10-06-2010 08:45 PM - edited 03-06-2019 01:22 PM
Hi Guru's.
Cisco 7609S running 12.2(33)SRE2
Im running a traffic gen to simulate a bit of remarking on the backbone. I want to remark incoming traffic and then overload it to ensure its dropped on the backbone link. What im finding is that the default class behaviour when trying to match on EXP value, is to match on topmost. Even if i dont include the "topmost" command. Does this mean i need to set topmost too?
I cant seem to see the dropped traffic on the INTER-SITE policy. I suspect the EXP marking is not happening.
Example config.
class-map match-any EF
match ip dscp ef
match mpls experimental topmost 2
class-map match-any REMARK-EF
match ip dscp af21
class-map match-any AF
match ip dscp cs2
match mpls experimental topmost 1
class-map match-any NC
description Network Control
match ip dscp cs6
match mpls experimental topmost 6
policy-map INTER-SITE
class NC
bandwidth percent 1
class EF
police rate percent 10 burst 5 ms
conform-action transmit
exceed-action drop
priority
class Signalling
bandwidth percent 1
class AF
bandwidth percent 70
class class-default
random-detect
random-detect precedence 0 20 40
policy-map REMARK
class REMARK-EF
set dscp ef
set mpls experimental imposition 2
class class-default
set dscp af12
set mpls experimental imposition 1
10-07-2010 12:45 AM
Hi,
I'm not sure where you are using your route-maps exactly, but
shouldn't you use
set mpls experimental topmost ...
instead of
set mpls experimental imposition ...
in your policy-map REMARK
?
HTH,
Milan
10-13-2010 08:25 PM
Hi,
Thanks for the response. Actually the "topmost" match command is the default option, cannot change this. On the 7609-S running 12.2(33)SRE1 when we specify a match command for EXP, it always seems to change the command to "topmost" but does not do this when setting the EXP.
To cut a long story short, no you dont necessarily have to remark as topmost.
I found the issue and it was a simple one. I embarrassingly forgot to include the "mls qos" command globally. After which, all the issues were solved and all the marking is working fine.
Thanks to everyone for their kind assistance.
10-13-2010 10:12 AM
Can you present your complete topology?.
10-13-2010 08:26 PM
Issue resolved.
Turns out i forgot to include the "mls qos" command globally. Now the config works great.
Thanks a lot for your responses.
BR//
Chanuka
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