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i have a pair of 4500x in VSS with 950x SVI and 6x BGP peers with no full tables (there is no other configs) now i want to configure 4-5x GRE tunnel and and 1-2x gre tunnel will have around 500mbps traffic and left of them are backup gre and i may apply pbr and tcp mss adjust for some interface, so i want to know can i safely run these features or they impact so much on my switch performance? also does 4500x support IP tcp mss adjust ? thanks,

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PBR is supported in hardware on the 4500X so long as your policy routes fit within the available TCAM.

GRE is supported in hardware.

I believe TCP MSS Adjust is supported as well.

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  • so all of them are supported in hardware? do you know if tcp mss supported in hardware or not ? thus when pbr and gre supported in hardware i should except no performance issue right? – Blackmetal Nov 23 '20 at 13:19
  • I think TCP MSS Adjust is in hardware but a quick search didn't turn up any solid information one way or the other. – Jeff Wheeler Nov 23 '20 at 14:00

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