[c-nsp] ATM SPA and SIP-200 QoS

[MKS]

Hi list

Can someone give me an reasonable answer why the he*# cisco has to make
every product different and out-of-sync with each other.

E.g. migrating from c720x ATM cards to c7600 ATM SPA has become some pain.
What I need to achieve is the QoS per vc for point-to-point subinterfaces.

e.g.

from
http://www.cisco.com/en/US/products/hw/routers/ps368/module_installation_and_configuration_guides_chapter09186a008021ff16.html#wp1262692

The following restrictions apply to the operation of QoS on the ATM SPAs:
–The ATM SPAs do not support bandwidth-limited priority queueing, but
support only strict *priority* policy maps (that is, the priority command
without any parameters).
–A maximum of one *priority* command is supported in a policy map.

These restriction really cripple the QoS available on the ATM SPAs. The
policy-map options that i'm left with are: (please correct me if I'm wrong)

policy-map QoS_1
 class Voice
  priority
 class BusinessCritical
  bandwidth remaining percent 25
 class RealTime
  bandwidth remaining percent 25
 class class-default

With this map only Voice is given priority, since the "bandwidth remaining
percent 25" command only divides the unallocated bandwidth to the two
categories and doesn't allocate a minimum bandwidth to each category.
(note it's not possible to use the "bandwidth" command, I only get the
following error "bandwidth kbps/percent command cannot co-exist with strict
priority in the same policy-map")

or

policy-map QoS_2
 class Voice
  bandwidth 512
 class BusinessCritical
  bandwidth 512
 class RealTime
  bandwidth 512

With this map I obviously don't have any priority for Voice just minimum
bandwidth reserved.


1) Will this restriction be fixed in some later software? (I have tried SRA
and SRB/SRB1, not SRC)
2) Are there any better workarounds than I list here?

Regards MKS