Enterasys Networks X-PeditionTM manual QoS for Frame Relay Policy

QoS Policy Configuration Examples

XSR(config-pmap-c<class1>)#queue-limit 40

XSR(config-pmap-c<class1>)#exit

XSR(config-pmap<policy1>)#class class2

XSR(config-pmap-c<class2>)#bandwidth 300

XSR(config-pmap-c<class2>)#random-detect 34 56 3

XSR(config-pmap-c<class2>)#exit

XSR(config-pmap<policy1>)#class class-default

XSR(config-pmap-c<class-default>)#queue-limit 20

XSR(config-pmap-c<class-default>)#exit

XSR(config-pmap<policy1>)#exit

Apply the configuration to the interface:

XSR(config)#interface serial 1/1

XSR(config-if<S1/1>)#service-policy output policy1

QoS for Frame Relay Policy

The following example sets Serial interface 1/1 for Frame Relay with one DLCI (100) which will support three types of traffic: voice that is assigned to a priority queue with a bandwidth of 20 kbps, FTP that is assigned to fair queue with 50 percent of the remaining bandwidth, and Class1 that is assigned to class-default (and gets the other 50 percent). DLCI 100 sets CIR at 64 kbps (the sum of all PQs and classes should not exceed the CIR of the DLCI).

When the connection is congested, priority traffic will get its bandwidth share (smaller than the DLCI CIR) while all other classes share the remaining bandwidth proportional to what was requested. Voice is rate limited to 20 Kbps and the interval over which it is enforced is equivalent to burst/bandwidth size (2500 bytes/20 Kbps).

If no burst size is set, default burst size is used. Packets exceeding 20 Kbps are dropped. Class1 and FTP are served after voice gets its share, but split the remaining bandwidth equally.

When there is no congestion each traffic class can use as much bandwidth as is available, except the voice which is priority class and is rate-limited to a maximum of 20 Kbps. BECN will adoptively reduce the CIR of the DLCI but does not influence the parameters of the policy-map frame1.

Begin by creating three ACLs to define traffic classes:

XSR(config)#access-list 101 permit udp 192.168.1.0 0.0.0.255 any eq 3000 XSR(config)#access-list 102 permit tcp 192.168.1.0 0.0.0.255 any eq 3000 XSR(config)#access-list 103 permit ip any any

Create classification maps using a combination of ACLs or IP DSCP or precedence bits to classify packets:

XSR(config)#class-map voice

XSR(config-cmap<voice>)#match access-group 101

XSR(config-cmap<voice>)#exit

XSR(config)#class-map ftp

XSR(config-cmap<ftp>)#match access-group 102

XSR(config-cmap<ftp>)#match ip dscp 18

XSR(config-cmap<ftp>)#match ip dscp 20

XSR(config-cmap<ftp>)#exit

XSR(config)#class-map match-any class-1

XSR(config-cmap<class-1>)#match access-group 103

XSR User’s Guide 12-25