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TCAM usage on EX4600

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  • 1.  TCAM usage on EX4600

    Posted 04-18-2019 09:28

    Can someone explain to me tcam usage on the EX4600 platform?  I understand that the available tcam space is split between egress and ingress and how to calculate how much tcam space a particular filter is using.  What I don't get it why my total available tcam space goes up or down based on how many irb's I have defined.



  • 2.  RE: TCAM usage on EX4600

     
    Posted 04-20-2019 20:12


  • 3.  RE: TCAM usage on EX4600
    Best Answer

     
    Posted 04-22-2019 07:53

    Hi lcroce,

     

    TCAM dynamically allocates the minimum number of memory slices required to store the filters for a particular filter type, as needed. This documentation explains this for VLAN filters: 

    https://www.juniper.net/documentation/en_US/junos13.1/topics/concept/filter-scalability-vfp-tcam-understanding.html#jd0e41

     

    Let me know if that answers your query.  

     

    Also, some jargon you'll come across while checking filters for TCAM usage:

    • Port-based ACL (PACL): Ingress and egress
    • VLAN-based ACL (VACL): Ingress and egress
    • Router-based ACL (RACL): Ingress and egress
    • ACL entries (ACE)
    • Ingress filter processor (IFP)
    • Egress filter processor (EFP)
    • VLAN filter processor (VFP)

     

    Hope this helps.

     

    Regards,
    -r.

    --------------------------------------------------

    If this solves your problem, please mark this post as "Accepted Solution."
    Kudos are always appreciated :).



  • 4.  RE: TCAM usage on EX4600

    Posted 04-24-2019 10:27

    Yes, this is what I was looking for.  Thanks.