Cisco 1700 series Configurazione - Pagina 21

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interface Virtual-Template1

bandwidth 320

ip unnumbered Loopback1

ip mroute-cache

service-policy output 1751_ADSL

ppp multilink

ppp multilink fragment-delay 4

ppp multilink interleave

access-list 100 permit udp any any precedence critical

Weighted Random Early Detection

You can set a queuing technique on a device's interface to manage how packets are handled when an

interface starts to become congested. The queuing technique available for congestion avoidance is called

weighted random early detection (WRED). WRED is IP precedence and differentiated services code

point (DSCP) value aware.

WRED allows the interface to start dropping packets from selected flows when traffic begins to exceed

the interface's traffic thresholds, but before congestion occurs. If the dropped packets are TCP packets,

the TCP source recognizes that packets are being dropped, and then lowers its transmission rate. The

lowered transmission rate reduces the traffic to the interface, thus avoiding congestion. Because TCP

retransmits dropped packets, no actual data loss occurs.

WRED parameters cannot be configured on a physical ATM interface or the VC-bundle level. You must

Note

create one or more WRED parameter groups and then attach the parameter group to each PVC. By using

this method, you can apply the same WRED settings to multiple PVCs without needing to configure each

PVC and maximum packet limit. The bandwidth assigned to a class is the guaranteed bandwidth

delivered to the class during congestion.

Configuration Example

The following example shows a Cisco 1751 configured with WRED:

random-detect-group 1751_DSL

exponential-weighting-constant 5

precedence 2 96 256 100

precedence 5 192 256 100

interface ATM0/0

mtu 1000

no ip address

atm vc-per-vp 256

no atm ilmi-keepalive

pvc 0/16 ilmi

bundle-enable

dsl operating-mode auto

interface ATM0/0.1 point-to-point

description configuring limi manage in pvc brings down the atm protocol

mtu 4000

ip address 1.0.0.1 255.0.0.0

pvc 88/88

random-detect attach 1751_DSL

protocol ip 2.0.0.2

OL-3317-03

Configuring an ADSL WAN Interface Card on Cisco 1700 Series Routers

Configuring Quality of Service Parameters