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New Member

Cisco ASR 1002- performance issue due to access list


We are planning to implement inbound access-list to block subnets from particular country. Since the subnets are not contiguous, we have about 16000 lines of acl entries.

I want to know, would there be any performance or latency issues after applying 16k lines of acl?

Is there a good document where I can read more about ACL limitations and performance issues on ASR.

This is for ASR1002, running IOS-XE 15.3(1)S1.




Super Bronze

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Sorry, I don't know the answer to your questions, but I'm writing to mention a 7200 feature, that if supported on the ASR, might help in your situation.  See

New Member

Hi,I don't know if a 16K acl


I don't know if a 16K acl is supported on ASR1002 platform, but since you mention that you want to filter whole subnets, I would suggest to blackhole them, by routing them to null on your ASR. 16K routes to null are not that much and are definitely supported without impact.