QoS (CBWFQ) over FR interface

From: mahmoud genidy (ccie.mahmoud@gmail.com)
Date: Thu Dec 04 2008 - 12:16:58 ARST


Hi

I have a QoS scenario over FR link and I'm not sure which way should I go.

The case is as follows.

A Router *R1* with S0/0 configured with FR with two PVC on main interface
(HUB). It is connected with two other routers R2 & R3 over FR as spokes.

The question says: On *R1* Allocate bandwidth as follows:

- % 25 of S0/0 bandwidth for network 10.1.1.0/24
- % 35 of S0/0 bandwidth for network 10.1.2.0/24
- % 30 of S0/0 bandwidth for CRITICAL voice traffic
- Remaining bandwidth is for Class-Default

My questions are:

- When he says *CRITICAL* voice does this mean in the extended ACL to use
precedence 5, or it is not necessary as Voice by default is critical
traffic?

- When he says for example %25 *OF S0/0* does this implies we have to
configure [ maximum-reserved-bandwidth 100 ] ?

- The interface in question is FR with two PVCs. Does this mean we have to
apply the service policy through a FR MAP-CLASS with CIR equals S0?)
bandwidth? Or we can directly apply the service policy on the serial
interface?

- Is it preffered to configure fair-queue for class-default in this case, or
just leave it as it is?

Thanks in advance for your time.

Mahmoud

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