Cisco 7100 Series Spezifikationen PDF herunterladen (Seite 40)

Step 2—Configuring Quality of Service

Cisco 7100 Series VPN Configuration Guide

3-10

Conﬁguring Weighted Fair Queuing

WFQprovidestrafﬁcpriority management thatautomatically sorts among individualtrafﬁc

streams without requiring that you ﬁrst deﬁne access lists. WFQ can also manage duplex

data streams such as those between pairs of applications, and simplex data streams such as

voice or video. There are two categories of WFQ sessions: high bandwidth and low

bandwidth. Low-bandwidth trafﬁc has effective priority over high-bandwidth trafﬁc, and

high-bandwidthtrafﬁcshares the transmission service proportionally according to assigned

weights.

When WFQ is enabled for an interface, new messages for high-bandwidth trafﬁc streams

are discarded after the conﬁgured or default congestive messages threshold has been met.

However, low-bandwidth conversations, which include control message conversations,

continue to enqueue data. As a result, the fair queue may occasionally contain more

messages than its conﬁgured threshold number speciﬁes.

With standard WFQ, packets are classiﬁed by ﬂow. Packets with the same source IP

address, destination IP address, source Transmission Control Protocol (TCP) or User

Datagram Protocol (UDP) port, or destination TCP or UDP port belong to the same ﬂow.

WFQ allocates an equal share of the bandwidth to each ﬂow. Flow-based WFQ is also

called fair queuing because all ﬂows are equally weighted.

To conﬁgure fair queuing on an interface, complete the following steps starting in global

conﬁguration mode:

Step Command Purpose

hq-sanjose(config)# interface serial 1/0

Specify an interface and enter interface

conﬁguration mode. This example speciﬁes serial

interface 1/0 on the headquarters router.

hq-sanjose(config-if)# fair-queue

Conﬁgure fair queuing on the interface.

hq-sanjose(config-if)# exit

hq-sanjose(config)#

Exit back to global conﬁguration mode.

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Cisco 7100 Series Spezifikationen Seite 40