Frame-Relay Traffic Shaping example using point-to-point sub-interfaces

admin_2 · ‎06-24-2002

I have a hub and spoke frame-relay network using 3640 router at the Hub running 12.2.5a and 2612 at the San Jose remote running 12.0(19). This is a partially meshed network as many of the remote spokes have access to the 2612 San Jose spoke via PVC's nailed down by AT&T to give the other remotes access to internet via the San Jose 2612 site. I have the following configurations:

---central 3640 router------

cisco45-1#sho run int s0/0.1

interface Serial0/0.1 point-to-point

description San Jose Frame Relay

bandwidth 256

ip address 10.1.100.1 255.255.255.248

ipx input-sap-filter 1001

ipx network A164FC

ipx output-sap-filter 1001

frame-relay class PORT256CIR128

frame-relay interface-dlci 110

!

map-class frame-relay PORT256CIR128

frame-relay traffic-rate 128000 256000

---remote--2612 router ---------

SanJose2612#sho run int s0/1.1

interface Serial0/1.1 point-to-point

ip address 10.1.100.2 255.255.255.248

no ip directed-broadcast

ipx input-sap-filter 1001

ipx network A164FC

ipx output-sap-filter 1001

frame-relay class PORT256CIR128

frame-relay interface-dlci 100

!

map-class frame-relay PORT256CIR128

frame-relay traffic-rate 128000 256000

no frame-relay adaptive-shaping

I have questions:

1) The above config will make the router reduce the output of the subinterface to CIR when it receives BECN. Is that a correct statement? What is the formula that it trotles back and forth at? In other words is it a single BECN that makes it throttle back and what makes it climb back to bursting at portspeed.

2) Is there a better example of configuring this that would produce better results. I See examples like this one the web site.

-------------------------

map-class frame-relay cisco

frame-relay cir 64000

frame-relay mincir 32000

frame-relay bc 8000

frame-relay be 16000

Can you give a text example on how I would configure my example using the MINCIR, BC and BE like the web example above? And, is it better or just more granular?

3) I want to configure a DE list along with traffic shaping that would make IPX SAPs and www traffic low priority and mark them DE.Can you give a text example of that?

Report Inappropriate Content · ‎06-24-2002

From above, I see you have no frame-relay adptive shaping

under the map class. That would mean disregard FECN or BECN.

To answer you other question.

If you want to do frame-relay traffic shapiing on a per dlci(point-to-point)

sub interface, then you need to first creat a map-class for frame-relay.

map-class frame-relay SHAPING_RULE

frame-relay CIR 256000

frame-relay bc x (=256 if voice will flow over tis link)

frame-relay be y (= 0 if voice will flow over thislink)

frame-relay fair-queue

no frame-relay adptive-shaping

!

interface serial 0

encapsulation frame-relay

frame-relay traffic-shaping

!

interface serial 0.2 point

ip address x.x.x.x 255.255.255.252

frame-relay interface-dlci 100

class SHAPING_RULE

Now each sub-interface will use the map-class attached to it and would

shape based on the context of the map-class statement.

CIR is 256K but would allow a burst size of x if its within a

given tc time interval. If be is set, it would allow

burst to size of be set after CIR but those traffic will

not be guranteed and are liable to be droped in the network. Also

the map-class for the dlci would not respond or react to any BECN or FECN.

Use a diiferent map-class per dlci if the parameters are different or use the same map-class if they are. Also do the same thing on the spoke as well as hub.