QoS Question: I have more "match" statements than a single class-map will allow. How do I nest?

[reichmann@enerflex.com]

Running 3850 with IOSXE 16.9.1 at IPServices licensing.  All kinds of documentation show nesting of Class-Maps inside of Class-Maps.  But that option is not available at the command line (Lord their is A LOT of different, conflicting and aged documentation on this subject on the Cisco web site!!).  How do I list more than the allowed 16 "match" statements under a single QoS class-map?  Where can I nest?  Nesting of Policy Maps also does not appear to be available.

[paul driver]

Hello

You can apply hierarchical policies with nested class-maps, meaning you have a child and parent policy-maps

Example
class-map 1
match ip dscp xx

class-map 2
match class 1

policy-map child
class 2
priority xxx
class class-default
fair queue

policy-map parent
class class-default
shape average xxxx
service-policy child

int x/x
service policy output parent

[reichmann@enerflex.com]

Hey Paul,

Thanks for the prompt reply.

The first part of your answer solves my problem perfectly.

class-map 1
match ip dscp xx

class-map 2
match class 1

You are nesting class-maps.  I have read about this exact capability.

Except, as I mentioned, this option is not available to me.  To use your example, when I go to create class-map 2, the options available to me are as follows (copied, pasted and redacted right out of the console session of my 3850 switch)

sw1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
sw1(config)#class-map match-any 2     <---using your example
sw1(config-cmap)#match ?

access-group Access group
cos IEEE 802.1Q/ISL class of service/user priority values
dscp Match DSCP in IPv4 and IPv6 packets
group-object Match object-group
ip IP specific values
mpls Multi Protocol Label Switching specific values
precedence Match Precedence in IPv4 and IPv6 packets
protocol Protocol
qos-group Qos-group
vlan VLANs to match

sw1(config-cmap)#match 

Note the list.  There is no option to enter class-map.

My response to your second option will be in my next post.

Thanks.

[mkazam001]

Hi,

Here's a link to an awesome book on Cisco QoS by Odom Wendell.

Really cheap if you buy second-hand!

Regards,

Azam