incoming DSCP

One of the best uses for this option is on an interior switch where you want

to honor (continue) a policy set on an edge switch. That is, it enables you to

select incoming packets having a specific DSCP and forward these packets

with the desired 802.1p priority. For example, if an edge switch “A” marks all

packets received on port A5 with a particular DSCP, you can configure a

downstream (interior) switch “B” to handle such packets with the desired

priority (regardless of whether 802.1Q tagged VLANs are in use).

LAN

Edge

Switch

“A”

LAN

Interior

Switch

“B”

Work-

Group

Work-

Group

Marked Traffic from port A5 on Edge Switch “A”

Other Traffic

Figure 6-15. Interior Switch “B” Honors the Policy Established in Edge Switch “A”

To do so, assign the desired 802.1p priority to the same codepoint that the

upstream or edge switch assigns to the selected packets. When the

downstream switch receives an IPv4 packet carrying one of these codepoints,

it assigns the configured priority to the packet and sends it out the appropriate

priority queue. (The packet retains the codepoint it received from the

upstream or edge switch). You can use this option concurrently with the

diffserv DSCP Policy option (described later in this section), as long as the

DSCPs specified in the two options do not match.

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ProCurve 2610-PWR Technical Information Page 226