07-16-2012 06:52 AM - edited 03-07-2019 07:47 AM
Hey All,
I'm trying wrap my head around bandwidth guarantee for nested maps. I tried adding a new class to two of my policy-maps today, and got this error:
3945E-1(config-pmap-c)#bandwidth 3000
Insufficient bandwidth 3000 kbps for the bandwidth guarantee
I'm not sure how it knows that with the nested maps and how it's computed. I have a 100mb WAN connectin going to 19 branches.
I have a class-map that identifies traffic to the individual branch and within that class, a policy-map is applied to prioritize voice over video etc.
Here's the QoS setup:
class-map Branch1-Policy
match access-group branch-1-acl
*
*
*
class-map Branch-19-Policy
match access-group branch-19-acl
!
!
policy-map Global-branch
class class-default
shape average 100000000
service-policy Branches-NLAN
!
!
policy-map Branches-NLAN
class Branch-1 Policy
shape average 10000000
service-policy Traffic-10calls
*
*
class Branch-19 Policy
shape average 3000000
service-policy Traffic-6calls
!
!
policy-map Traffic-10calls
class VoIP-Control
bandwidth 16
set dscp cs3
class VoIP-Voice
priority 880
set dscp ef
class Symitar
bandwidth 64
set dscp af21
class Video-Conf
set dscp af41
bandwidth 1500
class class-default
fair-queue
queue-limit 128 packets
policy-map Traffic-6calls
class VoIP-Control
bandwidth 16
set dscp cs3
class VoIP-Voice
priority 512
set dscp ef
class Symitar
bandwidth 64
set dscp af21
class Video-Conf
set dscp af41
bandwidth 1500
class class-default
fair-queue
queue-limit 128 packets
I was adding the Video-Conf class to both Traffic-6calls and Traffic-10calls when I got the above error. How would that percentage be calculated? I know by default i can only reserve up to 75% of interface bandwidth.
The platform is 3945E running 15.1(3)
Can someone clarify for me? Thanks!
07-16-2012 10:35 AM
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It's likely your version of IOS will show what it believes each class's bandwidth allocation is. Of interest is your class-default, where you haven't defined any bandwidth. (NB: the 75% rule, I think to which you refer, is pre-HQF.) Don't recall what your IOS version will allocate for class-default, but assume whatever it is, it, along with all your explicitly (non-%) class allocation is exceeding parent shaper's bandwidth allocation.
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