You'll need to be more specific (more words) on what you're trying to accomplish.
"fix bandwidth on priority basis" isn't something I can immediately understand what you're trying to do.
I can outline a few scenarios that may help:
CBFWQ - this gives each class of traffic a guaranteed minimum bandwidth in case of congestion.
LLQ - CBWFQ plus one class that is strict priority that always gets processed first - normally used for voice.
Less used methods:
Priority queueing: This gives strict priority to each of 4 different classes over one another. With this system any time there is a higher priority class, it will be forwarded before all lower classes. This is a legacy method, and isn't suggested because you can 'starve' lower classes.
RSVP - this does hop by hop end-to-end signaling to reserve a certain bandwidth for each class. With this system you could make sure you're not going to drop packets. This is also a huge pain to configure, and you will have a very, very hard time troubleshooting this.
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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